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How to select and crop a particular region from the image?

Asked by Jonathan on 18 Aug 2015
Latest activity Commented on by piku mandal on 1 Oct 2018
After some filtering, I manage to get this image,
My question is, how do you select and hopefully crop the region of interest? So I can get something like this.
Many thanks,

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1 Answer

Answer by blaat
on 18 Aug 2015
Edited by blaat
on 18 Aug 2015
 Accepted Answer

If you have the Image Processing Toolbox, you can use the function imrect() to select a rectangular area from your image. For example:
figure;
imshow(img);
h_rect = imrect();
% Rectangle position is given as [xmin, ymin, width, height]
pos_rect = h_rect.getPosition();
% Round off so the coordinates can be used as indices
pos_rect = round(pos_rect);
% Select part of the image
img_cropped = img(pos_rect(2) + (0:pos_rect(4)), pos_rect(1) + (0:pos_rect(3)));

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but how to use it for live images that is come from camera?

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