comp.lang.idl-pvwave archive: archive » Thinning algorithm without for loops

Home » Public Forums » archive » Thinning algorithm without for loops

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Thinning algorithm without for loops [message #55233]

Mon, 06 August 2007 12:31

nathan12343
Messages: 14
Registered: August 2007

Junior Member

Hi all-

I'm trying to impliment the Zhang-Suen thinning algorithm in IDL.
This particular algorithm decides whether a pixel needs to be deleted
or not based on properties of the pixels immediately surrounding the
pixel we are concerned with (i.e. a pixel's 8-neighbors). This
naturally lends its self to for loops. Let's say I have an image, a
512X512 array of bytes. The code iteratively scans over each pixel
and determines whether it needs to be set to 0 based on the Zhang-Suen
thinning rules. What I can't figure out is how to scan the images
without for loops. If I use for loops I can easily index the pixels
immediately surrounding image[i,j] by saying image[i-1,j] or image[i
+1,j-1], etc.

Does anyone know of a way to do this kind of indexing in an image
without the use of for loops?

-Nathan Goldbaum

Report message to a moderator

[Message index]

		Thinning algorithm without for loops By: nathan12343 on Mon, 06 August 2007 12:31
		Re: Thinning algorithm without for loops By: JD Smith on Thu, 09 August 2007 09:52
		Re: Thinning algorithm without for loops By: nathan12343 on Wed, 08 August 2007 18:46
		Re: Thinning algorithm without for loops By: nathan12343 on Wed, 08 August 2007 10:41

Previous Topic:	indexing arrays with arrays
Next Topic:	Re: Mac OS x IDL font handling

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sat Nov 29 08:48:14 PST 2025

Total time taken to generate the page: 0.24079 seconds