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augustin64 2025-01-29 12:17:45 +01:00
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2
.gitignore vendored Normal file
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build
out.*

3
image-processing/1-SlicedOptimalTransport/c++/CMakeLists.txt
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set(EXAMPLES
colorTransfer
gammaCorrection
grayscale
equalization
)
foreach(EXAMPLE ${EXAMPLES})

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image-processing/1-SlicedOptimalTransport/c++/equalization.cpp Normal file
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/*
Copyright (c) 2020 CNRS
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIEDi
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <iostream>
#include <string>
#include <random>
#include <vector>
//Command-line parsing
#include <CLI11.hpp>
//Image filtering and I/O
#define cimg_display 0
#include <CImg.h>
#define STB_IMAGE_IMPLEMENTATION
#include <stb_image.h>
#define STB_IMAGE_WRITE_IMPLEMENTATION
#include <stb_image_write.h>
unsigned char min(unsigned char a, unsigned char b) {
return a < b ? a : b;
}
unsigned char max(unsigned char a, unsigned char b) {
return a > b ? a : b;
}
//Global flag to silent verbose messages
bool silent;
int main(int argc, char **argv)
{
CLI::App app{"colorTransfer"};
std::string sourceImage;
app.add_option("-s,--source", sourceImage, "Source image")->required()->check(CLI::ExistingFile);
std::string outputImage= "output.png";
app.add_option("-o,--output", outputImage, "Output image")->required();
unsigned int nbSteps = 3;
app.add_option("-n,--nbsteps", nbSteps, "Number of sliced steps (3)");
silent = false;
app.add_flag("--silent", silent, "No verbose messages");
CLI11_PARSE(app, argc, argv);
//Image loading
int width,height, nbChannels;
unsigned char *source = stbi_load(sourceImage.c_str(), &width, &height, &nbChannels, 0);
if (!silent) std::cout<< "Source image: "<<width<<"x"<<height<<" ("<<nbChannels<<")"<< std::endl;
if (nbChannels < 3)
{
std::cout<< "Input images must be RGB images."<<std::endl;
exit(1);
}
//Main computation
std::vector<unsigned char> output(width*height*nbChannels);
//As an example, we just scan the pixels of the source image
//and swap the color channels.
unsigned int cum_r[255];
unsigned int cum_g[255];
unsigned int cum_b[255];
for (auto i=0; i < 255; i++) {
cum_r[i] = cum_g[i] = cum_b[i] = 0;
}
for(auto i = 0 ; i < width ; ++i) {
for(auto j = 0; j < height; ++j) {
auto indexPixel = nbChannels*(width*j+i);
cum_r[source[ indexPixel ]]++;
cum_g[source[indexPixel+1]]++;
cum_b[source[indexPixel+2]]++;
}
}
unsigned int distrib_r[255];
unsigned int distrib_g[255];
unsigned int distrib_b[255];
int total_px = width*height;
int cur_cum_r, cur_cum_g, cur_cum_b;
cur_cum_r, cur_cum_g, cur_cum_b = 0;
for (auto i=0; i < 255; i++) {
cur_cum_r += cum_r[i];
cur_cum_g += cum_g[i];
cur_cum_b += cum_b[i];
distrib_r[i] = 255*cur_cum_r/total_px;
distrib_g[i] = 255*cur_cum_g/total_px;
distrib_b[i] = 255*cur_cum_b/total_px;
}
for(auto i = 0 ; i < width ; ++i)
{
for(auto j = 0; j < height; ++j)
{
auto indexPixel = nbChannels*(width*j+i);
unsigned char r = source[ indexPixel ];
unsigned char g = source[ indexPixel + 1];
unsigned char b = source[ indexPixel + 2];
//Swapping the channels
output[ indexPixel ] = distrib_r[r];
output[ indexPixel + 1 ] = distrib_g[g];
output[ indexPixel + 2 ] = distrib_b[b];
if (nbChannels == 4) //just copying the alpha value if any
output[ indexPixel + 3] = source[ indexPixel + 3];
}
}
//Final export
if (!silent) std::cout<<"Exporting.."<<std::endl;
int errcode = stbi_write_png(outputImage.c_str(), width, height, nbChannels, output.data(), nbChannels*width);
if (!errcode)
{
std::cout<<"Error while exporting the resulting image."<<std::endl;
exit(errcode);
}
stbi_image_free(source);
exit(0);
}

