opencv+vs实现简单的图像灰度与亮度处理

#include <iostream>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>

using namespace std;
using namespace cv;

const string WINDOW_NAME = "对比度&亮度";
Mat src_img;
Mat dst_img;
int contrast_value;
int bright_value;

void on_change(int, void *) {
    for (int i = 0; i < src_img.rows; ++i) {
        for (int j = 0; j < src_img.cols; ++j) {
            for (int c = 0; c < 3; ++c) {
                dst_img.at<Vec3b>(i, j)[c] = saturate_cast<uchar>((contrast_value * 0.01) * src_img.at<Vec3b>(i, j)[c] + bright_value);
            }
        }
    }

    cout << contrast_value << ' ' << bright_value << endl;

    imshow(WINDOW_NAME, dst_img);
}

int main() {
    src_img = imread("img/1.jpg");