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

/**

* @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

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。