tienen - ¿Cómo simular el efecto de lente ojo de pez por openCV?

quitar efecto ojo de pez photoshop

Question

Estoy buscando maneras de crear efecto de lente ojo de pez, miré documentaciones para openCV, parece que contiene funciones de calibración de cámara para distorsiones radiales como ojo de pez. ¿Es posible simular la distorsión de ojo de pez por openCV?

Si es posible hacerlo mediante openCV, comparando con OpenGL, ¿cuál generará mejores resultados? Gracias.

Answer 1

Creé esta aplicación usando opencv. ¿Es este el efecto al que te refieres? Básicamente codifiqué la fórmula que se muestra en la wikipedia "Distorsión (óptica)". Puedo mostrar el código si es necesario.

Actualización : OK, a continuación se muestra el código escrito en c ++ usando opencv (no documentado, así que no dude en pedir explicaciones): El programa recibe como entrada el siguiente parámetro: | imagen de entrada | | imagen de salida | | K, que controla la cantidad de distorsión (por lo general, prueba con valores de alrededor de 0.001) | | x coordenada del centro de distorsión | | y coordenada del centro de distorsión |

Entonces, el quid del programa es el bucle doble que itera píxel por píxel en la imagen resultante y busca el píxel coincidente en la imagen de entrada usando la fórmula de distorsión radial (esta es la forma en que generalmente se hace la deformación de la imagen, tal vez contra intuitivamente por retroproyección de salida a entrada). Hay algunas sutilezas que tienen que ver con la escala de la imagen de salida (en este programa, la imagen resultante es del mismo tamaño que la entrada), y no entraré en ella a menos que desee entrar en más detalles. Disfrute.

    #include <cv.h>
    #include <highgui.h>
    #include <math.h>
    #include <unistd.h>
    #include <getopt.h>
    #include <iostream>


    void sampleImage(const IplImage* arr, float idx0, float idx1, CvScalar& res)
    {
      if(idx0<0 || idx1<0 || idx0>(cvGetSize(arr).height-1) || idx1>(cvGetSize(arr).width-1)){
        res.val[0]=0;
        res.val[1]=0;
        res.val[2]=0;
        res.val[3]=0;
        return;
      }
      float idx0_fl=floor(idx0);
      float idx0_cl=ceil(idx0);
      float idx1_fl=floor(idx1);
      float idx1_cl=ceil(idx1);

      CvScalar s1=cvGet2D(arr,(int)idx0_fl,(int)idx1_fl);
      CvScalar s2=cvGet2D(arr,(int)idx0_fl,(int)idx1_cl);
      CvScalar s3=cvGet2D(arr,(int)idx0_cl,(int)idx1_cl);
      CvScalar s4=cvGet2D(arr,(int)idx0_cl,(int)idx1_fl);
      float x = idx0 - idx0_fl;
      float y = idx1 - idx1_fl;
      res.val[0]= s1.val[0]*(1-x)*(1-y) + s2.val[0]*(1-x)*y + s3.val[0]*x*y + s4.val[0]*x*(1-y);
      res.val[1]= s1.val[1]*(1-x)*(1-y) + s2.val[1]*(1-x)*y + s3.val[1]*x*y + s4.val[1]*x*(1-y);
      res.val[2]= s1.val[2]*(1-x)*(1-y) + s2.val[2]*(1-x)*y + s3.val[2]*x*y + s4.val[2]*x*(1-y);
      res.val[3]= s1.val[3]*(1-x)*(1-y) + s2.val[3]*(1-x)*y + s3.val[3]*x*y + s4.val[3]*x*(1-y);
    }

    float xscale;
    float yscale;
    float xshift;
    float yshift;

    float getRadialX(float x,float y,float cx,float cy,float k){
      x = (x*xscale+xshift);
      y = (y*yscale+yshift);
      float res = x+((x-cx)*k*((x-cx)*(x-cx)+(y-cy)*(y-cy)));
      return res;
    }

    float getRadialY(float x,float y,float cx,float cy,float k){
      x = (x*xscale+xshift);
      y = (y*yscale+yshift);
      float res = y+((y-cy)*k*((x-cx)*(x-cx)+(y-cy)*(y-cy)));
      return res;
    }

    float thresh = 1;
    float calc_shift(float x1,float x2,float cx,float k){
      float x3 = x1+(x2-x1)*0.5;
      float res1 = x1+((x1-cx)*k*((x1-cx)*(x1-cx)));
      float res3 = x3+((x3-cx)*k*((x3-cx)*(x3-cx)));

      //  std::cerr<<"x1: "<<x1<<" - "<<res1<<" x3: "<<x3<<" - "<<res3<<std::endl;

      if(res1>-thresh and res1 < thresh)
        return x1;
      if(res3<0){
        return calc_shift(x3,x2,cx,k);
      }
      else{
        return calc_shift(x1,x3,cx,k);
      }
    }

    int main(int argc, char** argv)
    {
      IplImage* src = cvLoadImage( argv[1], 1 );
      IplImage* dst = cvCreateImage(cvGetSize(src),src->depth,src->nChannels);
      IplImage* dst2 = cvCreateImage(cvGetSize(src),src->depth,src->nChannels);
      float K=atof(argv[3]);
      float centerX=atoi(argv[4]);
      float centerY=atoi(argv[5]);
      int width = cvGetSize(src).width;
      int height = cvGetSize(src).height;

      xshift = calc_shift(0,centerX-1,centerX,K);
      float newcenterX = width-centerX;
      float xshift_2 = calc_shift(0,newcenterX-1,newcenterX,K);

      yshift = calc_shift(0,centerY-1,centerY,K);
      float newcenterY = height-centerY;
      float yshift_2 = calc_shift(0,newcenterY-1,newcenterY,K);
      //  scale = (centerX-xshift)/centerX;
      xscale = (width-xshift-xshift_2)/width;
      yscale = (height-yshift-yshift_2)/height;

      std::cerr<<xshift<<" "<<yshift<<" "<<xscale<<" "<<yscale<<std::endl;
      std::cerr<<cvGetSize(src).height<<std::endl;
      std::cerr<<cvGetSize(src).width<<std::endl;

      for(int j=0;j<cvGetSize(dst).height;j++){
        for(int i=0;i<cvGetSize(dst).width;i++){
          CvScalar s;
          float x = getRadialX((float)i,(float)j,centerX,centerY,K);
          float y = getRadialY((float)i,(float)j,centerX,centerY,K);
          sampleImage(src,y,x,s);
          cvSet2D(dst,j,i,s);

        }
      }
    #if 0
      cvNamedWindow( "Source1", 1 );
      cvShowImage( "Source1", dst);
      cvWaitKey(0);
    #endif

      cvSaveImage(argv[2],dst,0);

    #if 0
      for(int j=0;j<cvGetSize(src).height;j++){
        for(int i=0;i<cvGetSize(src).width;i++){
          CvScalar s;
          sampleImage(src,j+0.25,i+0.25,s);
          cvSet2D(dst,j,i,s);
        }
      }

      cvNamedWindow( "Source1", 1 );
      cvShowImage( "Source1", src);
      cvWaitKey(0);

    #endif  

}

Answer 2

Depuré los archivos java y funciona bien en mis teléfonos (superior a 4.0). Consiste en 3 archivos java y 1 archivo xml. Tienes que colocar el archivo checkerboardback.jpg en el directorio draailable. Como alguien dijo, faltaba el valor alfa y le di "0x0ff". Además, el límite superior de algunos Looping estaba mal.

