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Proceedings Paper

Image quality improvement by pre- and post-processing in DCT coding
Author(s): Hiroshi Akitsu; Noboru Kutsuwada; Makoto Omodani; Yasushi Hoshino
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Paper Abstract

Coding for full-color still-image is standardized internationally by JPEG (Joint Photographic Experts Group). The coding method is used in wide area applications. In many cases, continuous-tone images are accompanied by characters. So improvements of JPEG coding by pre and post processing are investigated in mixed images. In this process, we use sharpening before JPEG coding as a pre-processing, and we use smoothing after JPEG coding as a post- processing. In both pre and post processing, the degree of emphasis is controlled by a weighting factor and the quality is compared between processed and unprocessed images. As a result of this process, it is confirmed that the processed image is better than an unprocessed image in quality.

Paper Details

Date Published: 18 June 1993
PDF: 9 pages
Proc. SPIE 1912, Color Hard Copy and Graphic Arts II, (18 June 1993); doi: 10.1117/12.146287
Show Author Affiliations
Hiroshi Akitsu, Nippon Institute of Technology (Japan)
Noboru Kutsuwada, Nippon Institute of Technology (Japan)
Makoto Omodani, Nippon Telegraph & Telephone Corp. (Japan)
Yasushi Hoshino, Nippon Telegraph & Telephone Corp. (Japan)

Published in SPIE Proceedings Vol. 1912:
Color Hard Copy and Graphic Arts II
Jan Bares, Editor(s)

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