1 July 1990 Some uses for order statistic filtering in image compression
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Abstract
This paper discusses two examples of the design and use of order statistic filters in image compression. The first example is a pre-filter. The pre-filter is designed to gently smooth the image to promote better compression. However, this filter must not blur edges significantly. Various order statistic estimators, such as a simple median, are ideal at this. In the examples given, we are able to achieve between 10 and 20% fewer bits while actually improving image quality. The second example is as a postfilter. The post-filter, used at low bitrates when image degradation is present, is designed to "average out" contouring effects while not averaging across edges.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Charles G. Boncelet, "Some uses for order statistic filtering in image compression", Proc. SPIE 1247, Nonlinear Image Processing, (1 July 1990); doi: 10.1117/12.19596; https://doi.org/10.1117/12.19596
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