opencv图像对比度和亮度调整

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#include <istream> #include <opencv2/opencv.hpp>   using namespace cv; using namespace std;   int main(int argc, char **argv) {     Mat src, dst;     //    加载图片     src = imread("../../picture/bg1.webp", 1);     if (!src.data) {         printf("No image data \n");         return -1;     }     namedWindow("src", WINDOW_AUTOSIZE);     imshow("src", src);     int rows = src.rows;     int cols = src.cols;     dst = Mat::zeros(src.size(), src.type());     float alpha = 1.2;     float beta = 10;     for (int row = 0; row < rows; row++) {         for (int col = 0; col < cols; col++) {             if (src.channels() == 3) {                 float a = src.at<Vec3b>(row, col)[0];                 float b = src.at<Vec3b>(row, col)[1];                 float c = src.at<Vec3b>(row, col)[2];                 dst.at<Vec3b>(row, col)[0] = saturate_cast<uchar>(alpha * a + beta);                 dst.at<Vec3b>(row, col)[1] = saturate_cast<uchar>(alpha * b + beta);                 dst.at<Vec3b>(row, col)[2] = saturate_cast<uchar>(alpha * c + beta);             } else if (src.channels() == 1) {                 float d = src.at<uchar>(row, col);                 dst.at<uchar>(row, col) = saturate_cast<uchar>(alpha * d + beta);             }         }     }     namedWindow("dst", WINDOW_AUTOSIZE);     imshow("dst", dst);     //    等待按键     waitKey(0);     return 0; }