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    • 2. 发明授权
    • Processing of gray scale image pels to facilitate data compression
    • 处理灰度图像像素以方便数据压缩
    • US4599656A
    • 1986-07-08
    • US581768
    • 1984-02-21
    • Joan M. Bellinghausen
    • Joan M. Bellinghausen
    • H04N7/14G06T3/40G06T9/00H04N1/403H04N1/409H04N1/41H04N1/40H04N1/419
    • H04N1/409G06T3/403H04N1/403
    • A process is described for identifying those pels in a gray scale image which are candidates for vertical filtering before the image is thresholded to binary or black/white pel values. The vertical neighbor pels of a pel below a run end point are examined to determine whether their gray scale values fall within the same range. If they do, the horizontal neighbors of the current pel are examined to see whether their gray scale values fall in different ranges. If they do, the pel is vertically filtered by adjusting its gray scale value as a function of the differences between its value and the values of its vertical neighbors. Because only selected pels are vertically filtered, the process can be carried out with a general purpose microprocessor rather than a special purpose parallel processor.
    • 描述了用于识别在图像被阈值化为二进制或黑/白像素值之前的用于垂直滤波的候选的灰度图像中的那些像素的处理。 检查运行终点以下的像素的垂直相邻像素,以确定它们的灰度值是否落在相同的范围内。 如果这样做,则检查当前像素的水平相邻值以查看它们的灰度值是否落在不同的范围内。 如果它们这样做,则通过调整其灰度值作为其值与其垂直相邻值之间的差异的函数来垂直滤波像素。 因为只有选择的像素被垂直滤波,所以可以用通用微处理器而不是专用并行处理器进行处理。