A unified approach to noise removal, imageenhancement, and shape recovery
Malladi, R.
Sethian, J.A.
California Univ., Berkeley, CA, USA ;
This paper appears in: Image Processing, IEEE Transactions on Publication Date: Nov. 1996
Volume: 5
,
Issue: 11
On page(s):
1554
- 1568
ISSN: 1057-7149
Digital Object Identifier: 10.1109/83.541425
Current Version Published: 2002-08-06
Abstract
We present a unified approach to noise removal, imageenhancement, and shape recovery in images. The underlying approach relies on the level set formulation of the curve and surface motion, which leads to a class of PDE-based algorithms. Beginning with an image, the first stage of this approach removes noise and enhances the image by evolving the image under flow controlled by min/max curvature and by the mean curvature. This stage is applicable to both salt-and-pepper grey-scale noise and full-image continuous noise present in black and white images, grey-scale images, texture images, and color images. The noise removal/enhancement schemes applied in this stage contain only one enhancement parameter, which in most cases is automatically chosen. The other key advantage of our approach is that a stopping criteria is automatically picked from the image; continued application of the scheme produces no further change. The second stage of our approach is the shape recovery of a desired object; we again exploit the level set approach to evolve an initial curve/surface toward the desired boundary, driven by an image-dependent speed function that automatically stops at the desired boundary
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