Visual Servoing Platform  version 3.5.1 under development (2022-12-01)
tutorial-contrast-sharpening.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))
std::string input_filename = "Crayfish-low-contrast.png";
int blockRadius = 150;
int bins = 256;
float slope = 3.0f;
float sigma = 2.0f;
double weight = 0.5;
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]) == "--blockRadius" && i + 1 < argc) {
blockRadius = atoi(argv[i + 1]);
} else if (std::string(argv[i]) == "--bins" && i + 1 < argc) {
bins = atoi(argv[i + 1]);
} else if (std::string(argv[i]) == "--slope" && i + 1 < argc) {
slope = (float)atof(argv[i + 1]);
} else if (std::string(argv[i]) == "--sigma" && i + 1 < argc) {
sigma = (float)atof(argv[i + 1]);
} else if (std::string(argv[i]) == "--weight" && i + 1 < argc) {
weight = atof(argv[i + 1]);
} else if (std::string(argv[i]) == "--help" || std::string(argv[i]) == "-h") {
std::cout << "Usage: " << argv[0]
<< " [--input <input image>]"
" [--blockRadius <block radius for CLAHE>] "
" [--bins <nb histogram bins for CLAHE>] [--slope <slope for CLAHE>]"
" [--sigma <Gaussian kernel standard deviation>] [--weight <unsharp mask weighting>]"
" [--help] [-h]"
<< std::endl;
return EXIT_SUCCESS;
}
}
vpImage<vpRGBa> I_color;
vpImageIo::read(I_color, input_filename);
#ifdef VISP_HAVE_X11
vpDisplayX d, d2, d3, d4, d5, d6;
#elif defined(VISP_HAVE_GDI)
vpDisplayGDI d, d2, d3, d4, d5, d6;
#elif defined(VISP_HAVE_OPENCV)
vpDisplayOpenCV d, d2, d3, d4, d5, d6;
#endif
d.init(I_color, 0, 0, "Input color image");
vpImage<vpRGBa> I_stretch;
vp::stretchContrast(I_color, I_stretch);
d2.init(I_stretch, I_color.getWidth(), 10, "Stretch contrast");
vpImage<vpRGBa> I_stretch_hsv;
vp::stretchContrastHSV(I_color, I_stretch_hsv);
d3.init(I_stretch_hsv, 0, I_color.getHeight() + 80, "Stretch contrast HSV");
vpImage<vpRGBa> I_hist_eq;
vp::equalizeHistogram(I_color, I_hist_eq);
d4.init(I_hist_eq, I_color.getWidth(), I_color.getHeight() + 80, "Histogram equalization");
vpImage<vpRGBa> I_clahe;
vp::clahe(I_color, I_clahe, blockRadius, bins, slope);
d5.init(I_clahe, 0, 2 * I_color.getHeight() + 80, "CLAHE");
vpImage<vpRGBa> I_unsharp;
vp::unsharpMask(I_clahe, I_unsharp, sigma, weight);
d6.init(I_unsharp, I_color.getWidth(), 2 * I_color.getHeight() + 80, "Unsharp mask");
vpDisplay::display(I_stretch);
vpDisplay::display(I_stretch_hsv);
vpDisplay::display(I_hist_eq);
vpDisplay::display(I_unsharp);
vpDisplay::displayText(I_unsharp, 20, 20, "Click to quit.", vpColor::red);
vpDisplay::flush(I_color);
vpDisplay::flush(I_stretch);
vpDisplay::flush(I_stretch_hsv);
vpDisplay::flush(I_hist_eq);
vpDisplay::flush(I_clahe);
vpDisplay::flush(I_unsharp);
vpDisplay::getClick(I_unsharp);
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
void init(vpImage< unsigned char > &I, int win_x=-1, int win_y=-1, const std::string &win_title="")
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
unsigned int getWidth() const
Definition: vpImage.h:246
unsigned int getHeight() const
Definition: vpImage.h:188
VISP_EXPORT void clahe(const vpImage< unsigned char > &I1, vpImage< unsigned char > &I2, int blockRadius=150, int bins=256, float slope=3.0f, bool fast=true)
Definition: vpCLAHE.cpp:228
VISP_EXPORT void stretchContrast(vpImage< unsigned char > &I)
Definition: vpImgproc.cpp:419
VISP_EXPORT void stretchContrastHSV(vpImage< vpRGBa > &I)
Definition: vpImgproc.cpp:556
VISP_EXPORT void equalizeHistogram(vpImage< unsigned char > &I)
Definition: vpImgproc.cpp:165
vp_deprecated VISP_EXPORT void unsharpMask(vpImage< unsigned char > &I, unsigned int size=7, double weight=0.6)
Definition: vpImgproc.cpp:718