1 /**
2 * @file copyMakeBorder_demo.cpp
3 * @brief Sample code that shows the functionality of copyMakeBorder
4 * @author OpenCV team
5 */
6
7 #include "opencv2/imgproc.hpp"
8 #include "opencv2/imgcodecs.hpp"
9 #include "opencv2/highgui.hpp"
10
11 using namespace cv;
12
13 //![variables]
14 // Declare the variables
15 Mat src, dst;
16 int top, bottom, left, right;
17 int borderType = BORDER_CONSTANT;
18 const char* window_name = "copyMakeBorder Demo";
19 RNG rng(12345);
20 //![variables]
21
22 /**
23 * @function main
24 */
main(int argc,char ** argv)25 int main( int argc, char** argv )
26 {
27 //![load]
28 const char* imageName = argc >=2 ? argv[1] : "lena.jpg";
29
30 // Loads an image
31 src = imread( samples::findFile( imageName ), IMREAD_COLOR ); // Load an image
32
33 // Check if image is loaded fine
34 if( src.empty()) {
35 printf(" Error opening image\n");
36 printf(" Program Arguments: [image_name -- default lena.jpg] \n");
37 return -1;
38 }
39 //![load]
40
41 // Brief how-to for this program
42 printf( "\n \t copyMakeBorder Demo: \n" );
43 printf( "\t -------------------- \n" );
44 printf( " ** Press 'c' to set the border to a random constant value \n");
45 printf( " ** Press 'r' to set the border to be replicated \n");
46 printf( " ** Press 'ESC' to exit the program \n");
47
48 //![create_window]
49 namedWindow( window_name, WINDOW_AUTOSIZE );
50 //![create_window]
51
52 //![init_arguments]
53 // Initialize arguments for the filter
54 top = (int) (0.05*src.rows); bottom = top;
55 left = (int) (0.05*src.cols); right = left;
56 //![init_arguments]
57
58 for(;;)
59 {
60 //![update_value]
61 Scalar value( rng.uniform(0, 255), rng.uniform(0, 255), rng.uniform(0, 255) );
62 //![update_value]
63
64 //![copymakeborder]
65 copyMakeBorder( src, dst, top, bottom, left, right, borderType, value );
66 //![copymakeborder]
67
68 //![display]
69 imshow( window_name, dst );
70 //![display]
71
72 //![check_keypress]
73 char c = (char)waitKey(500);
74 if( c == 27 )
75 { break; }
76 else if( c == 'c' )
77 { borderType = BORDER_CONSTANT; }
78 else if( c == 'r' )
79 { borderType = BORDER_REPLICATE; }
80 //![check_keypress]
81 }
82
83 return 0;
84 }
85