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/* ************ starting point of module qfloatdct.c *************************** */
#include <iostream>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <Magick++.h>
#include <cmath>
#include "dct.h"
using namespace Magick;
using namespace std;
double getPSNR(Image* src, Image* addwtm)
{
Image image1 = *src;
Image image2 = *addwtm;
int w = image1.columns();
int h = image1.rows();
MagickCore::Quantum *pixels = image1.getPixels(0, 0, w, h);
MagickCore::Quantum *pixels1 = image2.getPixels(0, 0, w, h);
int row;
int column;
double tmp = 0;
unsigned offset1;
unsigned offset2;
double absdiff;
double MAX = 255;
for(row = 0; row < h; row++)
{
for(column = 0; column < w; column++)
{
offset1 = image1.channels() * (w * row + column);
offset2 = image2.channels() * (w * row + column);
absdiff = abs(pixels[offset1 + 0]/65535*255 - pixels1[offset2 + 0]/65535*255);
tmp = tmp + pow(absdiff, 2);
}
}
double MSE = tmp / (w*h);
double PSNR = 10*log10(pow(MAX,2)/MSE);
cout<< "PSNR = " << PSNR <<endl;
return MSE;
}
double getNC(Image* src, Image* addwtm)
{
Image image1 = *src;
Image image2 = *addwtm;
int w = image1.columns();
int h = image1.rows();
MagickCore::Quantum *pixels = image1.getPixels(0, 0, w, h);
MagickCore::Quantum *pixels1 = image2.getPixels(0, 0, w, h);
int row;
int column;
double tmp = 0;
unsigned offset1;
unsigned offset2;
double AA=0,AB=0,BB=0;
for(row = 0; row < h; row++)
{
for(column = 0; column < w; column++)
{
offset1 = image1.channels() * (w * row + column);
offset2 = image2.channels() * (w * row + column);
AA = AA + pow(pixels[offset1 + 3]/65535*255, 2);
BB = BB + pow(pixels1[offset2 + 0]/65535*255, 2);
AB = AB + (pixels[offset1 + 3]/65535*255) * (pixels1[offset2 + 0]/65535*255);
}
}
double NC = AB/(sqrt(AA)*sqrt(BB));
cout << "NC = " << NC <<endl;
return NC;
}
int main(void)
{
InitializeMagick(NULL);
Image src;
Image addwtm;
src.read("a01.png");
//image.display();
addwtm.read("image_w1a.png");
//image1.display();
//getPSNR(&src, &addwtm);
getNC(&src, &addwtm);
return 0;
}
/* ***************** ending point of module qfloatdct.c ************************* */
