I'm an unable to get the correct transform of a simple sinusoid. The code was written in java and relevent portion is reproduced below:

new_img is the buffered image 

for (int u=0;u<new_img.getWidth();u++)

            {

                for (int v=0;v<new_img.getHeight();v++)

                {    

                NNN[u][v]=fxy[u][v] * (int)Math.pow(-1,(u+v));

                                 //fxy[u][v],NNN[u][v] are pixel values

                F[u][v][0]=0;

                F[u][v][1]=0;

                uu++;

                 }

            }

  int vv=0;

          for (int u=0;u<new_img.getWidth();u++)

            {

             for (int a=0; a<new_img.getWidth();a++)

                {

                   for(int b=0;b<new_img.getHeight();b++)

                    { 

                     FX[u][0]=FX[u][0]+(NNN[a][b])* Math.cos(Math.PI/180*(6.28318*((u*a)/wd)));//real part of the row wise intermediate transform

                     FX[u][1] =FX[u][1]-((NNN[a][b])* Math.sin(Math.PI/180*(6.28318*((u*a)/wd))));// imag. part of the row wise transform

                     }

                 }

              }

                 for (int u=0;u<new_img.getWidth();u++)

                    {

                   for(int v=0;v<new_img.getHeight();v++)

                    {

                        for(int b=0;b<new_img.getHeight();b++)

                        { 

 //real & Imag. part of the col.wise transform.

                     F[u][v][0]=F[u][v][0]+(FX[u][0])* Math.cos(Math.PI/180*(6.28318*((v*b)/ht)))+(FX[u][1])* Math.sin(Math.PI/180*(6.28318*((v*b)/ht)));

                     F[u][v][1] =F[u][v][1]+(FX[u][1])* Math.cos(Math.PI/180*(6.28318*((v*b)/ht)))-((FX[u][0])* Math.sin(Math.PI/180*(6.28318*((v*b)/ht))));

                        }

                   double sum11=F[u][v][0]*F[u][v][0];

                   double sum22=F[u][v][1]*F[u][v][1];

                   f_r[vv]=(sum11+sum22)/(wd*ht);//wd&ht are the width & height of new_img which are in power of 2.

                   vv++;

                 }

               }  

 //the array f_r[] is set into the writable raster of a bufferedimage to obtain the image transform 

               rstr_f.setPixels(0,0,(new_img.getWidth()-1),(new_img.getHeight()-1),f_r);

   I'm unable to get the result.