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Applied Optics

Applied Optics


  • Vol. 40, Iss. 29 — Oct. 10, 2001
  • pp: 5192–5205

Adaptive symmetric mean filter: a new noise-reduction approach based on the slope facet model

Huan-Chao Huang, Chung-Ming Chen, Sheng-De Wang, and Henry Horng-Shing Lu  »View Author Affiliations

Applied Optics, Vol. 40, Issue 29, pp. 5192-5205 (2001)

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Two new noise-reduction algorithms, namely, the adaptive symmetric mean filter (ASMF) and the hybrid filter, are presented in this paper. The idea of the ASMF is to find the largest symmetric region on a slope facet by incorporation of the gradient similarity criterion and the symmetry constraint into region growing. The gradient similarity criterion allows more pixels to be included for a statistically better estimation, whereas the symmetry constraint promises an unbiased estimate if the noise is completely removed. The hybrid filter combines the advantages of the ASMF, the double-window modified-trimmed mean filter, and the adaptive mean filter to optimize noise reduction on the step and the ramp edges. The experimental results have shown the ASMF and the hybrid filter are superior to three conventional filters for the synthetic and the natural images in terms of the root-mean-squared error, the root-mean-squared difference of gradient, and the visual presentation.

© 2001 Optical Society of America

OCIS Codes
(030.4280) Coherence and statistical optics : Noise in imaging systems
(100.0100) Image processing : Image processing
(100.2980) Image processing : Image enhancement

Original Manuscript: February 1, 2001
Revised Manuscript: July 13, 2001
Published: October 10, 2001

Huan-Chao Huang, Chung-Ming Chen, Sheng-De Wang, and Henry Horng-Shing Lu, "Adaptive symmetric mean filter: a new noise-reduction approach based on the slope facet model," Appl. Opt. 40, 5192-5205 (2001)

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