Remove Background from image and select the region of interest

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I have a image
and I want to remove the background and select the region of interest and my output should be
How can I do it ? thanks in advance.

Accepted Answer

Image Analyst
Image Analyst on 14 Feb 2014
For this image, the background is neutral and the subject is not. So I'd probably convert to hsv with rgb2hsv() and then threshold on saturation to get highly saturated pixels. The background won't get selected. Then get rid of any small regions with bwareaopen, call regionprops, get the bounding box, and call imcrop(). The essential lines are few:
hsv=rgb2hsv(rgbImage);
s = hsv(:,:,2);
foreground = s > 0.2; % Or whatever.
foreground = bwareaopen(foreground, 1000); % or whatever.
labeledImage = bwlabel(foreground);
measurements = regionprops(labeledImage, 'BoundingBox');
bb = measurements.BoundingBox;
croppedImage = imcrop(rgbImage, bb);
or something like that. I didn't test it - that's just off the top of my head.
  9 Comments
Animesh
Animesh on 18 Feb 2014
Edited: Animesh on 18 Feb 2014
I am trying to find the denomination of the note by using two features
1)Dominant color
2)Ratio of length/width.
And for the above I would take the dominant color as there are more of them.
Image Analyst
Image Analyst on 18 Feb 2014
Edited: Image Analyst on 18 Feb 2014
Sounds like just taking the mean color would be good enough to tell which note it is. I don't see any need to do anything fancier or more difficult.

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More Answers (1)

Anagha
Anagha on 15 Apr 2014
Hello,
I'm also facing similar problem. I want to crop the egg image from black background for further image processing. I'm attaching the image. Please help me in this regard. Really urgent!!
  1 Comment
Image Analyst
Image Analyst on 15 Apr 2014
Please start your own thread. Post your image there and explain why you want to crop. Cropping is not necessary for analysis, so why do you want to crop? Answer in your own, new thread, not here.

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