// 1. MultiRuntimeProcessorFilter.java

public class MultiRuntimeProcessorFilter {



private static final String TAG = "mrpf";
private int x = 0;
private Bitmap input = null;
private int radius;
private int mHeight;


public void createBitmapSections(int nOp, int[] sections){

    int processors = nOp;
    int jMax = input.getHeight();
    int aSectionSize = (int) Math.ceil(jMax/processors);
    Log.e("yoSIZECHK", "++++++++++ sections size = "+aSectionSize);

    int k = 0;
    for(int h=0; h<processors+1; h++){

            sections[h] = k;
            k+= aSectionSize;
            if(h==processors){
                sections[h] = mHeight;//Last must cover ceiling
            }
        Log.v("yoSEC","sections = "+h+" "+sections[h]);

    }
}// end of createBitmapSections()


//@SuppressWarnings("unchecked")
public Bitmap barrel (Bitmap input, float k, int r){
      this.radius = r;
      this.input = input;
      int []mArray = new int[input.getWidth()*input.getHeight()];

      mHeight = input.getHeight();
      Log.e(TAG, "bitmap height x width = "+mHeight+" "+input.getWidth());
  //Log.v("yoRESULT", "height width = "+ input.getWidth()+" "+input.getHeight());




      int nrOfProcessors = Runtime.getRuntime().availableProcessors();
      Log.e(TAG, "no of processors = "+nrOfProcessors);


      int[] sections = new int[nrOfProcessors+1];


      createBitmapSections(nrOfProcessors,sections);
      ExecutorService threadPool = Executors.newFixedThreadPool(nrOfProcessors);

      for(int g=0; g<sections.length;g++){
          Log.e(TAG, "++++++++++ sections= "+sections[g]);
      }

  // ExecutorService threadPool = Executors.newFixedThreadPool(nrOfProcessors);

      Object[] task = new Object[nrOfProcessors];

      for(int z = 0; z < nrOfProcessors; z++){
         task[z]  = (FutureTask<PartialResult>) threadPool.submit(new PartialProcessing(sections[z], sections[z+1] - 1, input, k, z));
         Log.e(TAG, "++++++++++ task"+z+"= "+task[z].toString()); 
      }

     PartialResult[] results = new PartialResult[nrOfProcessors];

     try{
          for(int t = 0; t < nrOfProcessors; t++){

              results[t] = ((FutureTask<PartialResult>) task[t]).get();

              results[t].fill(mArray);
          }

      }catch(Exception e){
          e.printStackTrace();
      }

 Log.v("yoRESULT", "height width = "+ input.getHeight()+" "+input.getWidth());
      Bitmap dst2 = Bitmap.createBitmap(mArray,input.getWidth(),input.getHeight(),input.getConfig());

    return dst2;


    }//end of barrel()




public class PartialResult {
       int startP;
       int endP;
       int[] storedValues;

       public PartialResult(int startp, int endp, Bitmap input){

           this.startP = startp;
           this.endP = endp;
           this.storedValues = new int[input.getWidth()*input.getHeight()];


       }

       public void addValue(int p, int result) {
             storedValues[p] = result;

       }

       public void fill(int[] mArray) {

           Log.v("yo09", startP + " " + endP + " " + input.getWidth());
           //yoko for (int p = startP; p < endP; p++){
       for (int p = startP; p < endP+1; p++){
               //for(int b=0;b<radius;b++,x++)
              for(int b=0;b<input.getWidth();b++,x++) {
                  mArray[x] = storedValues[x];
                  if (b == 0) Log.v("yoyoyo", p+" + " + storedValues[x]);
              }
          } 
          Log.e("yoFill", " ++++++++++ radius x = "+radius+" "+x);
   }

       }//end of partialResult




public class PartialProcessing implements Callable<PartialResult> {
    int startJ;
    int endJ;
    int mID;


    private int[] scalar;
    private float xscale;
    private float yscale;
    private float xshift;
    private float yshift;
    private float thresh = 1;
    private int [] s1;
    private int [] s2;
    private int [] s3;
    private int [] s4;
    private int [] s;
    private Bitmap input;
    private float k;



    public PartialProcessing(int startj, int endj, Bitmap input, float k, int mID) {

        this.startJ = startj;
        this.endJ = endj;
        this.input = input;
        this.k = k;
        this.mID = mID;

        s = new int[4];
        scalar = new int[4];
        s1 = new int[4];
        s2 = new int[4];
        s3 = new int[4];
        s4 = new int[4];

    }

    int [] getARGB(Bitmap buf,int x, int y){

        int rgb = buf.getPixel(y, x); // Returns by default ARGB.
        // int [] scalar = new int[4];
       //  scalar[0] = (rgb >>> 24) & 0xFF;
         scalar[1] = (rgb >>> 16) & 0xFF;
         scalar[2] = (rgb >>> 8) & 0xFF;
         scalar[3] = (rgb >>> 0) & 0xFF;
         return scalar;

    }



    float getRadialX(float x,float y,float cx,float cy,float k){

        x = (x*xscale+xshift);
        y = (y*yscale+yshift);
        float res = x+((x-cx)*k*((x-cx)*(x-cx)+(y-cy)*(y-cy)));
        return res;
      }

      float getRadialY(float x,float y,float cx,float cy,float k){

        x = (x*xscale+xshift);
        y = (y*yscale+yshift);
        float res = y+((y-cy)*k*((x-cx)*(x-cx)+(y-cy)*(y-cy)));
        return res;
      }



      float calc_shift(float x1,float x2,float cx,float k){

        float x3 = (float)(x1+(x2-x1)*0.5);
        float res1 = x1+((x1-cx)*k*((x1-cx)*(x1-cx)));
        float res3 = x3+((x3-cx)*k*((x3-cx)*(x3-cx)));

        if(res1>-thresh && res1 < thresh)
          return x1;
        if(res3<0){
          return calc_shift(x3,x2,cx,k);
        }
        else{
          return calc_shift(x1,x3,cx,k);
        }
      }


      //void sampleImage(Bitmap mArray, float idx0, float idx1)
    int [] sampleImage(Bitmap mArray2, float idx0, float idx1)
      {

