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Re: Edge detection algorithm

Try scanning all 8 pixels in the vicinity of the current pixel and if you
find that two adjacent pixels are of different colours (i.e. B&W) then you
know that you have found the next edge step you should be looking at.

Roy

"Peter Lundh" <simran@teleline.es> wrote in message
news:yaf3q3etxb1q@legacy...
> I have a bitmap image of a white (spherical) shape on a black
> background. I would like to create a loop that would find a random
> edge, or contour pixel of the shape, perform a computation and then
> move on to the next edge pixel in a clockwise fashion. 1) How should I
> find the first edge pixel. 2) How should I design the loop so that it
> moves on to the next edge pixel until it reaches the first pixel?
>
> Many thanks in advance.
>
> -Peter
>


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