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    • 13. 发明授权
    • Image processing method and apparatus with storing and selecting of dot
patterns
    • 具有存储和选择点图案的图像处理方法和装置
    • US5638188A
    • 1997-06-10
    • US276807
    • 1994-07-18
    • Takahiro MoroKatsumi MasakiTakafumi SawakiAtsushi Ushiroda
    • Takahiro MoroKatsumi MasakiTakafumi SawakiAtsushi Ushiroda
    • H04N1/46G06T5/00H04N1/405H04N1/52G06K9/00
    • H04N1/4051
    • An image processing apparatus of a digital copying apparatus, digital facsimile, printer, or the like comprises an input unit to input multi-level data, an arithmetic operation circuit for adding error data to the input multi-level data and calculating error correction data, a selector to select a predetermined dot pattern on the basis of the error correction data, an error calculation circuit to calculate a difference between a representative value for each dot pattern and the error correction data; and a storing circuit for storing the difference as error data into a memory. The selector comprises a level classification threshold value storage memory in which threshold values to classify the error correction data into levels have been stored, and a data level determination circuit for classifying the error correction data into levels on the basis of the value of the error correction data and the value stored in the level classification threshold value storage memory.
    • 数字复印装置,数字传真机,打印机等的图像处理装置包括:输入单元,输入多级数据;算术运算电路,用于将误差数据与输入的多级数据相加,并计算误差校正数据; 基于纠错数据选择预定点阵图形的选择器,计算每个点阵图形的代表值与纠错数据之差的误差计算电路; 以及存储电路,用于将差值作为误差数据存储到存储器中。 选择器包括:电平分类阈值存储存储器,其中将纠错数据分类为电平的阈值已被存储;以及数据电平确定电路,用于根据纠错值将误差校正数据分类为电平 数据和存储在级别分类阈值存储存储器中的值。