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From: sda@cs.exeter.ac.uk (Steven Dakin)
Newsgroups: comp.ai.neural-nets
Subject: Neural nets and edge detection
Message-ID: <14516.8811161059@expya.cs.exeter.ac.uk>
Date: 16 Nov 88 10:59:28 GMT
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	Recently I read an interesting article on applications of neural nets
in the field of visual edge detection. Basically it showed that single layer
nets couldn't be trained using a simple learning rule (eg. delta) to recognise
lines of various orientations. The problem is that a set of weights to 
recognise verticals destroy all the information about horizontality inherent
in the pattern of connectivity.The author proposed a solution using hidden
units.

	So far so good.

	However some months on, and I can't for the life of me remember 
the reference or the author. I have a feeling it may be unpublished, but if
anyone has come across this piece, or indeed any related work in the field,
please mail me.

	I'll compile and mail a list if there's enough.

                             Thanks.

                Steven Dakin (sda@uk.ac.exeter.cs)