gradInv
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Name
gradInv - gradient invers noise reduction
Syntax
gradInv <inimage> <outimage> [<dx> [<dy>]]
Description
Noise reduction by gradient invers smoothing.
dx is the horizontal window size. Default is 3.
dy is the vertical window size. Default is dx.
The image border is filtered as good as possible.
Restrictions
input and output must have pixel type unsigned byte.
dx and dy must be greater than 1.
If dx (or dy) are even, dx+1 (or dy+1) is used.
See also
gradInv(3)
References
-
Wang, Vagnucci and Li,
- "Gradient Inverse Weighted Smoothing Scheme and the Evaluation
of Its Performance",
Comp. Graph. and Im. Proc. 15, 167-181 (1981).
Author
Tor Lønnestad, BLAB, Ifi, UiO
Examples
gradInv mona.img monaGrad.img
gradInv mona.img monaGrad.img 5
gradInv mona.img monaGrad.img 5 7
Id
$Id: gradInv.c,v 1.22 1997/01/16 16:04:36 svein Exp $