I have an image and want to make a rectangle around black part which is in the middle of image.

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abhishek
abhishek on 23 Jun 2014
Edited: abhishek on 26 Jun 2014
I have an image and want to make a rectangle around black part which is in the middle of image.

Answers (2)

Dishant Arora
Dishant Arora on 23 Jun 2014
Go for connected component labelling and check out for bounding boxes parameter, plot it. For more information check out this demo by image analyst Image Segmentation Tutorial ("BlobsDemo")
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abhishek
abhishek on 23 Jun 2014
sir i tried that code but its not working as i want. I tried bounding box, regionprops etc. but failed. so plz can you simply make some code for this situation.

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Image Analyst
Image Analyst on 23 Jun 2014
What are you starting with? A gray scale image, or that binary image? If you have that binary image, you might want to call imclose() to connect some regions together, then call bwareaopen() to get rid of small noise regions, Then call regionprops and get the centroids and bounding boxes. Find the centroid closest to the center of the image and extract only that one with ismember.
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abhishek
abhishek on 26 Jun 2014
hello sir. how can i find out the black pixel locations in an image and distance between center to that point.

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