         // s = new int [4];
        if(idx0<0 || idx1<0 || idx0>(mArray2.getHeight()-1) || idx1>(mArray2.getWidth()-1)){
          s[0]=0;
          s[1]=0;
          s[2]=0;
          s[3]=0;
          return s;// yoko
        }

        float idx0_fl=(float) Math.floor(idx0);
        float idx0_cl=(float) Math.ceil(idx0);
        float idx1_fl=(float) Math.floor(idx1);
        float idx1_cl=(float) Math.ceil(idx1);



    s1 = getARGB(mArray2,(int)idx0_fl,(int)idx1_fl);
    s2 = getARGB(mArray2,(int)idx0_fl,(int)idx1_cl);
    s3 = getARGB(mArray2,(int)idx0_cl,(int)idx1_cl);
    s4 = getARGB(mArray2,(int)idx0_cl,(int)idx1_fl);

        float x = idx0 - idx0_fl;
        float y = idx1 - idx1_fl;

       // s[0]= (int) (s1[0]*(1-x)*(1-y) + s2[0]*(1-x)*y + s3[0]*x*y + s4[0]*x*(1-y));
        s[1]= (int) (s1[1]*(1-x)*(1-y) + s2[1]*(1-x)*y + s3[1]*x*y + s4[1]*x*(1-y));
        s[2]= (int) (s1[2]*(1-x)*(1-y) + s2[2]*(1-x)*y + s3[2]*x*y + s4[2]*x*(1-y));
        s[3]= (int) (s1[3]*(1-x)*(1-y) + s2[3]*(1-x)*y + s3[3]*x*y + s4[3]*x*(1-y));

          return s;

      }



    @Override
    public PartialResult call() {

         PartialResult partialResult = new PartialResult(startJ, endJ,input);

         float centerX=input.getWidth()/2; //center of distortion
         float centerY=input.getHeight()/2;



         int width = input.getWidth(); //image bounds
         int height = input.getHeight();



          xshift = calc_shift(0,centerX-1,centerX,k);

          float newcenterX = width-centerX;
          float xshift_2 = calc_shift(0,newcenterX-1,newcenterX,k);

          yshift = calc_shift(0,centerY-1,centerY,k);

          float newcenterY = height-centerY;
          float yshift_2 = calc_shift(0,newcenterY-1,newcenterY,k);

          xscale = (width-xshift-xshift_2)/width;

          yscale = (height-yshift-yshift_2)/height;


        // yoko int p = startJ*radius;
        int p = startJ*width;//yoko
        int origPixel = 0;
        int color = 0;
        int i;

    Log.v("yokoIJ","PartialResult startJ endJ "+startJ+"  "+endJ);
        //yoko for (int j = startJ; j <  endJ; j++){
        for (int j = startJ; j <  endJ+1; j++){
            for ( i = 0; i < width; i++, p++){
    s = new int [4];//yoko added

    origPixel = input.getPixel(i,j);

    float x = getRadialX((float)j,(float)i,centerX,centerY,k);
    float y = getRadialY((float)j,(float)i,centerX,centerY,k);
    //sampleImage(input,x,y); //yoko
    s= sampleImage(input,x,y);

    color = (0xff<<24)|((s[1]&0x0ff)<<16)|((s[2]&0x0ff)<<8)|(s[3]&0x0ff);
    //Log.e(TAG, "radius = "+radius);

     //Not understand why it is not radius but radius/2
         //yoko if(((i-centerX)*(i-centerX) + (j-centerY)*(j-centerY)) <= radius*(radius/4)){
    if(((i-centerX)*(i-centerX) + (j-centerY)*(j-centerY)) <= radius*radius){
                //yo if(j%10 == 1 && i%10 == 1)
                    //yo Log.v("yoJI", mID+" "+j + " " + i );
        partialResult.addValue(p, color);
    }else{
        partialResult.addValue(p, origPixel);
        }

            }//end of inner for

    }//end of outer for

        return partialResult;
}//end of call
}// end of partialprocessing
}//end of MultiProcesorFilter

// 2. Filters.java:

class Filters{
float xscale;
float yscale;
float xshift;
float yshift;
int [] s;
private static String TAG = "Filters";
public Filters(){
    Log.e(TAG, "***********inside constructor");
}

public Bitmap barrel (Bitmap input, float k, boolean check, int Range){
    Log.e(TAG, "***********inside barrel method : hasAlpha = ");
    float centerX=input.getWidth()/2; //center of distortion
    float centerY=input.getHeight()/2;

    int width = input.getWidth(); //image bounds
    int height = input.getHeight();

//yoko        Log.v("yoQQ", width+" "+height+" "+centerX+" "+centerY);
    if(check)return input;

    Bitmap dst = Bitmap.createBitmap(width, height,input.getConfig() ); //output pic
    Log.e(TAG, "***********dst bitmap created ");
      xshift = calc_shift(0,centerX-1,centerX,k);
      float newcenterX = width-centerX;

    float xshift_2 = calc_shift(0,newcenterX-1,newcenterX,k);
      yshift = calc_shift(0,centerY-1,centerY,k);
      float newcenterY = height-centerY;
      float yshift_2 = calc_shift(0,newcenterY-1,newcenterY,k);

      xscale = (width-xshift-xshift_2)/width;
      yscale = (height-yshift-yshift_2)/height;
      Log.e(TAG, "***********about to loop through bm");
  Log.v("yoQQ2", xscale + " " + yscale);
  //if(check==1)return input;//yoko
      /*for(int j=0;j<dst.getHeight();j++){
          for(int i=0;i<dst.getWidth();i++){
            float x = getRadialX((float)i,(float)j,centerX,centerY,k);
            float y = getRadialY((float)i,(float)j,centerX,centerY,k);
            sampleImage(input,x,y);
            int color = ((s[1]&0x0ff)<<16)|((s[2]&0x0ff)<<8)|(s[3]&0x0ff);
//            System.out.print(i+" "+j+" //");

            dst.setPixel(i, j, color);

          }
        }*/

      int origPixel; // the pixel in orig image
      int i=0,j=0;
      for(j=0;j<dst.getHeight();j++){
          for(i=0;i<dst.getWidth();i++){
            s = new int [4];//yoko added
             origPixel= input.getPixel(i,j);
            float x = getRadialX((float)i,(float)j,centerX,centerY,k);
            float y = getRadialY((float)i,(float)j,centerX,centerY,k);
            //yoko sampleImage(input,x,y);
            s = sampleImage(input,x,y);
            //yoko int color = ((s[1]&0x0ff)<<16)|((s[2]&0x0ff)<<8)|(s[3]&0x0ff);
            int color = (0xff<<24)|((s[1]&0xff)<<16)|((s[2]&0xff)<<8)|(s[3]&0xff);
            //Log.v("yoQQ3", j + " " + i + " : "+dst.getHeight()+" "+dst.getWidth());


    // check whether a pixel is within the circle bounds of 150

            if( Math.sqrt( Math.pow(i - centerX, 2) + ( Math.pow(j - centerY, 2) ) ) <= Range ){
        dst.setPixel(i, j, color);
                //if(j%10 == 1 && i%10 == 1)
                //    Log.v("yoJI", j + " " + i );
            }else{
                dst.setPixel(i,j,origPixel);
            }
          }
        }
    Log.v("yoDONE", "========  Loop End ======== "+j+" "+i+" : " + dst.getHeight()+" "+dst.getWidth());
    return dst;
}//barrel

