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Efficient hybrid image coding scheme for color facsimile

โœ Scribed by Satoshi Katsuno; Atsushi Koike; Yoshinori Hatori; Toshiaki Endoh

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
796 KB
Volume
79
Category
Article
ISSN
8756-6621

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โœฆ Synopsis

The international standard coding scheme for continuous-tone still images, JPEG, is not suitable for images that include characters and multicolor areas.

When such images are encoded with joint photographic experts group (JPEG), the quality of the decoded images is heavily degraded. A hybrid coding scheme is proposed that combines JPEG and joint bilevel experts group (JBIG) to solve this problem. With this coding scheme, charactes and multicolm areas are subtracted from an original image and cuded with a JBIG and DPCM coding scheme. The subtracted continuous-tone areas in this image are coded with a JPEG coding scheme. In this paper, experimental results using several kinds of test images show that the proposed method improves the quality of the decoded image much more than the JPEG coding scheme does.

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