目標：

基于OpenCV的函數cv::copyMakeBorder給圖像添加邊框

函數簡介：

copyMakeBorder( src, dst, top, bottom, left, right, borderType, value ); 參數:

src: 原圖像

dst: 目標圖像

top, bottom, left, right: 每一個邊界方向上像素的寬度.在這里使用圖像原始大小的 5% .

borderType:邊框的類型 。當前例子中位純色或者邊界的復制.

value: 如果borderType 設置位 BORDER_CONSTANT, 這個將作為邊框的顏色.

邊框的類型

1）純色邊框

??? BORDER_CONSTANT，邊框設置位某種單一的顏色，比如黑色

2）圖像邊界擴展

BORDER_REPLICATE，復制原圖的邊界進行擴展

代碼

/*** @file copyMakeBorder_demo.cpp* @brief Sample code that shows the functionality of copyMakeBorder* @author OpenCV team*/#include "opencv2/imgproc.hpp" #include "opencv2/imgcodecs.hpp" #include "opencv2/highgui.hpp"using namespace cv;//![variables] Mat src, dst; int top, bottom, left, right; int borderType; const char* window_name = "copyMakeBorder Demo"; RNG rng(12345); //![variables]/*** @function main*/ int main( int, char** argv ) {int c;//![load]src = imread( argv[1], IMREAD_COLOR ); // Load an imageif( src.empty() ){printf(" No data entered, please enter the path to an image file \n");return -1;}//![load]/// Brief how-to for this programprintf( "\n \t copyMakeBorder Demo: \n" );printf( "\t -------------------- \n" );printf( " ** Press 'c' to set the border to a random constant value \n");printf( " ** Press 'r' to set the border to be replicated \n");printf( " ** Press 'ESC' to exit the program \n");//![create_window]namedWindow( window_name, WINDOW_AUTOSIZE );//![create_window]//![init_arguments]/// Initialize arguments for the filtertop = (int) (0.05*src.rows); bottom = (int) (0.05*src.rows);left = (int) (0.05*src.cols); right = (int) (0.05*src.cols);//![init_arguments]dst = src;imshow( window_name, dst );for(;;){//![check_keypress]c = waitKey(500);if( (char)c == 27 ){ break; }else if( (char)c == 'c' ){ borderType = BORDER_CONSTANT; }else if( (char)c == 'r' ){ borderType = BORDER_REPLICATE; }//![check_keypress]//![update_value]Scalar value( rng.uniform(0, 255), rng.uniform(0, 255), rng.uniform(0, 255) );//![update_value]//![copymakeborder]copyMakeBorder( src, dst, top, bottom, left, right, borderType, value );//![copymakeborder]//![display]imshow( window_name, dst );//![display]}return 0; }

效果

總結

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