Segmentation-assisted compression of multimedia documents

Block-based compression algorithms have found widespread use in image and video compression standards. Algorithms such as JPEG, however, while very effective in compressing continuous tone images, do not perform well in compressing multimedia documents which contain text and graphics. With a growing...

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Veröffentlicht in:Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers Jg. 2; S. 1452 - 1456 vol.2
1. Verfasser: Chaddha, N.
Format: Tagungsbericht
Sprache:Englisch
Veröffentlicht: IEEE 1995
Schlagworte:
Compression algorithms
Discrete cosine transforms
Entropy
Facsimile
Graphics
Image coding
Image segmentation
Quantization
Transform coding
Video compression
ISBN:9780818673702, 0818673702
ISSN:1058-6393
Online-Zugang:Volltext
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Zusammenfassung:Block-based compression algorithms have found widespread use in image and video compression standards. Algorithms such as JPEG, however, while very effective in compressing continuous tone images, do not perform well in compressing multimedia documents which contain text and graphics. With a growing number of applications using images with a high content of both continuous tone data and text, e.g. color facsimile data and educational videos, requires the need for a good compression algorithm. In this paper we present a modified JPEG algorithm for compressing such mixed-mode images which occur in multimedia documents. The algorithm is based on the classification of a block as a kind of text or an image block depending on its DCT coefficients. There can be anywhere from 2 to 256 classes. With such a classification, the same compression algorithm can be applied except that different quantization matrices are used for the different type of blocks. The compression algorithm also uses different entropy codes for the different type of blocks. Simulation results show that the modified JPEG algorithm achieves upto 3 dB gain in PSNR compared to JPEG on multimedia documents.
ISBN:9780818673702
0818673702
ISSN:1058-6393
DOI:10.1109/ACSSC.1995.540938