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

void hit(Mat image, Mat &img, int minn = 0, int maxx = 255)
{
    double minVal, maxVal;
    //复制图像 深拷贝
    image.copyTo(img);
    //获取最大值、最小值
    minMaxLoc(img, &minVal, &maxVal);
    //获取行，列*通道数
    int n = img.rows;
    int m = img.cols * img.channels();
    for (int i = 0; i < n; i++)
    {
        uchar* data = img.ptr<uchar>(i);
        for (int j = 0; j < m; j++) {
            data[j] = (maxx - minn) / (maxVal - minVal) * (data[j] - minVal) + minn;
        }
    }
}
int main(int argc, const char* argv[]) {
    //读取图像
    Mat img = imread("G:/image/xs.jpg"), img_gray;
    //改为灰度图像
    cvtColor(img, img, COLOR_BGR2GRAY);
    //放大图像
    resize(img, img, Size(256,256), INTER_AREA);
    Mat normalize_img, equal_img;
    //归一化
    hit(img, normalize_img);
    //均衡化
    equalizeHist(img, equal_img);
    //输出图像
    imshow("Original image", img);
    imshow("normalize_img", normalize_img);
    imshow("equal_img", equal_img);
    waitKey(0);
    return 0;
}