extrema1
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Name
extrema1 - detection of local minima and maxima
Syntax
extrema1 [-bg <bg>] [-fg <fg>] <inimage> <outimage>
Description
Local extrema (minima and maxima) are detected in
inimage, and marked in outimage with value fg,
foreground. All other pixels are marked bg,
background. If you need to distinguish between
minima and maxima, see extrema2.
The default for fg is 255, the bg default is 0.
See also
extrema1(3), extrema2(1), minima(1), maxima(1)
Restrictions
Supports ony unsigned byte images. bg and fg should
not be equal, and they should be in 0..255.
Reference
B.B. Chaudhuri and B.Uma Shankar:
"An efficient algorithm for extrema detection in
digital images"
Pattern Recognition Letters 10 (1989), 81-85.
Author
Tor L|nnestad, BLAB, ifi, UiO
Examples
extrema1 -fg 0 -bg 1 mona.img monaextrem.img
Id
$Id: extrema1.c,v 1.20 1996/11/08 14:03:21 svein Exp $