Question

Mat img = imread(input);

// Crop a part out of the image
img = img(Rect(x, y, width, height));

// Add a white border around the cropped image
int border = 100;
copyMakeBorder(img, img, border, border, border, border, BORDER_CONSTANT, Scalar(0, 255, 255));

我遇到了问题..我需要为图片添加边框..

但首先我必须裁掉一些内容..

问题是，之后添加边框时我刚裁剪的内容会重新出现..

有可能以某种方式提交＆＃34;提交＆＃34;在添加边框之前进行裁剪后的更改？

Answer 1

您应该使用新的Mat并克隆投资回报率。

#include "opencv2/highgui.hpp"
using namespace cv;

int main(int argc, char* argv[])
{
    Mat img = imread(argv[1]);

    // Crop a part out of the image
    Mat cropped = img(Rect(10, 10, 100, 100)).clone();

    // Add a white border around the cropped image
    int border = 100;
    copyMakeBorder(cropped, cropped, border, border, border, border, BORDER_CONSTANT, Scalar(0, 255, 255));
    imshow("cropped", cropped);
    waitKey();
    return 0;
}

裁剪图像然后添加边框

1 个答案: