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    • 4. 发明授权
    • Text image data compression system
    • 文本图像数据压缩系统
    • US5056154A
    • 1991-10-08
    • US431828
    • 1989-11-06
    • Tomoko AonoHiroyuki KatataYoji Noguchi
    • Tomoko AonoHiroyuki KatataYoji Noguchi
    • G06T9/00
    • G06T9/005
    • A text image data compression system for compressing image data having pixels each being expressed by N bit data which varies from a maximum value to a minimum value, includes a circuit for replacing the maximum value N bit data with a first symbol "3" followed by N-1 bit common data "*" and the minimum value N bit data with a second symbol "2" followed by N-1 bit common data "*". Also provided is a circuit for making a symbol alignment such that the most significant symbols are collected and are aligned from the first row to the bottom row, the second significant symbols are collected and are aligned from the first row to the bottom row, kth significant symbols are collected and are aligned from the first row to the bottom row, in which k is between three and N-1, and the least significant symbols are collected and are aligned from the first row to the bottom row, and that all of said common symbols "*" are removed; and a circuit for detecting run lengths in the symbol alignment to produce run lengths of four different symbols "3", "2", "1" and "0".
    • 用于压缩具有由从最大值到最小值变化的N位数据表示的像素的图像数据的文本图像数据压缩系统包括用第一符号“3”代替最大值N位数据的电路, N-1位公共数据“*”和具有第二符号“2”的最小值N位数据,随后是N-1位公共数据“*”。 还提供了用于进行符号对准的电路,使得最重要的符号被收集并且从第一行到底行对准,第二有效符号被收集并且从第一行到底行对齐,第k个有效位 符号被收集并且从第一行到底行对齐,其中k在三和N-1之间,并且最不重要的符号被收集并且从第一行到底行对齐,并且所有所述 共同符号“*”被删除; 以及用于检测符号对准中的行程长度以产生四个不同符号“3”,“2”,“1”和“0”的行程长度的电路。