C++ 翻转图像以获得镜像效果

Flipping an image to get mirror effect

提问by ranger

I am working on a video processing project which needs some flipping of frame. I tried using cvFlip but doesnt seem to flip along y axis (x axis working...) and results in segmentation fault. Is there any other option??

我正在处理一个需要翻转帧的视频处理项目。我尝试使用 cvFlip 但似乎没有沿 y 轴翻转（x 轴工作...）并导致分段错误。还有其他选择吗？？

cv::Mat dst=src;      //src= source image from cam
cv::flip(dst, dst, 1);     //segmentation fault shown

imshow("flipped",dst);

回答by berak

cv::Mat src=imload("bla.png");
cv::Mat dst;               // dst must be a different Mat
cv::flip(src, dst, 1);     // because you can't flip in-place (leads to segfault)

回答by juanchopanza

Use cv::flipand pass 1as flipcode.

使用cv::flip并1作为flipcode.

Looking at your edit with the sample code, you cannot flip in place. You need a separate destination cv::Mat:

使用示例代码查看您的编辑，您无法原地翻转。您需要一个单独的目的地cv::Mat：

cv::Mat dst;
cv::flip(src, dst, 1);
imshow("flipped",dst);

回答by Eric

The key is to create the dstexactly like the src:

关键是创建dst完全类似于src：

cv::Mat dst = cv::Mat(src.rows, src.cols, CV_8UC3);
cv::flip(src, dst, 1);

imshow("flipped", dst);