//    void sampleImage(Bitmap arr, float idx0, float idx1) // yoko
int[] sampleImage(Bitmap arr, float idx0, float idx1)
{
    s = new int [4];
  if(idx0<0 || idx1<0 || idx0>(arr.getHeight()-1) || idx1>(arr.getWidth()-1)){
    s[0]=0;
    s[1]=0;
    s[2]=0;
    s[3]=0;
    return s;
  }

  float idx0_fl=(float) Math.floor(idx0);
  float idx0_cl=(float) Math.ceil(idx0);
  float idx1_fl=(float) Math.floor(idx1);
  float idx1_cl=(float) Math.ceil(idx1);

  int [] s1 = getARGB(arr,(int)idx0_fl,(int)idx1_fl);
  int [] s2 = getARGB(arr,(int)idx0_fl,(int)idx1_cl);
  int [] s3 = getARGB(arr,(int)idx0_cl,(int)idx1_cl);
  int [] s4 = getARGB(arr,(int)idx0_cl,(int)idx1_fl);

  float x = idx0 - idx0_fl;
  float y = idx1 - idx1_fl;

  s[0]= (int) (s1[0]*(1-x)*(1-y) + s2[0]*(1-x)*y + s3[0]*x*y + s4[0]*x*(1-y));
  s[1]= (int) (s1[1]*(1-x)*(1-y) + s2[1]*(1-x)*y + s3[1]*x*y + s4[1]*x*(1-y));
  s[2]= (int) (s1[2]*(1-x)*(1-y) + s2[2]*(1-x)*y + s3[2]*x*y + s4[2]*x*(1-y));
  s[3]= (int) (s1[3]*(1-x)*(1-y) + s2[3]*(1-x)*y + s3[3]*x*y + s4[3]*x*(1-y));
  return s;///yoko added to make return the result value
}//sampleImage

int [] getARGB(Bitmap buf,int x, int y){
    int rgb = buf.getPixel(y, x); // Returns by default ARGB.
    int [] scalar = new int[4];
    scalar[0] = (rgb >>> 24) & 0xFF;
    scalar[1] = (rgb >>> 16) & 0xFF;
    scalar[2] = (rgb >>> 8) & 0xFF;
    scalar[3] = (rgb >>> 0) & 0xFF;
    return scalar;
}//getARGB

float getRadialX(float x,float y,float cx,float cy,float k){
  x = (x*xscale+xshift);
  y = (y*yscale+yshift);
  float res = x+((x-cx)*k*((x-cx)*(x-cx)+(y-cy)*(y-cy)));
  return res;
}//getRadial1X

float getRadialY(float x,float y,float cx,float cy,float k){
  x = (x*xscale+xshift);
  y = (y*yscale+yshift);
  float res = y+((y-cy)*k*((x-cx)*(x-cx)+(y-cy)*(y-cy)));
  return res;
}//getRadialY

float thresh = 1;

float calc_shift(float x1,float x2,float cx,float k){
  float x3 = (float)(x1+(x2-x1)*0.5);
  float res1 = x1+((x1-cx)*k*((x1-cx)*(x1-cx)));
  float res3 = x3+((x3-cx)*k*((x3-cx)*(x3-cx)));

  if(res1>-thresh && res1 < thresh)
    return x1;
  if(res3<0){
    return calc_shift(x3,x2,cx,k);
  }
  else{
    return calc_shift(x1,x3,cx,k);
  }
}//calc_shift
}

Y // 3 MainActivity.java, clase de nivel superior.

public class MainActivity extends Activity {

ImageView iv1=null;
ImageView iv2=null;
Button bT, bB, b0;
Bitmap bitmap1, bitmap2, bitmapSP;
Boolean view1 = true;
private static final String TAG = "*********jjil";
public static int mH,mW,RADIUS;

@Override 
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);

    setContentView(R.layout.activity_main);

    Resources res = this.getResources();
    //bitmap1 = BitmapFactory.decodeResource(res, R.drawable.checkerboard);
    bitmap1 = BitmapFactory.decodeResource(res, R.drawable.checkerboardback);
    mH=bitmap1.getHeight();
    mW=bitmap1.getWidth();
    RADIUS = mH/3;

    bT = (Button)findViewById(R.id.buttontoggle);
    bT.setOnClickListener(onClickToggleView);
    bB = (Button)findViewById(R.id.buttonbarrel);
    bB.setOnClickListener(onClickToggleView);
    b0 = (Button)findViewById(R.id.button0);
    b0.setOnClickListener(onClickToggleView);

    iv1=(ImageView)findViewById(R.id.touchview1);
    iv1.setImageBitmap(bitmap1);
    iv1.setVisibility(View.VISIBLE);


}//end of oncreate

public View.OnClickListener onClickToggleView = new View.OnClickListener() {
    public void onClick(View v) {
        if (v == bT) {

    /// fromhere
            new AsyncTask<Void, Void, String>() {
                com.example.owner.opengl2.Filters mFilers = new com.example.owner.opengl2.Filters();
                TextView tx = (TextView)findViewById(R.id.mStatus);
                Bitmap bitmapSP;long start,end;

                protected void onPreExecute() {
                    start = System.nanoTime();
                    iv1.setImageBitmap(bitmap1);
                    tx.setText("- Running -");
                }

                protected String doInBackground(Void... params) {
                     bitmapSP = mFilers.barrel(bitmap1,(float)0.00005,false,RADIUS);
                    return "message";
                }

                protected void onPostExecute(String msg) {
                    end = System.nanoTime();
                    long elapsedTime = end - start;
                    long seconds = elapsedTime / 1000000;

                    iv1.setImageBitmap(bitmapSP);
                    tx.setText("- READY : ElapsedTime(ms) = "+seconds);
                    // Post Code
                    // Use `msg` in code
                }
            }.execute();
    ///upto here



        } else if (v == bB){

    /// fromhere
            new AsyncTask<Void, Void, String>() {
                com.example.owner.opengl2.MultiRuntimeProcessorFilter mFilers = new com.example.owner.opengl2.MultiRuntimeProcessorFilter();
                TextView tx = (TextView)findViewById(R.id.mStatus);
                Bitmap bitmapSP;long start,end;

                protected void onPreExecute() {
                    start = System.nanoTime();
                    iv1.setImageBitmap(bitmap1);
                    tx.setText("- Running -");
                }

                protected String doInBackground(Void... params) {
                    bitmapSP = mFilers.barrel(bitmap1,(float)0.00005,RADIUS);
                    return "message";
                }

                protected void onPostExecute(String msg) {
                    end = System.nanoTime();
                    long elapsedTime = end - start;
                    //double seconds = (double)elapsedTime / 1000000000.0;
                    long seconds = elapsedTime / 1000000;
                    iv1.setImageBitmap(bitmapSP);
                    tx.setText("- READY : ElapsedTime(ms) = "+seconds);
                    // Post Code
                    // Use `msg` in code
                }
            }.execute();


