Morphological closing to crop an image
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Matthew Alston
on 18 Jun 2014
Commented: Matthew Alston
on 18 Jun 2014
Hi,
I'm trying to use the image processing toolbox to remove extraneous pixels from an image and I'm running into trouble. Basically I have a painmap (attached), which is a blank sheet of paper with a black body template on it, and a patient can draw in red marker over the areas of the body that cause them pain. However, often patients will draw outside of the lines and these are the pixels I'd like to crop out: everything outside of the black body outline. A friend suggested I use morphological closing to accomplish this but I'm not sure how to go about doing this. If anyone has any ideas they would be much appreciated.
Thanks, Matt
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Image Analyst
on 18 Jun 2014
No that does not sound right. You'd use masking, assuming you have the original body outline. Closing will smooth out the white parts of the image. You didn't attach anything yet. Why don't you attach and image of the blank sheet, an image where the patient scribbled on it, and what you'd like that image to look like after processing?
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Image Analyst
on 18 Jun 2014
The problem was that the outline was not completely closed - it had gaps so the body did not fill in. I used imclose to fill the gaps. See attached m-file.
![](https://www.mathworks.com/matlabcentral/images/broken_image.png)
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