Re: [WM]: Edge detection

["d s" <jullivan@hotmail.com>]

Some pointers:

-One of the best edge detectors is Canny's edge detector.
[A computational approach to edge detection, IEEE trans. Patt Recog and Mach 
Intell 36:961-1005-September 1986]
Other detectors have similar performance, although all of them
must be manually tuned to achieve optimal performance.

Matlab source for Canny can be found at 
http://robotics.eecs.berkeley.edu/~mayi/imgproc/
and C code at:
ftp://figment.csee.usf.edu/pub/Edge_Comparison/source_code/canny.src

A comparison of edge detectors can be found at
figment.csee.usf.edu/edge/edge_detection.html

You could also check out SUSAN algorithms which cover image noise filtering, 
edge finding and corner finding.
http://www.fmrib.ox.ac.uk/~steve/susan/

A pointer related to wavelets!:
- According to Mallat, the multiscale Canny edge detector
is equivalent to detecting modulus maxima in a wavelet tranform
[Characterization of signals from multiscale edges 14(7):710-732, July 1992]

Regards

...

--------------------------in reply to:-----------------
>From: Sugiri Pranata <sugiri@yahoo.com>
>To: <watermarking@watermarkingworld.org>
>Subject: [WM]: Edge detection
>Date: Tue, 3 Jul 2001 19:09:40 +0100 (BST)
>
>Dear all,
>
>Could anyone please share with me any reference, knowledge or source
>code on how to perform edge detection in spatial or frequency domain?
>
>Thanks in advance.
>
>Best regards,
>Sugiri


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