Visual Servoing Platform  version 3.5.1 under development (2022-12-02)
tutorial-brightness-adjustment.cpp
#include <cstdlib>
#include <iostream>
#include <visp3/core/vpImage.h>
#include <visp3/gui/vpDisplayGDI.h>
#include <visp3/gui/vpDisplayOpenCV.h>
#include <visp3/gui/vpDisplayX.h>
#include <visp3/io/vpImageIo.h>
#if defined(VISP_HAVE_MODULE_IMGPROC)
#include <visp3/imgproc/vpImgproc.h>
#endif
int main(int argc, const char **argv)
{
#if defined(VISP_HAVE_MODULE_IMGPROC) && \
(defined(VISP_HAVE_X11) || defined(VISP_HAVE_GDI) || defined(VISP_HAVE_OPENCV)) && \
(defined(VISP_HAVE_PNG) || defined(VISP_HAVE_OPENCV))
std::string input_filename = "Sample_low_brightness.png";
double alpha = 10.0, beta = 50.0;
double gamma = 3.5;
int scale = 240, scaleDiv = 3, level = 0, kernelSize = -1;
double dynamic = 3.0;
for (int i = 1; i < argc; i++) {
if (std::string(argv[i]) == "--input" && i + 1 < argc) {
input_filename = std::string(argv[i + 1]);
} else if (std::string(argv[i]) == "--alpha" && i + 1 < argc) {
alpha = atof(argv[i + 1]);
} else if (std::string(argv[i]) == "--beta" && i + 1 < argc) {
beta = atof(argv[i + 1]);
} else if (std::string(argv[i]) == "--gamma" && i + 1 < argc) {
gamma = atof(argv[i + 1]);
} else if (std::string(argv[i]) == "--scale" && i + 1 < argc) {
scale = atoi(argv[i + 1]);
} else if (std::string(argv[i]) == "--scaleDiv" && i + 1 < argc) {
scaleDiv = atoi(argv[i + 1]);
} else if (std::string(argv[i]) == "--level" && i + 1 < argc) {
level = atoi(argv[i + 1]);
} else if (std::string(argv[i]) == "--kernelSize" && i + 1 < argc) {
kernelSize = atoi(argv[i + 1]);
} else if (std::string(argv[i]) == "--dynamic" && i + 1 < argc) {
dynamic = atof(argv[i + 1]);
} else if (std::string(argv[i]) == "--help" || std::string(argv[i]) == "-h") {
std::cout << "Usage: " << argv[0]
<< " [--input <input image>]"
" [--alpha <alpha for vp::adjust()>] [--beta <beta for "
"vp::adjust()>]"
" [--gamma <gamma for vp::gammaCorrection()>]"
" [--scale <scale for vp::retinex()> [--scaleDiv for "
"vp::retinex()]"
" [--level <level for vp::retinex()> [--kernelSize "
"<kernelSize for vp::retinex()>]"
" [--dynamic <dynamic for vp::retinex()>] [--help]"
<< std::endl;
return EXIT_SUCCESS;
}
}
vpImage<vpRGBa> I_color;
vpImageIo::read(I_color, input_filename);
vpImage<vpRGBa> I_color_res(I_color.getHeight(), 2 * I_color.getWidth());
I_color_res.insert(I_color, vpImagePoint());
#ifdef VISP_HAVE_X11
vpDisplayX d(I_color_res);
#elif defined(VISP_HAVE_GDI)
vpDisplayGDI d(I_color_res);
#elif defined(VISP_HAVE_OPENCV)
vpDisplayOpenCV d(I_color_res);
#endif
vpImage<vpRGBa> I_color_adjust;
vp::adjust(I_color, I_color_adjust, alpha, beta);
I_color_res.insert(I_color_adjust, vpImagePoint(0, I_color.getWidth()));
std::stringstream ss;
ss << "Sample_low_brightness_alpha=" << alpha << "_beta=" << beta << ".png";
vpImageIo::write(I_color_res, ss.str());
vpDisplay::display(I_color_res);
vpDisplay::displayText(I_color_res, 20, 20, "Brightness and contrast adjustment. Click to continue.", vpColor::red);
vpDisplay::flush(I_color_res);
vpDisplay::getClick(I_color_res);
vpImage<vpRGBa> I_color_gamma_correction;
vp::gammaCorrection(I_color, I_color_gamma_correction, gamma);
I_color_res.insert(I_color_gamma_correction, vpImagePoint(0, I_color.getWidth()));
