#include <opencv2/core.hpp>
#include <opencv2/imgproc.hpp>
#include <opencv2/highgui.hpp>
#include <iostream>
using namespace std;

int main()
{
    cv::Mat mat1(8, 8, CV_8UC3);
    cv::randu(mat1, cv::Scalar::all(0), cv::Scalar::all(255));
    cout << "src = " << endl << mat1 << endl;

    cv::Mat mat2;
    double alpha = 0.5, beta = 50;
    mat1.convertTo(mat2, -1, alpha, beta);
    cout << "src convertTo() = " << endl << mat2 << endl;

    // 按照对比度和亮度的线性公式进行调整
    cv::Mat mat3(mat1.rows, mat1.cols, CV_8UC3);
    if (mat3.empty())
        return -1;

    for (int row = 0; row < mat1.rows; ++row)
    {
        uchar* p1 = mat1.ptr<uchar>(row);
        uchar* p3 = mat3.ptr<uchar>(row);
        for (int col = 0; col < mat1.cols; ++col)
        {
            p3[col] = cv::saturate_cast<uchar>(p1[col] * alpha + beta);
        }
    }
    cout << "alpha * mat + beta = " << endl << mat3 << endl;

    // 查看两种方法的结果差异
    cv::Mat diff = mat2 - mat3;
    if (diff.empty())
        return -1;
    cout << "diff = " << endl << diff << endl;

    return 0;
}