        } else if (v == b0){
            new AsyncTask<Void, Void, String>() {
                protected String doInBackground(Void... Unused) {
                    return "OK";
                }
                protected void onPostExecute(String message) {
                    Log.v("YO", "---------------------------------");
                    Log.v("YO", "----------ORIGINAL SHAPE-------- "+message);
                    Log.v("YO", "---------------------------------");
                    iv1.setImageBitmap(bitmap1);

                    TextView tx = (TextView)findViewById(R.id.mStatus);
                    tx.setText("- READY : w h RADIUS = "+mW+" "+mH+" "+RADIUS);
                }
            }.execute();

        }
        ///upto here

    }
};

}

Aquí está el archivo XML // 4 activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

<LinearLayout
    android:id="@+id/buttons"
    android:layout_centerHorizontal="true"
    android:layout_alignParentTop="true"
    android:orientation="horizontal"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <Button
        android:id="@+id/buttontoggle"
        android:text="Barrel 1P"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <Button
    android:id="@+id/buttonbarrel"
    android:text="Barrele NP"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

    <Button
        android:id="@+id/button0"
        android:text="ORIGINAL"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />


</LinearLayout>
<TextView
    android:id="@+id/mStatus"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text=" - Ready - "
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:layout_below="@+id/buttons"
    android:layout_centerHorizontal="true"
    />

<ImageView
    android:id="@+id/touchview1"
    android:layout_below="@+id/mStatus"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_centerHorizontal="true"
     />

<!--ImageView
    android:id="@+id/touchview2"
    android:layout_below="@+id/touchview1"
    android:layout_alignParentBottom="true"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_centerHorizontal="true" /-->

Answer 3

Gracias a los 2 anteriores para este código. Modifiqué el código transcrito anterior en Java para usar mapas de bits en lugar de BufferedImage. Esto permite que el código se ejecute en Android (que no admite AWT). También hice que el efecto solo manipulara los píxeles en un círculo en lugar de todo el mapa de bits, esto le da un efecto ojo de pez. Espera que esto ayude a cualquier desarrollador de Android.

import android.graphics.Bitmap;
import android.util.Log;

class Filters{
    float xscale;
    float yscale;
    float xshift;
    float yshift;
    int [] s;
    private String TAG = "Filters";
    public Filters(){

        Log.e(TAG, "***********inside constructor");
    }

    public Bitmap barrel (Bitmap input, float k){
        Log.e(TAG, "***********inside barrel method ");
        float centerX=input.getWidth()/2; //center of distortion
        float centerY=input.getHeight()/2;

        int width = input.getWidth(); //image bounds
        int height = input.getHeight();

        Bitmap dst = Bitmap.createBitmap(width, height,input.getConfig() ); //output pic
        Log.e(TAG, "***********dst bitmap created ");
          xshift = calc_shift(0,centerX-1,centerX,k);
          float newcenterX = width-centerX;
          float xshift_2 = calc_shift(0,newcenterX-1,newcenterX,k);

          yshift = calc_shift(0,centerY-1,centerY,k);
          float newcenterY = height-centerY;
          float yshift_2 = calc_shift(0,newcenterY-1,newcenterY,k);

          xscale = (width-xshift-xshift_2)/width;
          yscale = (height-yshift-yshift_2)/height;
          Log.e(TAG, "***********about to loop through bm");
          /*for(int j=0;j<dst.getHeight();j++){
              for(int i=0;i<dst.getWidth();i++){
                float x = getRadialX((float)i,(float)j,centerX,centerY,k);
                float y = getRadialY((float)i,(float)j,centerX,centerY,k);
                sampleImage(input,x,y);
                int color = ((s[1]&0x0ff)<<16)|((s[2]&0x0ff)<<8)|(s[3]&0x0ff);
    //            System.out.print(i+" "+j+" //");

                dst.setPixel(i, j, color);

              }
            }*/

          int origPixel; // the pixel in orig image

          for(int j=0;j<dst.getHeight();j++){
              for(int i=0;i<dst.getWidth();i++){
                 origPixel= input.getPixel(i,j);
                float x = getRadialX((float)i,(float)j,centerX,centerY,k);
                float y = getRadialY((float)i,(float)j,centerX,centerY,k);
                sampleImage(input,x,y);
                int color = ((s[1]&0x0ff)<<16)|((s[2]&0x0ff)<<8)|(s[3]&0x0ff);
    //            System.out.print(i+" "+j+" //");


// check whether a pixel is within the circle bounds of 150

                if( Math.sqrt( Math.pow(i - centerX, 2) + ( Math.pow(j - centerY, 2) ) ) <= 150 ){
                dst.setPixel(i, j, color);
                }else{
                    dst.setPixel(i,j,origPixel);
                }
              }
            }
        return dst;
    }

    void sampleImage(Bitmap arr, float idx0, float idx1)
    {
        s = new int [4];
      if(idx0<0 || idx1<0 || idx0>(arr.getHeight()-1) || idx1>(arr.getWidth()-1)){
        s[0]=0;
        s[1]=0;
        s[2]=0;
        s[3]=0;
        return;
      }

      float idx0_fl=(float) Math.floor(idx0);
      float idx0_cl=(float) Math.ceil(idx0);
      float idx1_fl=(float) Math.floor(idx1);
      float idx1_cl=(float) Math.ceil(idx1);

      int [] s1 = getARGB(arr,(int)idx0_fl,(int)idx1_fl);
      int [] s2 = getARGB(arr,(int)idx0_fl,(int)idx1_cl);
      int [] s3 = getARGB(arr,(int)idx0_cl,(int)idx1_cl);
      int [] s4 = getARGB(arr,(int)idx0_cl,(int)idx1_fl);

      float x = idx0 - idx0_fl;
      float y = idx1 - idx1_fl;

      s[0]= (int) (s1[0]*(1-x)*(1-y) + s2[0]*(1-x)*y + s3[0]*x*y + s4[0]*x*(1-y));
      s[1]= (int) (s1[1]*(1-x)*(1-y) + s2[1]*(1-x)*y + s3[1]*x*y + s4[1]*x*(1-y));
      s[2]= (int) (s1[2]*(1-x)*(1-y) + s2[2]*(1-x)*y + s3[2]*x*y + s4[2]*x*(1-y));
      s[3]= (int) (s1[3]*(1-x)*(1-y) + s2[3]*(1-x)*y + s3[3]*x*y + s4[3]*x*(1-y));
    }

    int [] getARGB(Bitmap buf,int x, int y){
        int rgb = buf.getPixel(y, x); // Returns by default ARGB.
        int [] scalar = new int[4];
        scalar[0] = (rgb >>> 24) & 0xFF;
        scalar[1] = (rgb >>> 16) & 0xFF;
        scalar[2] = (rgb >>> 8) & 0xFF;
        scalar[3] = (rgb >>> 0) & 0xFF;
        return scalar;
    }

    float getRadialX(float x,float y,float cx,float cy,float k){
      x = (x*xscale+xshift);
      y = (y*yscale+yshift);
      float res = x+((x-cx)*k*((x-cx)*(x-cx)+(y-cy)*(y-cy)));
      return res;
    }

    float getRadialY(float x,float y,float cx,float cy,float k){
      x = (x*xscale+xshift);
      y = (y*yscale+yshift);
      float res = y+((y-cy)*k*((x-cx)*(x-cx)+(y-cy)*(y-cy)));
      return res;
    }

    float thresh = 1;

    float calc_shift(float x1,float x2,float cx,float k){
      float x3 = (float)(x1+(x2-x1)*0.5);
      float res1 = x1+((x1-cx)*k*((x1-cx)*(x1-cx)));
      float res3 = x3+((x3-cx)*k*((x3-cx)*(x3-cx)));

      if(res1>-thresh && res1 < thresh)
        return x1;
      if(res3<0){
        return calc_shift(x3,x2,cx,k);
      }
      else{
        return calc_shift(x1,x3,cx,k);
      }
    }
}

.

