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find contoure [message #34038]

Thu, 13 February 2003 18:34

Thomas Gutzler
Messages: 44
Registered: November 2002

Member

Hi,

has somebody written (or knows where to find) an algorithm that finds
contours of a greyscaled image following this rules:
input: a starting-point (low brightness)
follow the contour assuming that the image is bright and the contour is
dark by proceding to the darkest pixel of all pixels having radius r
(r=5..10 would probably be a nice value).
I think of multiplying the image with a kernel (size 2*r x 2*r)
containing a circle of '1's to get the brightnessvalues.
Furthermore there must be a threshhold that stops the algorithm, if the
brightnessvalues get to high.
output: gathered points

I do not need a closed 'circle' like that being produced by davids
find_boundary - unfortunately :)

thx,
Tom

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