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Coding Method for Quantized Color Image

IP.com Disclosure Number: IPCOM000057624D
Original Publication Date: 1988-Jun-01
Included in the Prior Art Database: 2005-Feb-15

Publishing Venue

IBM

Related People

Authors:
Hashihara, H Ioka, M [+details]

Abstract

This article describes an information preserving/lossless coding method for quantized color image using the characteristics of quantization. Color Look-Up Table (CLUT) architecture is adopted in many graphic display systems. In CLUT architecture, the value of each pixel of quantized image points to an entry in the CLUT, and the output from the CLUT is sent to a D/A converter as R, G, B signals. This article describes a coding method for quantized image, not a quantization algorithm. The method preserves information coding, and consists of the following process. 1.adopt run length coding 2.refer to the previous line 3.re-arrange CLUT according to the brightness of each entry, and adopt predictive coding (Image Omitted) Run length coding The length of a run of pixels which continue at the same value in a line is coded.