copyMakeBorder

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

borderType有两种
- BORDER_CONSTANT
- BORDER_REPLICATE

#include 
#include 

using namespace cv;
using namespace std;
Mat src, dst;
int top0, bottom0, left0, right0;
int borderType;
Scalar value;
String window_name="copyMakeBorder Demo";
RNG rng(12345);

int main()
{
    Mat src=imread("image.jpg");
    int c;
    namedWindow(window_name,WINDOW_AUTOSIZE);
    top0=(int)(0.05*src.rows);
    bottom0=(int)(0.05*src.rows);
    left0=(int)(0.05*src.cols);
    right0=(int)(0.05*src.cols);

    dst=src;
    imshow(window_name,dst);
    while(true)
    {
        c=waitKey(500);
        if((char)c==27)
            break;
        else if((char)c=='c')
            borderType=BORDER_CONSTANT;
        else if((char)c=='r')
            borderType=BORDER_REPLICATE;

        value=Scalar(rng.uniform(0,255),rng.uniform(0,255),rng.uniform(0,255));
        copyMakeBorder(src,dst,top0,bottom0,left0,right0,borderType,value);

        imshow(window_name,dst);
    }
    return 0;
}

实验截图

以上两张为BORDER_CONSTANT结果

以上为BORDER_REPLICATE结果