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    • 58. 发明授权
    • Image signal processer reproducing halftone images in a recording system
printed thickened or thinned dots
    • 图像信号处理器在记录系统中再现半色调图像,印刷加厚或变薄的点
    • US5287419A
    • 1994-02-15
    • US017579
    • 1993-02-04
    • Shinichi SatoKazuto Kobayashi
    • Shinichi SatoKazuto Kobayashi
    • H04N1/405G06K9/38
    • H04N1/4052
    • An error distribution type image signal processor has a preprocessing unit consisting of a spatial filter for preprocessing input image signals of pixels, a recording dot correction factor setter for setting a correction factor based on a difference between an actual dot size and a theoretical dot size, an output image memory for storing output image signals obtained by binarizing the input image signals preprocessed, an error data corrector for correcting error data defined as a difference between the input image signals preprocessed and the output image signals binarized according to the correction factor and the output image signals binarized, an error data memory for storing corrected error data output from the error data corrector, and an error filter for weighting the corrected error data of pixels adjoining a pixel of interest and adding the corrected error data to an input image signal of the pixel of interest. Therefore, the error data are precisely corrected, and a halftone image with a smooth gradation is reproduced in a wide tonal range.
    • 误差分布型图像信号处理器具有由用于预处理像素的输入图像信号的空间滤波器构成的预处理单元,用于基于实际点尺寸和理论点尺寸之间的差设定校正因子的记录点校正系数设定器, 输出图像存储器,用于存储通过对预处理的输入图像信号进行二值化而获得的输出图像信号;误差数据校正器,用于校正被定义为预处理的输入图像信号与根据校正因子二值化的输出图像信号之间的差的误差数据, 二值化的图像信号,用于存储从误差数据校正器输出的校正后的误差数据的误差数据存储器,以及用于对与校正后的像素相邻的像素的校正误差数据进行加权的误差滤波器,并将校正后的误差数据与 感兴趣的像素 因此,误差数据被精确地校正,并且在宽音调范围内再现具有平滑灰度的半色调图像。