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.FutureTask;

import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.os.Debug;
import android.util.Log;

public class MultiRuntimeProcessorFilter {



    private static final String TAG = "mrpf";
    private int x = 0;
    private Bitmap input = null;
    private int radius;


    public void createBitmapSections(int nOp, int[] sections){

        int processors = nOp;
        int jMax = input.getHeight();
        int aSectionSize = (int) Math.ceil(jMax/processors);
        Log.e(TAG, "++++++++++ sections size = "+aSectionSize);


        int k = 0;
        for(int h=0; h<processors+1; h++){

                sections[h] = k;
                k+= aSectionSize;



        }
    }// end of createBitmapSections()



    @SuppressWarnings("unchecked")
    public Bitmap barrel (Bitmap input, float k, int r){
          this.radius = r;
          this.input = input;
          int []arr = new int[input.getWidth()*input.getHeight()];


          Log.e(TAG, "bitmap height = "+input.getHeight()); 




          int nrOfProcessors = Runtime.getRuntime().availableProcessors();
          Log.e(TAG, "no of processors = "+nrOfProcessors);

          int[] sections = new int[nrOfProcessors+1];


          createBitmapSections(nrOfProcessors,sections);
          ExecutorService threadPool = Executors.newFixedThreadPool(nrOfProcessors);

          for(int g=0; g<sections.length;g++){
              Log.e(TAG, "++++++++++ sections= "+sections[g]);
          }

         // ExecutorService threadPool = Executors.newFixedThreadPool(nrOfProcessors);

          Object[] task = new Object[nrOfProcessors];

          for(int z = 0; z < nrOfProcessors; z++){
             task[z]  = (FutureTask<PartialResult>) threadPool.submit(new PartialProcessing(sections[z], sections[z+1] - 1, input, k));  
             Log.e(TAG, "++++++++++ task"+z+"= "+task[z].toString()); 
          }

         PartialResult[] results = new PartialResult[nrOfProcessors];

         try{
              for(int t = 0; t < nrOfProcessors; t++){

                  results[t] = ((FutureTask<PartialResult>) task[t]).get();

                  results[t].fill(arr);
              }

          }catch(Exception e){
              e.printStackTrace();
          }

          Bitmap dst2 = Bitmap.createBitmap(arr,input.getWidth(),input.getHeight(),input.getConfig());


        return dst2;


        }//end of barrel()




    public class PartialResult {
           int startP;
           int endP;
           int[] storedValues;

           public PartialResult(int startp, int endp, Bitmap input){

               this.startP = startp;
               this.endP = endp;
               this.storedValues = new int[input.getWidth()*input.getHeight()];


           }

           public void addValue(int p, int result) {
                 storedValues[p] = result;

           }

           public void fill(int[] arr) {



              for (int p = startP; p < endP; p++){
                  for(int b=0;b<radius;b++,x++)
                 arr[x] = storedValues[x];

              } 
              Log.e(TAG, "++++++++++ x ="+x);
              }

           }//end of partialResult




    public class PartialProcessing implements Callable<PartialResult> {
        int startJ;
        int endJ;


        private int[] scalar;
        private float xscale;
        private float yscale;
        private float xshift;
        private float yshift;
        private float thresh = 1;
        private int [] s1;
        private int [] s2;
        private int [] s3;
        private int [] s4;
        private int [] s;
        private Bitmap input;
        private float k;



        public PartialProcessing(int startj, int endj, Bitmap input, float k) {

            this.startJ = startj;
            this.endJ = endj;
            this.input = input;
            this.k = k;

            s = new int[4];
            scalar = new int[4];
            s1 = new int[4];
            s2 = new int[4];
            s3 = new int[4];
            s4 = new int[4];

        }

        int [] getARGB(Bitmap buf,int x, int y){

            int rgb = buf.getPixel(y, x); // Returns by default ARGB.
            // int [] scalar = new int[4];
           //  scalar[0] = (rgb >>> 24) & 0xFF;
             scalar[1] = (rgb >>> 16) & 0xFF;
             scalar[2] = (rgb >>> 8) & 0xFF;
             scalar[3] = (rgb >>> 0) & 0xFF;
             return scalar;

        }



        float getRadialX(float x,float y,float cx,float cy,float k){

            x = (x*xscale+xshift);
            y = (y*yscale+yshift);
            float res = x+((x-cx)*k*((x-cx)*(x-cx)+(y-cy)*(y-cy)));
            return res;
          }

          float getRadialY(float x,float y,float cx,float cy,float k){

            x = (x*xscale+xshift);
            y = (y*yscale+yshift);
            float res = y+((y-cy)*k*((x-cx)*(x-cx)+(y-cy)*(y-cy)));
            return res;
          }



          float calc_shift(float x1,float x2,float cx,float k){

            float x3 = (float)(x1+(x2-x1)*0.5);
            float res1 = x1+((x1-cx)*k*((x1-cx)*(x1-cx)));
            float res3 = x3+((x3-cx)*k*((x3-cx)*(x3-cx)));

            if(res1>-thresh && res1 < thresh)
              return x1;
            if(res3<0){
              return calc_shift(x3,x2,cx,k);
            }
            else{
              return calc_shift(x1,x3,cx,k);
            }
          }


          void sampleImage(Bitmap arr, float idx0, float idx1)
          {

             // s = new int [4];
            if(idx0<0 || idx1<0 || idx0>(arr.getHeight()-1) || idx1>(arr.getWidth()-1)){
              s[0]=0;
              s[1]=0;
              s[2]=0;
              s[3]=0;
              return;
            }

            float idx0_fl=(float) Math.floor(idx0);
            float idx0_cl=(float) Math.ceil(idx0);
            float idx1_fl=(float) Math.floor(idx1);
            float idx1_cl=(float) Math.ceil(idx1);



             s1 = getARGB(arr,(int)idx0_fl,(int)idx1_fl);
             s2 = getARGB(arr,(int)idx0_fl,(int)idx1_cl);
             s3 = getARGB(arr,(int)idx0_cl,(int)idx1_cl);
             s4 = getARGB(arr,(int)idx0_cl,(int)idx1_fl);

            float x = idx0 - idx0_fl;
            float y = idx1 - idx1_fl;

