| 摘要 |
PURPOSE:To code into binary number automatically and stably, characters, graphs and objects in light and shade images regardless of size by compensating inappropriate threshold values sought in low contrast part areas in backgrounds with the threshold and weight values obtained. CONSTITUTION:The address controller 103 shall provide the threshold value/ weight value deciding part 104 with address for reading image patterns of designated area parts from the frame memory 102. The deciding part 104 shall assign in sequence area part numbers to the address controller 103 and obtain threshold and weight values for each area part which is given the interpolating processor 105. The processor 105 shall compensate the threshold value based on the threshold and weight values obtained from the weight deciding section 104 and furnishes same to the interpolating processor 106. Processor 106 shall interpolate the threshold value for each area part compensated by the processor 105 and obtain the threshold value for the entire image pattern, which is output to the frame memory 107. The comparator 108 depending on the size comparison of the picture element level corresponding to memory 102, 107, binarizes the picture element patterns and outputs to the frame memory 107 to attain automatic and stable binary coding.
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