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Proceedings Paper

Halftoning processing on a JPEG-compressed image
Author(s): Cedric Sibade; Stephane Barizien; Mohamed Akil; Laurent Perroton
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Paper Abstract

Digital image processing algorithms are usually designed for the raw format, that is on an uncompressed representation of the image. Therefore prior to transforming or processing a compressed format, decompression is applied; then, the result of the processing application is finally re-compressed for further transfer or storage. The change of data representation is resource-consuming in terms of computation, time and memory usage. In the wide format printing industry, this problem becomes an important issue: e.g. a 1 m2 input color image, scanned at 600 dpi exceeds 1.6 GB in its raw representation. However, some image processing algorithms can be performed in the compressed-domain, by applying an equivalent operation on the compressed format. This paper is presenting an innovative application of the halftoning processing operation by screening, to be applied on JPEG-compressed image. This compressed-domain transform is performed by computing the threshold operation of the screening algorithm in the DCT domain. This algorithm is illustrated by examples for different halftone masks. A pre-sharpening operation, applied on a JPEG-compressed low quality image is also described; it allows to de-noise and to enhance the contours of this image.

Paper Details

Date Published: 18 December 2003
PDF: 12 pages
Proc. SPIE 5293, Color Imaging IX: Processing, Hardcopy, and Applications, (18 December 2003); doi: 10.1117/12.527482
Show Author Affiliations
Cedric Sibade, Oce Print Logic Technologies (France)
Lab. S2SI/ESIEE (France)
Stephane Barizien, Oce Print Logic Technologies (France)
Mohamed Akil, Lab. A2SI/ESIEE (France)
Equipe BIOSEM/ESIEE (France)
Univ. Paris-XII Val-de-Marne (France)
Laurent Perroton, Lab. A2SI/ESIEE (France)

Published in SPIE Proceedings Vol. 5293:
Color Imaging IX: Processing, Hardcopy, and Applications
Reiner Eschbach; Gabriel G. Marcu, Editor(s)

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