java - why jTransform makes image turn yellow -
the fft , ifft sequence using jtransform not generates same results, although no visible difference can seen. visualized difference , found out not matter input image is, diff.jpg yellow, why happening? how can fix that?
here testing code, in check.java;
import org.jtransforms.fft.doublefft_2d; import org.jtransforms.fft.doublefft_3d; import static java.lang.math.abs; public class check { public static void main(string[] args){ try { double[][][] im=parser.getimagergb("res//kato_megumi.jpg"); doublefft_3d f3d=new doublefft_3d(im.length,im[0].length,im[0][0].length/2); f3d.complexforward(im); f3d.complexinverse(im,true); parser.setimagergb(im,"reflect.jpg"); double[][][] ref=parser.getimagergb("reflect.jpg"); double[][][] cmp=new double[im.length][im[0].length][im[0][0].length]; for(int i=0;i<im.length;i++) for(int j=0;j<im[0].length;j++) for(int k=0;k<im[0][0].length;k+=2) cmp[i][j][k]=ref[i][j][k]-im[i][j][k]; parser.setimagergb(cmp,"diff.jpg"); } catch (exception e) { e.printstacktrace(); } } } here parser.java:
import org.jtransforms.fft.doublefft_2d; import javax.imageio.imageio; import java.awt.image.bufferedimage; import java.io.file; import java.util.arraylist; import java.util.collections; import java.util.random; import static java.lang.math.min; import static java.lang.math.rint; public class parser { static int[] hmap,wmap; static double alpha=5.45; private static boolean debug=true; public static double[][][] getimagergb(string filename)throws exception{ bufferedimage im= imageio.read(new file(filename)); int[] image; int h=im.getheight(), w=im.getwidth(), type=im.gettype(),cnt=0,tmp; image=im.getrgb(0,0,w,h,null,0,w); double[][][] ret=new double[3][h][2*w]; for(int i=0;i<h;i++) for(int j=0;j<w;j++){ tmp=image[cnt++]; ret[0][i][2*j]=(tmp&0xff); //b ret[1][i][2*j]=((tmp&0xff00)>>8); //g ret[2][i][2*j]=((tmp&0xff0000)>>16); //r } return ret; } public static void setimagergb(double[][][] im, string filename)throws exception{ file file=new file(filename); if(!file.exists()) file.createnewfile(); int h=im[0].length,w=im[0][0].length/2,cnt=0,r,g,b; bufferedimage bim =new bufferedimage(w,h,bufferedimage.type_int_rgb); int[] out=new int[h*w]; for(int i=0;i<h;i++) for(int j=0;j<w;j++){ b=min(new double(rint(im[0][i][2*j])).intvalue(),255); g=min(new double(rint(im[1][i][2*j])).intvalue(),255); r=min(new double(rint(im[2][i][2*j])).intvalue(),255); out[cnt++]=(r<<16)|(g<<8)|(b); } bim.setrgb(0,0,w,h,out,0,w); imageio.write(bim,"jpeg",file); } private static int[] setmap(int seed,int len){ int[] save=new int[len]; arraylist<integer> sh=new arraylist<>(); for(int i=0;i<len;i++)sh.add(i); collections.shuffle(sh,new random(seed)); for(int i=0;i<len;i++)save[i]=sh.get(i); return save; } private static double[][][] encode(double[][][] input,int h,int w,int seed){ hmap=setmap(seed,h/2);wmap=setmap(seed+1,w/2); double[][][] ret=new double[input.length][h][w]; for(int ch=0;ch<input.length;ch++){ for(int i=0;i<input[0].length;i++) for(int j=0;j<input[0][0].length/2;j++) ret[ch][hmap[i]][2*wmap[j]]=input[ch][i][2*j]; for(int i=0;i<h/2;i++) for(int j=0;j<w/2;j++) ret[ch][h-1-i][w-2*(j+1)]=ret[ch][i][2*j]; } return ret; } private static double[][][] decode(double[][][] input,int h,int w,int seed){ hmap=setmap(seed,h/2);wmap=setmap(seed+1,w/2); double[][][] wm=new double[3][h][w]; for(int ch=0;ch<3;ch++){ for(int j=0;j<h/2;j++) for(int k=0;k<w/2;k++) wm[ch][j][2*k]=input[ch][hmap[j]][2*wmap[k]]; for(int j=0;j<h/2;j++) for(int k=0;k<w;k+=2) wm[ch][h-1-j][w-2-k]=wm[ch][j][k]; } return wm; } private static void cpxfft(double[][] input){ doublefft_2d f2d=new doublefft_2d(input.length,input[0].length/2); f2d.complexforward(input); } private static void cpxifft(double[][] input){ doublefft_2d f2d=new doublefft_2d(input.length,input[0].length/2); f2d.complexinverse(input,true); } public static void encrypt(string fn1,string fn2,string output)throws exception{ double[][][] im=getimagergb(fn1); double[][][] wm=getimagergb(fn2); double[][][] rwm=encode(wm,im[0].length,im[0][0].length,666666); for(int i=0;i<im.length;i++){ cpxfft(im[i]); for(int j=0;j<im[0].length;j++) for(int k=0;k<im[0][0].length;k++) im[i][j][k]+=rwm[i][j][k]*alpha; cpxifft(im[i]); } setimagergb(im,output); system.out.println("encrypt completed!"); } public static void decrypt(string fn1,string fn2,string output)throws exception{ double[][][] im=getimagergb(fn1); double[][][] src=getimagergb(fn2); assert( src.length==im.length&& src[0].length==im[0].length&& src[0][0].length==im[0][0].length); int ch=src.length,h=src[0].length,w=src[0][0].length; double[][][] dwm=new double[ch][h][w]; for(int i=0;i<ch;i++){ cpxfft(src[i]); cpxfft(im[i]); for(int j=0;j<h;j++) for(int k=0;k<w;k+=2) dwm[i][j][k]=(im[i][j][k]-src[i][j][k])/alpha; } double[][][] wm=decode(dwm,h,w,666666); setimagergb(wm,output); system.out.println("decrypt completed!"); } public static void main(string[] args)throws exception{ encrypt("res//kato_megumi.jpg","res//wm2.bmp","testoutput.jpg"); decrypt("res//kato_megumi.jpg","testoutput.jpg","decoded.png"); } }
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