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    • 1. 发明授权
    • System and method for compressing color data using expandable color palette
    • 使用可扩展调色板压缩色彩数据的系统和方法
    • US07091985B1
    • 2006-08-15
    • US09571790
    • 2000-05-16
    • Timothy Leroy TownsJohn T. Varga
    • Timothy Leroy TownsJohn T. Varga
    • G09G5/02
    • H04N1/644G09G5/06
    • A method, apparatus, and information bearing medium for compressing color utilizes an expandable color palette for storing a pre-established number of n-bit color codes. Each of the n-bit color codes maps to an m-bit color value, where m is an integer greater than n. Up to the pre-established number of n-bit color codes are stored in a first palette table of the color palette. The color palette is expanded to include up to a specified number of palette tables for storing sets of the pre-established number of n-bit color codes. The pre-established number of n-bit color codes is characterized by 2n−1 color codes. The color palette is expanded to include up to (m/n)−1 palette tables for storing sets of 2n−1 color codes. Each of the palette tables is associated with a pixel table which stores a linking value for associating a particular palette table to a subsequently generated palette table.
    • 用于压缩颜色的方法,装置和信息承载介质利用可扩展调色板来存储预先确定的数量的n位颜色代码。 每个n位颜色代码映射到m位颜色值,其中m是大于n的整数。 直到预先确定的n位颜色代码被存储在调色板的第一调色板表中。 调色板被扩展以包括指定数量的调色板表,用于存储预先确定的n位颜色代码的集合。 预先确定的n位颜色代码的数量由2×n×1个颜色代码表征。 调色板被扩展为包括最多(m / n)-1个调色板表,用于存储2个 n -1个颜色代码的集合。 每个调色板表与存储用于将特定调色板表与随后生成的调色板表相关联的链接值的像素表相关联。