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Proceedings Paper

Comparison of methods to treat nonuniform illumination in images
Author(s): Timothy P. McDonald; Yud-Ren Chen
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Paper Abstract

The effects of removing illumination gradients on the spatial distribution characteristics of visible fat within beef longissimus dorsi muscle were investigated. Gradients were assumed to be slowly varying and were removed by subtracting a smoothed version of the image from the original. Two types of filters were used to smooth the images: a linear lowpass filter and a greyscale morphological opening. The effects of the two filters on the binary images after thresholding using a Boolean random set model were investigated. Results showed that the choice of filter significantly influenced model parameter estimates. It was concluded that the morphological filter provided the most consistent means of eliminating adverse effects of illumination gradients. 1.

Paper Details

Date Published: 1 February 1991
PDF: 10 pages
Proc. SPIE 1379, Optics in Agriculture, (1 February 1991); doi: 10.1117/12.25078
Show Author Affiliations
Timothy P. McDonald, U.S. Dept. of Agriculture (United States)
Yud-Ren Chen, U.S. Dept. of Agriculture (United States)


Published in SPIE Proceedings Vol. 1379:
Optics in Agriculture
James A. DeShazer; George E. Meyer, Editor(s)

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