Finding connected pixels of an object from a starting pixel in a gray scale image

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Mary Ben
Mary Ben 2021-3-11
评论： Mary Ben 2021-3-15
Please I need your help.
Is there anyone who can help me to find connected pixels of an object from a gray scale image. I mean what is the method that I can use? (i,e In each iteation, a region is grown from the start seed pixel. the growth of reagion spreads across all
connecting pixels that are not already labeled and that are above the current threshold Th)
Thanks in advance

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回答（2 个）

Matt J
Matt J 2021-3-15
编辑：Matt J 2021-3-15
Once you threshold the image (making it binary) you can use regionprops or bwconncomp.
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Matt J
Matt J 2021-3-15
I don't think you'll find that in Matlab proper. You can look through some of the region growing routines on the File Exchange to see if any give you that kind of control,
https://www.mathworks.com/matlabcentral/fileexchange/19084-region-growing?s_tid=srchtitle
Mary Ben
Mary Ben 2021-3-15
I tried with this code that you attached and I made some changes, but the problem is that the region grows on the side of the background and not from the object!!

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Matt J
Matt J 2021-3-15
You could apply bwdist to find all pixels that are within some distance of the seed pixels, and bwdistgeodesic if you want to constrain that distance to certain paths.
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Mary Ben
Mary Ben 2021-3-15
with matlab I dont have any idea... with the last code of region growing i can select juste 1000 pixels but after run I obtain a grown region of background not for object that I want to detect.

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