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From: Priyanka Tiwari on 2 May 2010 09:55
hello sir,
i am working on segmentation of thread like objects in the image .but a lot of small loops and noise is present in the image .sir plz help me to remove all those small unwanted objects. i want only long threads to be present in the the output image.
sir plz help me
link to the image is this-

http://drop.io/seg_thread
From: ImageAnalyst on 2 May 2010 11:21
First use bwlabel and then call regionprops. Then use ismember to
filter on the ratio of perimeter squared to area. Thread-like
structures will have a high value for this ratio. You can also use
bwareaopen on the binary image prior to labeling, or use ismember on
the measured areas returned from regionprops, to get rid of small
ojbects - but that will get rid of small thread-like objects as well
unless you take special care with ismember to include the P^2/A ratio
in your exclusion criteria.

Go here for more info and an example on using ismember to filter
regionprops measurements:
http://www.mathworks.com/matlabcentral/fileexchange/25157
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