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    • 10. 发明授权
    • Method for reducing data expansion during data compression
    • 减少数据压缩过程中数据扩展的方法
    • US06271775B1
    • 2001-08-07
    • US09379821
    • 1999-08-24
    • Glen A. JaquetteFrancis A. KampfOscar C. Strohacker
    • Glen A. JaquetteFrancis A. KampfOscar C. Strohacker
    • H03M700
    • H03M13/6312G06T9/005H03M7/00H03M7/3084H03M13/35
    • A method of reducing data expansion during data compression is provided that allows the coding scheme used to compress data to be swapped between two or more coding schemes. Specifically, a coding window is provided that allows analysis of the compression potential of data within the coding window. The data within the coding window then is analyzed to determine the compression potential of the data. If the compression potential of the data exceeds a first predetermined value, the coding scheme used to compress the data within the coding window is swapped from one coding scheme to another. Preferably the first predetermined value is programmable and is related to the bit cost required to swap back and forth between coding schemes. The two preferred coding schemes are ALDC Lempel-Ziv 1 coding and a pass-through coding scheme wherein raw data is passed unencoded.
    • 提供了一种在数据压缩期间减少数据扩展的方法,其允许用于压缩在两个或多个编码方案之间交换的数据的编码方案。 具体地,提供了编码窗口,其允许分析编码窗口内的数据的压缩电位。 然后分析编码窗口内的数据以确定数据的压缩潜力。 如果数据的压缩电势超过第一预定值,则用于压缩编码窗口内的数据的编码方案从一个编码方案交换到另一编码方案。 优选地,第一预定值是可编程的,并且与编码方案之间来回切换所需的位成本相关。 两个优选的编码方案是ALDC Lempel-Ziv 1编码和其中原始数据未经编码的传递编码方案。