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ftpsnr.cpp
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ftpsnr.cpp
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//
// Created by Nicola Pierazzo on 01/04/16.
//
#include <cmath>
#include <utility>
#include <tuple>
#include <iostream>
#include "Image.hpp"
#include "utils.hpp"
using namespace imgutils;
using std::cerr;
using std::endl;
using std::cout;
using std::tuple;
using std::make_tuple;
using std::pair;
using std::tie;
using std::max;
using std::min;
using std::log10;
// flat patches count "weight", while other patches count 1
tuple<double, double, double> compute_ftmse(const Image& mask,
const Image& in1,
const Image& in2,
float t1, float t2) {
double fsum = 0., fw = 0., tsum = 0., tw = 0.;
for (int row = 0; row < in1.rows(); ++row) {
for (int col = 0; col < in1.columns(); ++col) {
double d = 0.;
for (int chan = 0; chan < in1.channels(); ++chan) {
float v1 = min(max(in1.val(col, row, chan), 0.f), 255.f);
float v2 = min(max(in2.val(col, row, chan), 0.f), 255.f);
d += (v1 - v2) * (v1 - v2);
}
float m = min(max(mask.val(col, row), t1), t2);
double sc = (t2 - m) / (t2 - t1);
fsum += sc * d;
fw += sc;
tsum += (1 - sc) * d;
tw += (1 - sc);
}
}
fw *= in1.channels();
tw *= in1.channels();
double fmse = fsum / fw;
double tmse = tsum / tw;
double mse = (fsum + tsum) / (fw + tw);
return make_tuple(fmse, tmse, mse);
}
int main(int argc, char** argv) {
bool usage = static_cast<bool>(pick_option(&argc, argv, "h", nullptr));
float t1 = static_cast<float>(atof(pick_option(&argc, argv, "t1", "1")));
float t2 = static_cast<float>(atof(pick_option(&argc, argv, "t2", "2")));
if (usage || argc < 3) {
cerr << "usage: " << argv[0] << " mask image1 [image2] [-t1 threshold] " <<
"[-t2 threshold]" << endl;
cerr << " when the mask is < t1 (" << t1 << ") the zone is flat" << endl;
cerr << " when the mask is > t2 (" << t2 << ") the zone is textured" << endl;
return EXIT_SUCCESS;
}
Image mask = read_image(argv[1]);
Image in1 = read_image(argv[2]);
Image in2 = read_image(argc > 3 ? argv[3] : "-");
if (mask.channels() != 1) {
cerr << "The input images should have one channel." << endl;
return EXIT_FAILURE;
}
if (t1 > t2) {
cerr << "t1 should be smaller than t2." << endl;
return EXIT_FAILURE;
}
if (in1.rows() != in2.rows() ||
in1.columns() != in2.columns() ||
in1.channels() != in2.channels()) {
cerr << "The two images should have the same dimension." << endl;
return EXIT_FAILURE;
}
double fmse, tmse, mse;
tie(fmse, tmse, mse) = compute_ftmse(mask, in1, in2, t1, t2);
double fpsnr = -10. * log10(fmse / (255. * 255.));
double tpsnr = -10. * log10(tmse / (255. * 255.));
double psnr = -10. * log10(mse / (255. * 255.));
cout << "fPSNR: " << fpsnr << endl;
cout << "tPSNR: " << tpsnr << endl;
cout << "PSNR: " << psnr << endl;
return EXIT_SUCCESS;
}