NDLI: Lossless coding techniques for color graphical images

Content Provider	IEEE Xplore Digital Library
Author	Yovanof, G.S. Sullivan, J.R.
Copyright Year	1991
Description	Author affiliation: Eastman Kodak Co., Berkeley, CA, USA (Yovanof, G.S.)
Abstract	Summary form only given. Two types of images are considered: line-art images and computer generated graphics. The line art format specifies the standard representation format for digital images used in electronic pre-press systems. Colors are defined in a palette table that specifies the values of color components for each entry in the palette. The proposed techniques have been extended to full color graphics. The input data is transformed into color spaces which tend to concentrate a significant amount of the signal modulation into a single channel, thereby reducing the entropy in the other two channels. Each component channel is then processed by an independent spatial coder. A lower bound on the color entropy for the sample set of images is being derived by means of the optimal linear KL transformation to obtain the principal color components. An alternative method of compressing color graphics is described which utilizes a spatial DPCM codec operating directly on the composite color signal. Various approaches for determining the optimal values for the color correlation matrix are explored and comparisons made on the example image set.<>
File Size	54384
File Format	PDF
ISBN	0818692022
DOI	10.1109/DCC.1991.213322
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1991-04-08
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Image coding Art Computer graphics Color Performance loss Entropy Codecs Desktop publishing Explosions Data visualization
Content Type	Text
Resource Type	Article

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