🚀 go-pugleaf

In article <1992Jul27.021555.24987@cs.brown.edu>, jle@dam.brown.edu (Jon Elion) writes:
|> Would be interested in from anyone who has experience with image
|> filtering techniques for noise reduction that simultaneously ENHANCE
|> edges.  Normally, these two operations are mutually exclusive (as
|> noise reduction can tend to BLUR edges, not sharpen them).  There
|> exist non-linear approaches that achieve this goal (although
|> tending to be computationally very intensive).
|> 
	I had good success with the modified trimmed mean (MTM) filter :

Y H Lee & S A Kassam - Generalized Median Filtering and Related Nonlinear
Filtering Techniques, IEEE Trans. Acoustics Speech & Signal Processing, vol. 33,
no. 3, June 1985, pp 672 - 683.

	This is compared with other, similar, techniques in :

Y-H Lee & S Tantaratana - Decision-Based Order Statistics, IEEE Trans. ASSP, 
vol. 38, no. 3, March 1990, pp 406 - 420.

	As originally formulated the filter is one dimensional (and this is the
form in which I used it), but the second paper shows results of its use in 2-D,
presumably by applying it in one direction and then the other.


								Philip J. Naylor.