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image-processing/1-SlicedOptimalTransport/c++/gammaCorrection.cpp Normal file
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/*
Copyright (c) 2020 CNRS
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIEDi
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <iostream>
#include <string>
#include <random>
#include <vector>
//Command-line parsing
#include <CLI11.hpp>
//Image filtering and I/O
#define cimg_display 0
#include <CImg.h>
#define STB_IMAGE_IMPLEMENTATION
#include <stb_image.h>
#define STB_IMAGE_WRITE_IMPLEMENTATION
#include <stb_image_write.h>
unsigned char min(unsigned char a, unsigned char b) {
return a < b ? a : b;
}
unsigned char max(unsigned char a, unsigned char b) {
return a > b ? a : b;
}
double gam_correct(unsigned char a, float A, float gamma) {
return 256.0*pow(((float)a)/256.0, gamma)*A;
}
//Global flag to silent verbose messages
bool silent;
int main(int argc, char **argv)
{
CLI::App app{"colorTransfer"};
std::string sourceImage;
app.add_option("-s,--source", sourceImage, "Source image")->required()->check(CLI::ExistingFile);
std::string outputImage= "output.png";
app.add_option("-o,--output", outputImage, "Output image")->required();
unsigned int nbSteps = 3;
app.add_option("-n,--nbsteps", nbSteps, "Number of sliced steps (3)");
silent = false;
app.add_flag("--silent", silent, "No verbose messages");
CLI11_PARSE(app, argc, argv);
float A, gamma;
A = 1.0;
gamma = 1.4;
//Image loading
int width,height, nbChannels;
unsigned char *source = stbi_load(sourceImage.c_str(), &width, &height, &nbChannels, 0);
if (!silent) std::cout<< "Source image: "<<width<<"x"<<height<<" ("<<nbChannels<<")"<< std::endl;
if (nbChannels < 3)
{
std::cout<< "Input images must be RGB images."<<std::endl;
exit(1);
}
//Main computation
std::vector<unsigned char> output(width*height*nbChannels);
//As an example, we just scan the pixels of the source image
//and swap the color channels.
/*int min_r, min_g, min_b;
int max_r, max_g, max_b;
min_r, min_g, min_b = 256;
max_r, max_g, max_b = 0;
for (auto i=0; i < width; i++) {
for (auto j=0; j < height; j++) {
auto indexPixel = nbChannels*(width*j+i);
min_r = min(source[indexPixel], min_r);
min_g = min(source[indexPixel], min_g);
min_b = min(source[indexPixel], min_b);
max_r = max(source[indexPixel], max_r);
max_g = max(source[indexPixel], max_g);
max_b = max(source[indexPixel], max_b);
}
}
min_r = gam_correct(min_r, A, gamma);
min_g = gam_correct(min_g, A, gamma);
min_b = gam_correct(min_b, A, gamma);
max_r = gam_correct(max_r, A, gamma);
max_g = gam_correct(max_g, A, gamma);
max_b = gam_correct(max_b, A, gamma);*/
for(auto i = 0 ; i < width ; ++i) {
for(auto j = 0; j < height; ++j) {
auto indexPixel = nbChannels*(width*j+i);
unsigned char r = source[ indexPixel ];
unsigned char g = source[ indexPixel + 1];
unsigned char b = source[ indexPixel + 2];
//Swapping the channels
output[ indexPixel ] = gam_correct(r, A, gamma);
output[ indexPixel + 1 ] = gam_correct(g, A, gamma);
output[ indexPixel + 2 ] = gam_correct(b, A, gamma);
if (nbChannels == 4) //just copying the alpha value if any
output[ indexPixel + 3] = source[ indexPixel + 3];
}
}
//Final export
if (!silent) std::cout<<"Exporting.."<<std::endl;
int errcode = stbi_write_png(outputImage.c_str(), width, height, nbChannels, output.data(), nbChannels*width);
if (!errcode)
{
std::cout<<"Error while exporting the resulting image."<<std::endl;
exit(errcode);
}
stbi_image_free(source);
exit(0);
}

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image-processing/1-SlicedOptimalTransport/c++/grayscale.cpp Normal file
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/*
Copyright (c) 2020 CNRS
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIEDi
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <iostream>
#include <string>
#include <random>
#include <vector>
//Command-line parsing
#include <CLI11.hpp>
//Image filtering and I/O
#define cimg_display 0
#include <CImg.h>
#define STB_IMAGE_IMPLEMENTATION
#include <stb_image.h>
#define STB_IMAGE_WRITE_IMPLEMENTATION
#include <stb_image_write.h>
//Global flag to silent verbose messages
bool silent;
int main(int argc, char **argv)
{
CLI::App app{"colorTransfer"};
std::string sourceImage;
app.add_option("-s,--source", sourceImage, "Source image")->required()->check(CLI::ExistingFile);;
std::string outputImage= "output.png";
app.add_option("-o,--output", outputImage, "Output image")->required();
unsigned int nbSteps = 3;
app.add_option("-n,--nbsteps", nbSteps, "Number of sliced steps (3)");
silent = false;
app.add_flag("--silent", silent, "No verbose messages");
CLI11_PARSE(app, argc, argv);
//Image loading
int width,height, nbChannels;
unsigned char *source = stbi_load(sourceImage.c_str(), &width, &height, &nbChannels, 0);
if (!silent) std::cout<< "Source image: "<<width<<"x"<<height<<" ("<<nbChannels<<")"<< std::endl;
if (nbChannels < 3)
{
std::cout<< "Input images must be RGB images."<<std::endl;
exit(1);
}
//Main computation
std::vector<unsigned char> output(width*height);
// to grayscale
for(auto i = 0 ; i < width ; ++i)
{
for(auto j = 0; j < height; ++j)
{
auto indexPixel = nbChannels*(width*j+i);
unsigned char r = source[ indexPixel ];
unsigned char g = source[ indexPixel + 1];
unsigned char b = source[ indexPixel + 2];
unsigned char avg = (0.21*r+0.72*g+0.07*b);
//Swapping the channels
output[ width*j+i ] = avg;
}
}
//Final export
if (!silent) std::cout<<"Exporting.."<<std::endl;
int errcode = stbi_write_png(outputImage.c_str(), width, height, 1, output.data(), width);
if (!errcode)
{
std::cout<<"Error while exporting the resulting image."<<std::endl;
exit(errcode);
}
stbi_image_free(source);
exit(0);
}