wehub-resource-sync
75 lines
1.7 KiB
C++
75 lines
1.7 KiB
C++
/**
|
|
* @file AddingImagesTrackbar.cpp
|
|
* @brief Simple linear blender ( dst = alpha*src1 + beta*src2 )
|
|
* @author OpenCV team
|
|
*/
|
|
|
|
#include "opencv2/imgcodecs.hpp"
|
|
#include "opencv2/highgui.hpp"
|
|
#include <iostream>
|
|
|
|
using namespace cv;
|
|
using std::cout;
|
|
|
|
/** Global Variables */
|
|
const int alpha_slider_max = 100;
|
|
int alpha_slider;
|
|
double alpha;
|
|
double beta;
|
|
|
|
/** Matrices to store images */
|
|
Mat src1;
|
|
Mat src2;
|
|
Mat dst;
|
|
|
|
//![on_trackbar]
|
|
/**
|
|
* @function on_trackbar
|
|
* @brief Callback for trackbar
|
|
*/
|
|
static void on_trackbar(int pos, void* userdata) {
|
|
(void) userdata;
|
|
alpha = (double)pos / alpha_slider_max;
|
|
beta = (1.0 - alpha);
|
|
addWeighted(src1, alpha, src2, beta, 0.0, dst);
|
|
imshow("Linear Blend", dst);
|
|
}
|
|
//![on_trackbar]
|
|
|
|
/**
|
|
* @function main
|
|
* @brief Main function
|
|
*/
|
|
int main(void)
|
|
{
|
|
//![load]
|
|
/// Read images (both must be of the same size and type)
|
|
src1 = imread(samples::findFile("LinuxLogo.jpg"));
|
|
src2 = imread(samples::findFile("WindowsLogo.jpg"));
|
|
//![load]
|
|
|
|
if (src1.empty()) { cout << "Error loading src1 \n"; return -1; }
|
|
if (src2.empty()) { cout << "Error loading src2 \n"; return -1; }
|
|
|
|
// Initialize trackbar value
|
|
alpha_slider = 0;
|
|
|
|
//![window]
|
|
namedWindow("Linear Blend", WINDOW_AUTOSIZE); //Create Window
|
|
//![window]
|
|
|
|
//![create_trackbar]
|
|
char TrackbarName[50];
|
|
snprintf(TrackbarName, sizeof(TrackbarName), "Alpha x %d", alpha_slider_max);
|
|
// Example userdata: Pass a pointer to an integer as userdata
|
|
createTrackbar(TrackbarName, "Linear Blend", &alpha_slider, alpha_slider_max, on_trackbar);
|
|
//![create_trackbar]
|
|
|
|
/// Show initial result
|
|
on_trackbar(alpha_slider, nullptr);
|
|
|
|
/// Wait for user input
|
|
waitKey(0);
|
|
return 0;
|
|
}
|