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#include <string>
#include <iostream>
#include "util.h"
#include "image.h"
#include "imageIO.h"
#include "constants.h"
#include "errorMessage.h"
int main(int argc, char** argv)
{
// parse command line
if(argc != 3)
{
std::cout << "Usage: " << argv[0] << " <image A> <image B>" << std::endl;
return -1;
}
std::string nameA(argv[1]);
std::string nameB(argv[2]);
// get image extensions
std::string extA = getExtension(nameA);
std::string extB = getExtension(nameB);
// check if both images have the same extension
if(extA != extB) errorMessage(" => different image types (PPM vs PFM).");
// load images
image imgA, imgB;
importImage(nameA, imgA);
importImage(nameB, imgB);
// check if both have the same dimension
if(imgA.width() != imgB.width() || imgA.height() != imgB.height())
errorMessage(" => different images sizes (%dx%d) vs (%dx%d).", imgA.width(), imgA.height(), imgB.width(), imgB.height());
// compute the difference image
image diff(imgA.width(), imgA.height());
color avgDiff, maxDiff;
unsigned long diffCount = 0;
for(image::size_type y=0; y < diff.height(); y++)
for(image::size_type x=0; x < diff.width(); x++)
{
// per pixel difference
color diffColor = imgA(x,y) - imgB(x,y);
diff(x,y) = (extA == "ppm") ? abs(diffColor) : diffColor;
// if different => update average and max (abs value)
diffColor.abs();
if(diffColor.r > EPSILON || diffColor.g > EPSILON || diffColor.b > EPSILON)
{
diffCount++;
avgDiff += diffColor;
maxDiff = color(std::max(maxDiff.r, diffColor.r), std::max(maxDiff.g, diffColor.g), std::max(maxDiff.b, diffColor.b));
}
}
// output results if different
if(extA == "ppm" && diffCount != 0)
{
avgDiff /= diffCount;
std::cout << " => There are " << diffCount << " pixels that differ." << std::endl;
std::cout << " Average difference: " << avgDiff << " [base 256: " << (avgDiff * 256.0f) << "]" << std::endl;
std::cout << " Maximum difference: " << maxDiff << " [base 256: " << (maxDiff * 256.0f) << "]" << std::endl;
// write out difference image
exportImage("diff.ppm", diff);
}
else if(extA == "pfm" && diffCount != 0)
{
avgDiff /= diffCount;
std::cout << " => There are " << diffCount << " pixels that differ." << std::endl;
std::cout << " Average difference: " << avgDiff << std::endl;
std::cout << " Maximum difference: " << maxDiff << std::endl;
// write out difference image
exportImage("diff.pfm", diff);
}
// if equal, let the user know
else {
std::cout << " => Both images are equal.\r\n";
}
// Done.
return 0;
}
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