opencv - 是否可以在图像中的一个点运行 filter2D(卷积)？

Question

我目前正在运行 filter2D将内核与图像进行卷积:

cv::filter2D(source, 
             dest, 
             CV_64F, 
             kernal, 
             cv::Point(-1,-1), 
             0, 
             cv::BORDER_CONSTANT);

但是，我对用内核对整个图像进行卷积不感兴趣，我只想在源图像上的给定像素处运行卷积。

这可能吗？

Answer 1

答案很简单，来自文档 enter link description here :

Note When the source image is a part (ROI) of a bigger image, the function will try to use the pixels outside of the ROI to form a border

所以解决方案是:

cv::Point point(x, y); 
Mat onePixelSourceROI(source, cv::Rect( point, cv::Size(1, 1) ));

cv::filter2D(onePixelSourceROI, 
             dest, 
             CV_64F, 
             kernal, 
             cv::Point(-1,-1), 
             0, 
             cv::BORDER_CONSTANT);