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Author: yashk2000

hisEqualMyAlgo.cpp

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+#include <iostream>
+#include <opencv2/highgui/highgui.hpp>
+#include <opencv2/imgproc/imgproc.hpp>
+
+int main(int argc, char** argv) {
+    
+    cv::Mat img = cv::imread(argv[1], cv::IMREAD_GRAYSCALE);
+    
+    int freq[256] = {0};
+    for(int i = 0; i < img.rows; ++i) {
+        for(int j = 0; j < img.cols; ++j) {
+            freq[(int)img.at<uchar>(i, j)]++;
+        }
+    }
+    
+    int size = img.rows * img.cols;
+    double sf = 255.0 / size;
+    
+    int cumfreq[256] = {0};
+    cumfreq[0] = freq[0];
+    for(int i = 1; i < 255; ++i) {
+        cumfreq[i] = freq[i] + cumfreq[i-1];
+    }
+    
+    int scale[256] = {0};
+    for(int i = 0; i < 255; ++i) {
+        scale[i] = cvRound((double)cumfreq[i] * sf);
+    }
+    
+    cv::Mat equalizedImg = img.clone();
+    
+    for(int i = 0; i < img.rows; ++i) {
+        for(int j = 0; j < img.cols; ++j) {
+            equalizedImg.at<uchar>(i, j) = cv::saturate_cast<uchar>(scale[img.at<uchar>(i, j)]);
+        }
+    }
+    
+    cv::namedWindow("Original image in greyscale", cv::WINDOW_AUTOSIZE);
+    cv::imshow("Original image in greyscale", img);
+    
+    cv::namedWindow("Equalized image", cv::WINDOW_AUTOSIZE);
+    cv::imshow("Equalized image", equalizedImg);
+    
+    cv::waitKey(0);
+    return 0;
+}
+            
+