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samples/cpp/tutorial_code/Histograms_Matching/EqualizeHist_Demo.cpp

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+/**
+ * @function EqualizeHist_Demo.cpp
+ * @brief Demo code for equalizeHist function
+ * @author OpenCV team
+ */
+
+#include "opencv2/imgcodecs.hpp"
+#include "opencv2/highgui.hpp"
+#include "opencv2/imgproc.hpp"
+#include <iostream>
+
+using namespace cv;
+using namespace std;
+
+/**
+ * @function main
+ */
+int main( int argc, char** argv )
+{
+    //! [Load image]
+    CommandLineParser parser( argc, argv, "{@input | lena.jpg | input image}" );
+    Mat src = imread( samples::findFile( parser.get<String>( "@input" ) ), IMREAD_COLOR );
+    if( src.empty() )
+    {
+        cout << "Could not open or find the image!\n" << endl;
+        cout << "Usage: " << argv[0] << " <Input image>" << endl;
+        return -1;
+    }
+    //! [Load image]
+
+    //! [Convert to grayscale]
+    cvtColor( src, src, COLOR_BGR2GRAY );
+    //! [Convert to grayscale]
+
+    //! [Apply Histogram Equalization]
+    Mat dst;
+    equalizeHist( src, dst );
+    //! [Apply Histogram Equalization]
+
+    //! [Display results]
+    imshow( "Source image", src );
+    imshow( "Equalized Image", dst );
+    //! [Display results]
+
+    //! [Wait until user exits the program]
+    waitKey();
+    //! [Wait until user exits the program]
+
+    return 0;
+
+}