如何在OpenCV中裁剪CvMat? [英] How to crop a CvMat in OpenCV?

问题描述

我将图像转换为CvMat矩阵，例如CVMat source.从source获得感兴趣的区域后，我希望将算法的其余部分仅应用于该感兴趣的区域.为此，我认为我必须以某种方式裁剪无法执行的source矩阵.是否存在可以裁剪CvMat矩阵并返回另一个裁剪的CvMat矩阵的方法或函数?谢谢.

I have an image converted in a CvMat Matrix say CVMat source. Once I get a region of interest from source I want the rest of the algorithm to be applied to that region of interest only. For that I think I will have to somehow crop the source matrix which I am unable to do so. Is there a method or a function that could crop a CvMat Matrix and return another cropped CvMat matrix? thanks.

推荐答案

OpenCV具有感兴趣的区域功能，您可能会发现它很有用.如果您使用的是cv::Mat，则可以使用以下内容.

OpenCV has region of interest functions which you may find useful. If you are using the cv::Mat then you could use something like the following.

// You mention that you start with a CVMat* imagesource
CVMat * imagesource;

// Transform it into the C++ cv::Mat format
cv::Mat image(imagesource); 

// Setup a rectangle to define your region of interest
cv::Rect myROI(10, 10, 100, 100);

// Crop the full image to that image contained by the rectangle myROI
// Note that this doesn't copy the data
cv::Mat croppedImage = image(myROI);

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