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    • 5. 发明授权
    • Data compression processing method and apparatus
    • 数据压缩处理方法及装置
    • US06674912B2
    • 2004-01-06
    • US09740996
    • 2000-12-21
    • Isao IgarashiTsuyahiko ShimadaYoshiharu Shimada
    • Isao IgarashiTsuyahiko ShimadaYoshiharu Shimada
    • G06K936
    • G06T9/005H04N1/4175
    • The present invention provides a high speed MMR compression processing method by reducing the number of times of repeating a process of finding the positions of changing pixels a1, a2, b1, and b2. According to this method, first, a bit string corresponding to pixel data is obtained from an image. Then, data are sequentially fetched from the bit string byte by byte. Subsequently, a search is made of a table that describes the number of consecutive bits that are arranged to the right of and have the same color as each of bits of each byte of all bit patterns represented by bits included in the fetched 1 byte. Then, the number of consecutive bits, which are arranged to the right of and have the same color as each of bits of each of the fetched bytes, is detected according to the bit patterns represented by bits of the fetched byte. Subsequently, a pixel placed at the position corresponding to the number obtained by adding 1 to the detected number of consecutive bits is determined as a color changing pixel. Then, the position of each changing pixel in each of the sequentially fetched bytes is obtained. Subsequently, the image data is coded according to the position of each of the changing pixels.
    • 本发明通过减少重复找到改变像素a1,a2,b1和b2的位置的处理的次数来提供高速MMR压缩处理方法。 根据该方法,首先,从图像获得与像素数据对应的位串。 然后,逐位逐位地从数据位取出数据。 随后,搜索描述布置在所取出的1字节中包括的比特所表示的所有比特模式的每个字节的每一位的右侧并且具有相同颜色的连续比特的数目的表格。 然后,根据取出的字节的位表示的位模式来检测排列在每个取出字节的位的右侧并具有与每个位的颜色相同的连续位的数量。 随后,将位于与通过将1相加而获得的数字相对应的位置处的像素确定为检测到的连续位数,作为变色像素。 然后,获得每个顺序读取的字节中的每个改变像素的位置。 随后,根据每个变化像素的位置对图像数据进行编码。