           // s[0]= (int) (s1[0]*(1-x)*(1-y) + s2[0]*(1-x)*y + s3[0]*x*y + s4[0]*x*(1-y));
            s[1]= (int) (s1[1]*(1-x)*(1-y) + s2[1]*(1-x)*y + s3[1]*x*y + s4[1]*x*(1-y));
            s[2]= (int) (s1[2]*(1-x)*(1-y) + s2[2]*(1-x)*y + s3[2]*x*y + s4[2]*x*(1-y));
            s[3]= (int) (s1[3]*(1-x)*(1-y) + s2[3]*(1-x)*y + s3[3]*x*y + s4[3]*x*(1-y));


          }



        @Override public PartialResult call() { 

             PartialResult partialResult = new PartialResult(startJ, endJ,input);

             float centerX=input.getWidth()/2; //center of distortion
             float centerY=input.getHeight()/2;



             int width = input.getWidth(); //image bounds
             int height = input.getHeight();



              xshift = calc_shift(0,centerX-1,centerX,k);

              float newcenterX = width-centerX;
              float xshift_2 = calc_shift(0,newcenterX-1,newcenterX,k);

              yshift = calc_shift(0,centerY-1,centerY,k);

              float newcenterY = height-centerY;
              float yshift_2 = calc_shift(0,newcenterY-1,newcenterY,k);

              xscale = (width-xshift-xshift_2)/width;

              yscale = (height-yshift-yshift_2)/height;


            int p = startJ*radius; 
            int origPixel = 0;
            int color = 0;
            int i;

            for (int j = startJ; j <  endJ; j++){

                for ( i = 0; i < width; i++, p++){


             origPixel = input.getPixel(i,j);

             float x = getRadialX((float)j,(float)i,centerX,centerY,k);


             float y = getRadialY((float)j,(float)i,centerX,centerY,k);

             sampleImage(input,x,y);

             color = ((s[1]&0x0ff)<<16)|((s[2]&0x0ff)<<8)|(s[3]&0x0ff);
            //Log.e(TAG, "radius = "+radius);

             if(((i-centerX)*(i-centerX) + (j-centerY)*(j-centerY)) <= radius*(radius/4)){

                                 partialResult.addValue(p, color);


            }else{


                partialResult.addValue(p, origPixel);



            }

                }//end of inner for

        }//end of outer for

            return partialResult;
    }//end of call


}// end of partialprocessing

}//end of MultiProcesorFilter

@And_Dev como se prometió

A continuación se muestra la vista que hace que los usuarios toquen los co-ords y luego llamen al filtro en un área seleccionada. el área seleccionada es el cordón, por ejemplo, el centro del círculo más un radio (un círculo). el código lo hace dos veces como para una aplicación de aumento mamario :) Simplemente comente el código de HorizontalSlider ya que no lo necesita.

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.os.Environment;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;

import com.tecmark.HorizontalSlider.OnProgressChangeListener;

public class TouchView extends View{


    private File tempFile;
    private byte[] imageArray;
    private Bitmap bgr;

    private Bitmap crop;
    private Bitmap crop2;
    private Bitmap overLay;
    private Bitmap overLay2;


    private float centreX;
    private float centreY;
    private float centreA = 200;
    private float centreB = 200;
    private Boolean xyFound = false;
    private int Progress = 1;
    private static final String TAG = "*********TouchView";
    private Filters f = null;
    private boolean bothCirclesInPlace = false;
    private MultiProcessorFilter mpf;
    private MultiProcessorFilter mpf2;
    private MultiRuntimeProcessorFilter mrpf;
    private MultiRuntimeProcessorFilter mrpf2;





    public TouchView(Context context) {
        super(context);

    }




    public TouchView(Context context, AttributeSet attr) {
        super(context,attr);
        Log.e(TAG, "++++++++++ inside touchview constructor");



        tempFile = new File(Environment.getExternalStorageDirectory().
                getAbsolutePath() + "/"+"image.jpg");

        imageArray = new byte[(int)tempFile.length()];


     try{

            InputStream is = new FileInputStream(tempFile);
            BufferedInputStream bis = new BufferedInputStream(is);
            DataInputStream dis = new DataInputStream(bis);


            int i = 0;

            while (dis.available() > 0) {
            imageArray[i] = dis.readByte();
            i++;
            }

            dis.close();

       } catch (Exception e) {

               e.printStackTrace();
            }


       Bitmap bm = BitmapFactory.decodeByteArray(imageArray, 0, imageArray.length);




        bgr = bm.copy(bm.getConfig(), true);;

        overLay = null;
        overLay2 = null;



       bm.recycle();

    }// end of touchView constructor




    public void findCirclePixels(){ 

         //  f = new Filters();
         //  mpf = new MultiProcessorFilter();
         //  mpf2 = new MultiProcessorFilter();
         mrpf = new MultiRuntimeProcessorFilter();
         mrpf2 = new MultiRuntimeProcessorFilter();

         crop = Bitmap.createBitmap(bgr,Math.max((int)centreX-75,0),Math.max((int)centreY-75,0),150,150);
         crop2 = Bitmap.createBitmap(bgr,Math.max((int)centreA-75,0),Math.max((int)centreB-75,0),150,150);

              new Thread(new Runnable() {
                public void run() {
                    float prog = (float)Progress/150001;

               // final Bitmap bgr3 = f.barrel(crop,prog);
               // final Bitmap bgr4 = f.barrel(crop2,prog);

              //  final Bitmap bgr3 = mpf.barrel(crop,prog);
              //  final Bitmap bgr4 = mpf2.barrel(crop2,prog);

                    final Bitmap bgr3 = mrpf.barrel(crop,prog);
                    final Bitmap bgr4 = mrpf2.barrel(crop2,prog);

                  TouchView.this.post(new Runnable() {
                    public void run() {


                      TouchView.this.overLay = bgr3;
                      TouchView.this.overLay2 = bgr4;

                      TouchView.this.invalidate();

                    }
                  });
                }
              }).start();


        }// end of changePixel()






    @Override
    public boolean onTouchEvent(MotionEvent ev) {

        switch (ev.getAction()) {

            case MotionEvent.ACTION_DOWN: {

                if(xyFound == false){
                centreX = (int) ev.getX();
                centreY = (int) ev.getY();
                xyFound = true;
                }else{
                centreA = (int) ev.getX();
                centreB = (int) ev.getY();
                bothCirclesInPlace  = true;
                }


                break;
            }

          /*  case MotionEvent.ACTION_MOVE: {

                if(xyFound == false){
                    centreX = (int) ev.getX();
                    centreY = (int) ev.getY();
                    xyFound = true;
                }else{
                    centreA = (int) ev.getX();
                    centreB = (int) ev.getY();
                    bothCirclesInPlace = true;
                    }

                    findCirclePixels();
                 // TouchView.this.invalidate();
                    break;