ss.str("");
ss << "Sample_low_brightness_gamma=" << gamma << ".png";
vpImageIo::write(I_color_res, ss.str());
vpDisplay::display(I_color_res);
vpDisplay::displayText(I_color_res, 20, 20, "Gamma correction. Click to continue.", vpColor::red);
vpDisplay::flush(I_color_res);
vpDisplay::getClick(I_color_res);
vpImage<vpRGBa> I_color_equalize_histogram;
vp::equalizeHistogram(I_color, I_color_equalize_histogram);
I_color_res.insert(I_color_equalize_histogram, vpImagePoint(0, I_color.getWidth()));
ss.str("");
ss << "Sample_low_brightness_eqHist.png";
vpImageIo::write(I_color_res, ss.str());
vpDisplay::display(I_color_res);
vpDisplay::displayText(I_color_res, 20, 20, "Histogram equalization. Click to continue.", vpColor::red);
vpDisplay::flush(I_color_res);
vpDisplay::getClick(I_color_res);
vpImage<vpRGBa> I_color_retinex;
vp::retinex(I_color, I_color_retinex, scale, scaleDiv, level, dynamic, kernelSize);
I_color_res.insert(I_color_retinex, vpImagePoint(0, I_color.getWidth()));
ss.str("");
ss << "Sample_low_brightness_scale=" << scale << "_scaleDiv=" << scaleDiv << "_level=" << level
<< "_dynamic=" << dynamic << "_kernelSize=" << kernelSize << ".png";
vpImageIo::write(I_color_res, ss.str());
vpDisplay::display(I_color_res);
vpDisplay::displayText(I_color_res, 20, 20, "Retinex. Click to quit.", vpColor::red);
vpDisplay::flush(I_color_res);
vpDisplay::getClick(I_color_res);
return EXIT_SUCCESS;
#else
(void)argc;
(void)argv;
return 0;
#endif
}
static const vpColor red
Definition: vpColor.h:217
Display for windows using GDI (available on any windows 32 platform).
Definition: vpDisplayGDI.h:129
The vpDisplayOpenCV allows to display image using the OpenCV library. Thus to enable this class OpenC...
Use the X11 console to display images on unix-like OS. Thus to enable this class X11 should be instal...
Definition: vpDisplayX.h:135
static bool getClick(const vpImage< unsigned char > &I, bool blocking=true)
static void display(const vpImage< unsigned char > &I)
static void flush(const vpImage< unsigned char > &I)
static void displayText(const vpImage< unsigned char > &I, const vpImagePoint &ip, const std::string &s, const vpColor &color)
static void read(vpImage< unsigned char > &I, const std::string &filename, int backend=IO_DEFAULT_BACKEND)
Definition: vpImageIo.cpp:148
static void write(const vpImage< unsigned char > &I, const std::string &filename, int backend=IO_DEFAULT_BACKEND)
Definition: vpImageIo.cpp:292
Class that defines a 2D point in an image. This class is useful for image processing and stores only ...
Definition: vpImagePoint.h:89
unsigned int getWidth() const
Definition: vpImage.h:246
void insert(const vpImage< Type > &src, const vpImagePoint &topLeft)
Definition: vpImage.h:1112
unsigned int getHeight() const
Definition: vpImage.h:188
VISP_EXPORT void adjust(vpImage< unsigned char > &I, double alpha, double beta)
Definition: vpImgproc.cpp:81
VISP_EXPORT void gammaCorrection(vpImage< unsigned char > &I, double gamma)
Definition: vpImgproc.cpp:335
VISP_EXPORT void equalizeHistogram(vpImage< unsigned char > &I)
Definition: vpImgproc.cpp:165
VISP_EXPORT void retinex(vpImage< vpRGBa > &I, int scale=240, int scaleDiv=3, int level=RETINEX_UNIFORM, double dynamic=1.2, int kernelSize=-1)
Definition: vpRetinex.cpp:263