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Region of Interest opencv python

Tags:

python

image

image-processing

opencv

roi

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

it returns this error

AttributeError: 'module' object has no attribute '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

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?

Thanks

like image 544
Ajay Nair Avatar asked Mar 15 '13 04:03

Ajay Nair

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1 Answers

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]

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.

EDIT: Very nicely explained here, How to copy a image region using opencv in python?

like image 184
Ajay Nair Avatar answered Sep 20 '22 02:09

Ajay Nair
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