            }*/           

            case MotionEvent.ACTION_UP: 

                break;

        }
        return true;
    }//end of onTouchEvent





    public void initSlider(final HorizontalSlider slider)
    {

        slider.setOnProgressChangeListener(changeListener);


    }



    private OnProgressChangeListener changeListener = new OnProgressChangeListener() {


        @Override
        public void onProgressChanged(View v, int progress) {



              setProgress(progress);



        }
    };




    @Override
    public void onDraw(Canvas canvas){
        super.onDraw(canvas);

        Log.e(TAG, "******about to draw bgr ");
        canvas.drawBitmap(bgr, 0, 0, null);

        if(bothCirclesInPlace == true){

                if(overLay != null){
                    Log.e(TAG, "******about to draw overlay1 ");
        canvas.drawBitmap(overLay, centreX-75, centreY-75, null);
                }
            if(overLay2 != null){
                Log.e(TAG, "******about to draw overlay2 ");
        canvas.drawBitmap(overLay2, centreA-75, centreB-75, null);
            }

        }

    }//end of onDraw




    protected void setProgress(int progress2) {
        Log.e(TAG, "***********in SETPROGRESS");
        this.Progress = progress2;



        findCirclePixels();


    }




}

.

La actividad de llamada.

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.View.OnClickListener;
import android.widget.Button;

public class Jjilapp extends Activity {




    private static final String TAG = "*********jjil";


    @Override 
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);

        setContentView(R.layout.touchview);
        final TouchView touchView = (TouchView)findViewById(R.id.touchview); 
        final HorizontalSlider slider = (HorizontalSlider)findViewById(R.id.slider); 

        touchView.initSlider(slider);




    }//end of oncreate




}

Si necesitas ayuda, solo pregunta. espero que esto ayude

Answer 4

Gracias a ti por ese código. Me ayuda mucho. Lo transcribí para Java. ¿Tal vez alguien tiene una función similar para simular la distorsión tangencial?

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import com.jhlabs.image.InterpolateFilter;

class Filters{
    float xscale;
    float yscale;
    float xshift;
    float yshift;
    int [] s;
    public Filters(){

    }

    public BufferedImage barrel (BufferedImage input, float k){

        float centerX=input.getWidth()/2; //center of distortion
        float centerY=input.getHeight()/2;

        int width = input.getWidth(); //image bounds
        int height = input.getHeight();

        BufferedImage dst = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB); //output pic

          xshift = calc_shift(0,centerX-1,centerX,k);
          float newcenterX = width-centerX;
          float xshift_2 = calc_shift(0,newcenterX-1,newcenterX,k);

          yshift = calc_shift(0,centerY-1,centerY,k);
          float newcenterY = height-centerY;
          float yshift_2 = calc_shift(0,newcenterY-1,newcenterY,k);

          xscale = (width-xshift-xshift_2)/width;
          yscale = (height-yshift-yshift_2)/height;

          for(int j=0;j<dst.getHeight();j++){
              for(int i=0;i<dst.getWidth();i++){
                float x = getRadialX((float)i,(float)j,centerX,centerY,k);
                float y = getRadialY((float)i,(float)j,centerX,centerY,k);
                sampleImage(input,x,y);
                int color = ((s[1]&0x0ff)<<16)|((s[2]&0x0ff)<<8)|(s[3]&0x0ff);
    //            System.out.print(i+" "+j+" //");

                dst.setRGB(i, j, color);

              }
            }
        return dst;
    }

    void sampleImage(BufferedImage arr, float idx0, float idx1)
    {
        s = new int [4];
      if(idx0<0 || idx1<0 || idx0>(arr.getHeight()-1) || idx1>(arr.getWidth()-1)){
        s[0]=0;
        s[1]=0;
        s[2]=0;
        s[3]=0;
        return;
      }

      float idx0_fl=(float) Math.floor(idx0);
      float idx0_cl=(float) Math.ceil(idx0);
      float idx1_fl=(float) Math.floor(idx1);
      float idx1_cl=(float) Math.ceil(idx1);

      int [] s1 = getARGB(arr,(int)idx0_fl,(int)idx1_fl);
      int [] s2 = getARGB(arr,(int)idx0_fl,(int)idx1_cl);
      int [] s3 = getARGB(arr,(int)idx0_cl,(int)idx1_cl);
      int [] s4 = getARGB(arr,(int)idx0_cl,(int)idx1_fl);

      float x = idx0 - idx0_fl;
      float y = idx1 - idx1_fl;

      s[0]= (int) (s1[0]*(1-x)*(1-y) + s2[0]*(1-x)*y + s3[0]*x*y + s4[0]*x*(1-y));
      s[1]= (int) (s1[1]*(1-x)*(1-y) + s2[1]*(1-x)*y + s3[1]*x*y + s4[1]*x*(1-y));
      s[2]= (int) (s1[2]*(1-x)*(1-y) + s2[2]*(1-x)*y + s3[2]*x*y + s4[2]*x*(1-y));
      s[3]= (int) (s1[3]*(1-x)*(1-y) + s2[3]*(1-x)*y + s3[3]*x*y + s4[3]*x*(1-y));
    }

    int [] getARGB(BufferedImage buf,int x, int y){
        int rgb = buf.getRGB(x, y); // Returns by default ARGB.
        int [] scalar = new int[4];
        scalar[0] = (rgb >>> 24) & 0xFF;
        scalar[1] = (rgb >>> 16) & 0xFF;
        scalar[2] = (rgb >>> 8) & 0xFF;
        scalar[3] = (rgb >>> 0) & 0xFF;
        return scalar;
    }

    float getRadialX(float x,float y,float cx,float cy,float k){
      x = (x*xscale+xshift);
      y = (y*yscale+yshift);
      float res = x+((x-cx)*k*((x-cx)*(x-cx)+(y-cy)*(y-cy)));
      return res;
    }

    float getRadialY(float x,float y,float cx,float cy,float k){
      x = (x*xscale+xshift);
      y = (y*yscale+yshift);
      float res = y+((y-cy)*k*((x-cx)*(x-cx)+(y-cy)*(y-cy)));
      return res;
    }

    float thresh = 1;

    float calc_shift(float x1,float x2,float cx,float k){
      float x3 = (float)(x1+(x2-x1)*0.5);
      float res1 = x1+((x1-cx)*k*((x1-cx)*(x1-cx)));
      float res3 = x3+((x3-cx)*k*((x3-cx)*(x3-cx)));

      if(res1>-thresh && res1 < thresh)
        return x1;
      if(res3<0){
        return calc_shift(x3,x2,cx,k);
      }
      else{
        return calc_shift(x1,x3,cx,k);
      }
    }
}

Answer 5

¿Quieres usar esta distorsión en las imágenes sintetico, o quiere aplicar a una cámara de vídeo o algo?

En OPENCV usted debe ser capaz de hacer la calibración de la cámara (utilizando las funciones integradas, el algoritmo de Zhang) ..

En OpenGL ver esto.

Saludos