感兴趣的区域opencv python [英] Region of Interest opencv python

问题描述

我正在尝试使用opencv python获取图像区域（ROI）。使用的opencv版本是2.4.3。但是，当我尝试调用API

I am trying to get a region of an image (ROI) using opencv python. THe version of opencv used is 2.4.3. However when I try to call the API

cv2.SetImageROI

它返回错误

AttributeError: 'module' object has no attribute 'SetImageROI'

此外，在检查文档时，似乎建议这个api是遗留的python函数。
http://docs.opencv.org/2.4.3 /search.html?q=setimageroi

Also on checking the documentation it seems to suggest this api is a legacy python function. http://docs.opencv.org/2.4.3/search.html?q=setimageroi

我不知道如何在python中使用当前版本的opencv获取ROI。有人可以建议如何解决这个问题吗？

I am not sure how to go about getting the ROI using this current version of opencv in python. Could some one please suggest how to go about this?

谢谢

推荐答案

好的，进一步的分析认识到cv2因为它一直支持numpy数组结构，所以不再需要一个API，整个图像可以在数组本身中进行操作。
例如：

Okay, On further analysis realized that the cv2 since it has been supporting numpy array structure, there is no longer any need for a API, the entire image can be manipulated in the array itself. eg:

img = cv2.imread('image.png')
img = img[c1:c1+25,r1:r1+25]

这里c1是左侧列像素位置，r1是对应的行位置。 img现在将像素中指定的图像作为ROI。

Here c1 is the left side column pixel location, and r1 is the corresponding row location. And img now has the image specified within the pixels as the ROI.

编辑：
这里非常好地解释，如何在python中使用opencv复制图像区域？

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