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samples/cpp/tutorial_code/ImgTrans/Remap_Demo.cpp

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+/**
+ * @function Remap_Demo.cpp
+ * @brief Demo code for Remap
+ * @author Ana Huaman
+ */
+
+#include "opencv2/imgcodecs.hpp"
+#include "opencv2/highgui.hpp"
+#include "opencv2/imgproc.hpp"
+#include <iostream>
+
+using namespace cv;
+
+/// Function Headers
+void update_map( int &ind, Mat &map_x, Mat &map_y );
+
+/**
+ * @function main
+ */
+int main(int argc, const char** argv)
+{
+    CommandLineParser parser(argc, argv, "{@image |chicky_512.png|input image name}");
+    std::string filename = parser.get<std::string>(0);
+    //! [Load]
+    /// Load the image
+    Mat src = imread( samples::findFile( filename ), IMREAD_COLOR );
+    if (src.empty())
+    {
+        std::cout << "Cannot read image: " << filename << std::endl;
+        return -1;
+    }
+    //! [Load]
+
+    //! [Create]
+    /// Create dst, map_x and map_y with the same size as src:
+    Mat dst(src.size(), src.type());
+    Mat map_x(src.size(), CV_32FC1);
+    Mat map_y(src.size(), CV_32FC1);
+    //! [Create]
+
+    //! [Window]
+    /// Create window
+    const char* remap_window = "Remap demo";
+    namedWindow( remap_window, WINDOW_AUTOSIZE );
+    //! [Window]
+
+    //! [Loop]
+    /// Index to switch between the remap modes
+    int ind = 0;
+    for(;;)
+    {
+        /// Update map_x & map_y. Then apply remap
+        update_map(ind, map_x, map_y);
+        remap( src, dst, map_x, map_y, INTER_LINEAR, BORDER_CONSTANT, Scalar(0, 0, 0) );
+
+        /// Display results
+        imshow( remap_window, dst );
+
+        /// Each 1 sec. Press ESC to exit the program
+        char c = (char)waitKey( 1000 );
+        if( c == 27 )
+        {
+            break;
+        }
+    }
+    //! [Loop]
+    return 0;
+}
+
+/**
+ * @function update_map
+ * @brief Fill the map_x and map_y matrices with 4 types of mappings
+ */
+//! [Update]
+void update_map( int &ind, Mat &map_x, Mat &map_y )
+{
+    for( int i = 0; i < map_x.rows; i++ )
+    {
+        for( int j = 0; j < map_x.cols; j++ )
+        {
+            switch( ind )
+            {
+            case 0:
+                if( j > map_x.cols*0.25 && j < map_x.cols*0.75 && i > map_x.rows*0.25 && i < map_x.rows*0.75 )
+                {
+                    map_x.at<float>(i, j) = 2*( j - map_x.cols*0.25f ) + 0.5f;
+                    map_y.at<float>(i, j) = 2*( i - map_x.rows*0.25f ) + 0.5f;
+                }
+                else
+                {
+                    map_x.at<float>(i, j) = 0;
+                    map_y.at<float>(i, j) = 0;
+                }
+                break;
+            case 1:
+                map_x.at<float>(i, j) = (float)j;
+                map_y.at<float>(i, j) = (float)(map_x.rows - i);
+                break;
+            case 2:
+                map_x.at<float>(i, j) = (float)(map_x.cols - j);
+                map_y.at<float>(i, j) = (float)i;
+                break;
+            case 3:
+                map_x.at<float>(i, j) = (float)(map_x.cols - j);
+                map_y.at<float>(i, j) = (float)(map_x.rows - i);
+                break;
+            default:
+                break;
+            } // end of switch
+        }
+    }
+    ind = (ind+1) % 4;
+}
+//! [Update]