目标：
基于OpenCV的函数cv::copyMakeBorder给图像添加边框
函数简介：
copyMakeBorder( src, dst, top, bottom, left, right, borderType, value );
参数:
src: 原图像
dst: 目标图像
top, bottom, left, right: 每一个边界方向上像素的宽度.在这里使用图像原始大小的 5% .
borderType:边框的类型 。当前例子中位纯色或者边界的复制.
value: 如果borderType 设置位 BORDER_CONSTANT, 这个将作为边框的颜色.
边框的类型
1）纯色边框
BORDER_CONSTANT，边框设置位某种单一的颜色，比如黑色
2）图像边界扩展
BORDER_REPLICATE，复制原图的边界进行扩展
代码
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/** * @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 image if( src.empty() ) { printf(" No data entered, please enter the path to an image file \n"); return -1; } //![load] /// Brief how-to for this program printf( "\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 filter top = (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
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原文链接：https://blog.csdn.net/Real_Myth/article/details/53112259?utm_source=blogxgwz4
