Update HistograEqualization.cpp

Author: BBuf

Correction algorithm/HistograEqualization.cpp

@@ -0,0 +1,55 @@
+#include "opencv2/opencv.hpp"
+#include "iostream"
+#include "algorithm"
+#include "vector"
+#include "stdio.h"
+using namespace std;
+using namespace cv;
+
+//直方图均衡化
+Mat Histogramequalization(Mat src) {
+    int R[256] = {0};
+    int G[256] = {0};
+    int B[256] = {0};
+    int rows = src.rows;
+    int cols = src.cols;
+    int sum = rows * cols;
+    //统计直方图的RGB分布
+    for (int i = 0; i < rows; i++) {
+        for (int j = 0; j < cols; j++) {
+            B[src.at<Vec3b>(i, j)[0]]++;
+            G[src.at<Vec3b>(i, j)[1]]++;
+            R[src.at<Vec3b>(i, j)[2]]++;
+        }
+    }
+    //构建直方图的累计分布方程，用于直方图均衡化
+    double val[3] = {0};
+    for (int i = 0; i < 256; i++) {
+        val[0] += B[i];
+        val[1] += G[i];
+        val[2] += R[i];
+        B[i] = val[0] * 255 / sum;
+        G[i] = val[1] * 255 / sum;
+        R[i] = val[2] * 255 / sum;
+    }
+    //归一化直方图
+    Mat dst(rows, cols, CV_8UC3);
+    for(int i = 0; i < rows; i++){
+        for(int j = 0; j < cols; j++){
+            dst.at<Vec3b>(i, j)[0] = B[src.at<Vec3b>(i, j)[0]];
+            dst.at<Vec3b>(i, j)[1] = B[src.at<Vec3b>(i, j)[1]];
+            dst.at<Vec3b>(i, j)[2] = B[src.at<Vec3b>(i, j)[2]];
+        }
+    }
+    return dst;
+}
+
+int main(){
+    Mat src = imread("../1.jpg");
+    Mat dst = Histogramequalization(src);
+    imshow("origin", src);
+    imshow("result", dst);
+    imwrite("../result.jpg", dst);
+    waitKey(0);
+    return 0;
+}

Correction algorithm/README.md

@@ -1,4 +1,6 @@
 # OpenCV 和 C++ 实现一些矫正算法
 
-- GammaCorrection.cpp Gamma矫正C++实现，原理附在了代码中
+- GammaCorrection.cpp Gamma 矫正C++实现。原理附在了代码中
+
+- HistograEqualization.cpp 直方图均衡化C++实现。原理请看：https://blog.csdn.net/just_sort/article/details/85013803