[opencv]6.添加滑动条调整图片

#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
#include <iostream>

using namespace std;
using namespace cv;

int main(int argc, char** argv)
{

Mat src = imread("pic.jpg");

if (!src.data)
{
cout << "Error loading the image" << endl;
return -1;
}

namedWindow("My Window", 1);

int iSliderValue1 = 50;
createTrackbar("Brightness", "My Window", &iSliderValue1, 100);//亮度

//Create trackbar to change contrast
int iSliderValue2 = 50;
createTrackbar("Contrast", "My Window", &iSliderValue2, 100);//对比度

while (true)
{

Mat dst;
int iBrightness = iSliderValue1 - 50;
double dContrast = iSliderValue2 / 50.0;
src.convertTo(dst, -1, dContrast, iBrightness);
imshow("My Window", dst);
int iKey = waitKey(50);
if (iKey == 27)
{
break;
}
}

return 0;
}