Opencv图片明暗处理

#include <iostream>
#include <opencv2/opencv.hpp>

using namespace std;
using namespace cv;

//图片明暗处理
cv::Mat shadingTreatment(cv::Mat imgParam);

int main()
{
    double alpha; //对比度
    int beta;     //亮度
    //Mat image = imread("F:\\OpencvProject\\CamerasAndSurveillance201910\\x64\\Debug\\face_data\\20191025143712025.jpg");
    Mat image = imread("D:\\images\\特朗普\\0.jpg");

    if (image.empty())
    {
        return 0;
    }

    cv::Mat new_image = shadingTreatment(image);

    /// 目标图像空间预分配
    /// 显示图像
    imshow("原图像", image);
    imshow("新图像", new_image);


    /// 等待键盘事件
    waitKey(0);



    return 0;
}


//图片明暗处理
cv::Mat shadingTreatment(cv::Mat imgParam)
{
    Mat new_image = Mat::zeros(imgParam.size(), imgParam.type());


    /// 输入初始化值
    //cout << "请输入对比度1-3： ";
    //cin >> alpha;
    //cout << "请输入亮度1-100： ";
    //cin >> beta;

    double alpha = 1.2;
    int beta = 50;
    /// 执行变换 new_image(i,j) = alpha    * image(i,j) + beta
    for (int y = 0; y < imgParam.rows; y++)
    {
        for (int x = 0; x < imgParam.cols; x++)
        {
            for (int c = 0; c < 3; c++)
            {
                new_image.at<Vec3b>(y, x)[c] = saturate_cast<uchar>(alpha * (imgParam.at<Vec3b>(y, x)[c]) + beta);
            }
        }
    }

    return new_image;
}