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perimeter of a blob [message #18634]

Wed, 26 January 2000 00:00

Ben Tupper
Messages: 186
Registered: August 1999

Senior Member

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I am looking for an efficient means of finding the perimeter of contiguous
blobs of pixels within an image.   These blobs are the regions
returned by the LABEL_REGION function.  I have been using the trusty
brute-force-and-ignorance appraoch where I scan rows and columns within
each blob,  recording the min and max coordinates of each row/column.  
It is a cumbersome task and leaves gaps in certain areas (especially concavities
in the blob.)
I'ld like to try something that does the following:
    Input  image and blob info  -> Something
mysterious happens inside the computer -> Output the index values of the
perimeter of the blob
I think this closely approximates the reverse of POLYFILLV (pretty close
anyhow.)
Any suggestions?
Thanks in advance,
Ben
<pre>-- 
Ben Tupper

Bigelow Laboratory for Ocean Science
tupper@seadas.bigelow.org

pemaquidriver@tidewater.net</pre>
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[Message index]

		perimeter of a blob By: Ben Tupper on Wed, 26 January 2000 00:00
		Re: perimeter of a blob By: Ben Tupper on Thu, 27 January 2000 00:00
		Re: perimeter of a blob By: davidf on Thu, 27 January 2000 00:00
		Re: perimeter of a blob By: Richard Adams on Thu, 27 January 2000 00:00

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