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Proceedings Paper

Quality improvement of low-data-rate compressed video signals by pre- and postprocessing
Author(s): Robert Kutka; Andre Kaup; M. Hager
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Paper Abstract

In this paper a technique for improving the image quality of block-based video coders is presented which combines the following pre- and postprocessing steps: Before the coding process, the image sharpness is enhanced by applying a special prefilter to the original image. By this means a possible degradation of the image sharpness by the coder is compensated. The decoder output is smoothed by a lowpass filter which reduces artifacts such as block discontinuities. Secondly, the quantization error of the frequency DCT coefficients is reduced by predicting AC coefficients based on the mean values of the neighboring image blocks. This step improves the luminance function within the blocks. While the original sequences show coarse blocking patterns, the images processed by this technique look smooth on the overall with well-preserved local edge structures. The tool supports all standardized DCT codecs, such as MPEG-1/2 or H.261/3.

Paper Details

Date Published: 16 September 1996
PDF: 8 pages
Proc. SPIE 2952, Digital Compression Technologies and Systems for Video Communications, (16 September 1996); doi: 10.1117/12.251309
Show Author Affiliations
Robert Kutka, Siemens AG (Germany)
Andre Kaup, Siemens AG (Germany)
M. Hager, Technische Univ. Muenchen (Germany)


Published in SPIE Proceedings Vol. 2952:
Digital Compression Technologies and Systems for Video Communications

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