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Optical Engineering

Nonlinear Optical Image Filtering By Time-Sequential Threshold Decomposition
Author(s): James M. Hereford; William T. Rhodes
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Paper Abstract

Shape-changing, or morphological, transformations (e.g., erosion, dilation, median filtering, and other ranked-order filtering) on binary imagery can be obtained by optically convolving the input image with a disk or other binary spread function and thresholding the output. Gray-scale images can be processed if the input is decomposed into a sequence of binary "slices" by a variable thresholding operation (threshold decomposition). The slices undergo shape-changing transformations and are then added together to produce the output gray-scale image. Median filtering to remove "salt-and-pepper" noise from a gray-scale image is demonstrated. The use of gray-scale (as opposed to binary) convolution kernels allows extension of the method to a more general class of nonlinear filtering operations that includes stack filters.

Paper Details

Date Published: 1 April 1988
PDF: 6 pages
Opt. Eng. 27(4) 274274 doi: 10.1117/12.7976670
Published in: Optical Engineering Volume 27, Issue 4
Show Author Affiliations
James M. Hereford, Georgia Institute of Technology (United States)
William T. Rhodes, Georgia Institute of Technology (United States)

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