Cut an area in binary Image

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Nour
Nour on 21 Dec 2014
Commented: Image Analyst on 14 Feb 2015
Hi Everybody, Please, I would like to cut the white pixels area from a binary image, so that the output will be this white area. From another question, I see a method that shows how to surround this area, but also I would like to cut automatically the part surrounded, which is a vehicle logo in my case. Here is the link to this method: http://www.mathworks.com/matlabcentral/answers/24041-cut-an-image
I've tried this method for some hours, and trying to edit it to see the results, but until now I even didnt get the surrounded line, please your help is welcome.
Thanks!
Nour.
  1 Comment
Nour
Nour on 21 Dec 2014
Edited: Nour on 21 Dec 2014
Here is what I expect as output

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Accepted Answer

Image Analyst
Image Analyst on 21 Dec 2014
There are several ways to crop the image. For example you can use regionprops() to find the bounding box, like I show in my Image Segmentation Tutorial http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862.
Or you could simply find the min and max rows and columns:
[rows, columns] = find(binaryImage);
topRow = min(rows);
bottomRow = max(rows);
leftColumn = min(columns);
rightColumn = max(columns);
croppedImage = binaryImage(topRow:bottomRow, leftColumn:rightColumn);
You could also find the bounding box by summing vertically and horizontally and then using find() like above.
  14 Comments
Nour
Nour on 14 Feb 2015
Hi, I've tried export_fig() few days ago, but I got some errors, actually I think I don't understand how to use it, please if you can help me with that.
Which File Exchange?
Thanks!
Image Analyst
Image Analyst on 14 Feb 2015
You can contact him at his web site with any error messages: http://undocumentedmatlab.com/blog/export_fig

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