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Re: How to detect edge of an image in IDL? [message #35621]

Mon, 30 June 2003 06:26

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

TIAN Yunfeng writes:

> I wonder if there are routines doing edge detection in IDL. I look
> through the IDL Online Help, and only find two simple edge enhancement
> functions (sobel & roberts). I want to use Gauss-Laplacian or Canny
> edge operators to get binary edge images. Does someone have any ideas?

You can use the CONVOL function to implement Laplacian
edge detection in IDL. You can find a very simple
example of using Laplacian edge detection to sharpen
an image in this article:

http://www.dfanning.com/ip_tips/sharpen.html

I've never used a Canny filter in IDL, but I think
it could be created if you can't find someone who
has already done it. I suspect both the Gauss-Lbplacian
and the Canny filters are two step processes in which
a gaussian filter is applied, followed by the Laplacian.
You ought to be able to do both with the CONVOL function.

Cheers,

David

--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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		Re: How to detect edge of an image in IDL? By: David Fanning on Mon, 30 June 2003 06:26
		Re: How to detect edge of an image in IDL? By: Johan Marais on Fri, 25 July 2003 07:14

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