Hello, I am trying to implement haar wavelet transform using opencv. I am able to decompose original image into sub bands but facing problem in reconstruction.. I am giving code as below
#include <opencv2\highgui\highgui.hpp>
#include <opencv2\core\core.hpp>
#include <opencv2\core\mat.hpp>
#include <opencv2\imgproc\imgproc.hpp>
#include<iostream>
#include<math.h>
#include<conio.h>
using namespace std;
using namespace cv;
class image
{
public:
Mat im,im1,im2,im3,im4,im5,im6,temp,im11,im12,im13,im14,imi,imd,imr;
float a,b,c,d;
int getim();
};
int image::getim()
{
im=imread("lena.jpg",0); //Load image in Gray Scale
imi=Mat::zeros(im.rows,im.cols,CV_8U);
im.copyTo(imi);
im.convertTo(im,CV_32F,1.0,0.0);
//for row decomposition
im1=Mat::zeros(im.rows/2,im.cols,CV_32F);
im2=Mat::zeros(im.rows/2,im.cols,CV_32F);
//for column decomposition
im3=Mat::zeros(im.rows/2,im.cols/2,CV_32F);
im4=Mat::zeros(im.rows/2,im.cols/2,CV_32F);
im5=Mat::zeros(im.rows/2,im.cols/2,CV_32F);
im6=Mat::zeros(im.rows/2,im.cols/2,CV_32F);
//--------------Decomposition-------------------
for(int rcnt=0;rcnt<im.rows;rcnt+=2)
{
for(int ccnt=0;ccnt<im.cols;ccnt++)
{
a=im.at<float>(rcnt,ccnt);
b=im.at<float>(rcnt+1,ccnt);
c=(a+b)*0.707;
d=(b-a)*0.707;
int _rcnt=rcnt/2;
im1.at<float>(_rcnt,ccnt)=c;
im2.at<float>(_rcnt,ccnt)=d;
}
}
for(int rcnt=0;rcnt<im.rows/2;rcnt++)
{
for(int ccnt=0;ccnt<im.cols;ccnt+=2)
{
a=im1.at<float>(rcnt,ccnt);
b=im1.at<float>(rcnt,ccnt+1);
c=(a+b)*0.707;
d=(b-a)*0.707;
int _ccnt=ccnt/2;
im3.at<float>(rcnt,_ccnt)=c;
im4.at<float>(rcnt,_ccnt)=d;
}
}
for(int rcnt=0;rcnt<im.rows/2;rcnt++)
{
for(int ccnt=0;ccnt<im.cols;ccnt+=2)
{
a=im2.at<float>(rcnt,ccnt);
b=im2.at<float>(rcnt,ccnt+1);
c=(a+b)*0.707;
d=(b-a)*0.707;
int _ccnt=ccnt/2;
im5.at<float>(rcnt,_ccnt)=c;
im6.at<float>(rcnt,_ccnt)=d;
}
}
imr=Mat::zeros(256,256,CV_32F);
imd=Mat::zeros(256,256,CV_32F);
im3.copyTo(imd(Rect(0,0,128,128)));
im4.copyTo(imd(Rect(0,127,128,128)));
im5.copyTo(imd(Rect(127,0,128,128)));
im6.copyTo(imd(Rect(127,127,128,128)));
//---------------------------------Reconstruction-------------------------------------
im11=Mat::zeros(im.rows/2,im.cols,CV_32F);
im12=Mat::zeros(im.rows/2,im.cols,CV_32F);
im13=Mat::zeros(im.rows/2,im.cols,CV_32F);
im14=Mat::zeros(im.rows/2,im.cols,CV_32F);
for(int rcnt=0;rcnt<im.rows/2;rcnt++)
{
for(int ccnt=0;ccnt<im.cols/2;ccnt++)
{
int _ccnt=ccnt*2;
im11.at<float>(rcnt,_ccnt)=im3.at<float>(rcnt,ccnt); //Upsampling of stage I
im12.at<float>(rcnt,_ccnt)=im4.at<float>(rcnt,ccnt);
im13.at<float>(rcnt,_ccnt)=im5.at<float>(rcnt,ccnt);
im14.at<float>(rcnt,_ccnt)=im6.at<float>(rcnt,ccnt);
}
}
for(int rcnt=0;rcnt<im.rows/2;rcnt++)
{
for(int ccnt=0;ccnt<im.cols-2;ccnt+=2)
{
a=im11.at<float>(rcnt,ccnt);
b=im11.at<float>(rcnt,ccnt+2);
c=(a+b)/0.707;
im11.at<float>(rcnt,ccnt)=c;
a=im12.at<float>(rcnt,ccnt);
b=im12.at<float>(rcnt,ccnt+2);
d=(a-b)/0.707; //Filtering at Stage I
im12.at<float>(rcnt,ccnt)=d;
a=im13.at<float>(rcnt,ccnt);
b=im13.at<float>(rcnt,ccnt+2);
c=(a+b)/0.707;
im13.at<float>(rcnt,ccnt)=c;
a=im14.at<float>(rcnt,ccnt);
b=im14.at<float>(rcnt,ccnt+2);
d=(a-b)/0.707;
im14.at<float>(rcnt,ccnt)=d;
}
}
for(int rcnt=0;rcnt<im.rows/2;rcnt++)
{
for(int ccnt=0;ccnt<im.cols-1;ccnt++)
{
//Adding Column Component I and II
im1.at<float>(rcnt,ccnt)=im11.at<float>(rcnt,ccnt)+im12.at<float>(rcnt,ccnt+1);//Column Component I
im2.at<float>(rcnt,ccnt)=im13.at<float>(rcnt,ccnt)+im14.at<float>(rcnt,ccnt+1);//Column Component II
}
}
im.convertTo(im,CV_32F);
temp=Mat::zeros(im.rows,im.cols,CV_32F);
for(int rcnt=0;rcnt<im.rows/2;rcnt++)
{
for(int ccnt=0;ccnt<im.cols;ccnt++)
{
int _rcnt=rcnt*2;
im.at<float>(_rcnt,ccnt)=im1.at<float>(rcnt,ccnt); //Upsampling at stage II
temp.at<float>(_rcnt,ccnt)=im2.at<float>(rcnt,ccnt);
}
}
for(int rcnt=0;rcnt<im.rows-2;rcnt+=2)
{
for(int ccnt=0;ccnt<im.cols;ccnt++)
{
a=im.at<float>(rcnt,ccnt);
b=im.at<float>(rcnt+2,ccnt);
c=(a+b)/0.707;
im.at<float>(rcnt,ccnt)=c; //Filtering at Stage II
a=temp.at<float>(rcnt,ccnt);
b=temp.at<float>(rcnt+2,ccnt);
c=(a-b)/0.707;
temp.at<float>(rcnt,ccnt)=c;
}
}
for(int rcnt=0;rcnt<im.rows-1;rcnt++)
{
for(int ccnt=0;ccnt<im.cols;ccnt++)
{
//Adding Row Component I and II
imr.at<float>(rcnt,ccnt)=im.at<float>(rcnt,ccnt)+temp.at<float>(rcnt+1,ccnt);
}
}
imd.convertTo(imd,CV_8U);
namedWindow("Input Image",1);
imshow("Input Image",imi);
namedWindow("Wavelet Decomposition",1);
imshow("Wavelet Decomposition",imd);
imr.convertTo(imr,CV_8U);
namedWindow("Wavelet Reconstruction",1);
imshow("Wavelet Reconstruction",imr);
waitKey(0);
return 0;
}
int main()
{
image my;
my.getim();
return 0;
}
How to slove the problem
