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    • 1. 发明授权
    • Distributed PWM halftoning unit and printer
    • 分布式PWM半色调单元和打印机
    • US06191868B1
    • 2001-02-20
    • US09146348
    • 1998-09-03
    • Takeshi ShibuyaTadashi OkadaMasayuki KandaEiji YoshinoAtsushi OnoseTatsuki InuzukaToshiaki Nakamura
    • Takeshi ShibuyaTadashi OkadaMasayuki KandaEiji YoshinoAtsushi OnoseTatsuki InuzukaToshiaki Nakamura
    • H04N152
    • H04N1/4058
    • In a halftoning unit of a laser printer and the like, a high speed, high density and high gradations halftoning is realized by multi-value implementation by clustered dot concentrated dither halftoning (known as a sub-matrix method) and PWM distributing gradation among the plurality of halftone dots with a small memory and circuit. For this purpose, the value of the difference between an input gradation value ni and a threshold value nc, &Dgr;n=ni−nc, is shortened within a range of 0 to &Dgr;h and the lower s bit of &Dgr;h is removed by a round-down or round-up process. Meanwhile, a threshold array is generated from an extended threshold pattern obtained by combining threshold patterns of 2s whose threshold interval is &Dgr;h, i.e. &Dgr;Ah×K, &Dgr;h×K+1, . . . , &Dgr;×K+2(s−1). Thereby, a halftone dot dither process in which the PWM gradation increases distributively among the 2s dots may be realized with a small scale memory and circuit.
    • 在激光打印机等的半色调单元中,通过集群点集中抖动半色调(称为子矩阵法)的多值实现和PWM分配灰度等级来实现高速,高密度和高等级的半色调 多个具有小存储器和电路的半色调点。 为此,输入灰度值ni和阈值nc之间的差值DELTAn = ni-nc在0到DELTAh的范围内缩短,并且通过向下舍入来去除DELTAh的较低s位 或综合处理。 同时,通过组合其阈值间隔为DELTAh的2s的阈值模式(即DELTAAhxK,DELTAhxK + 1)获得的扩展阈值模式来生成阈值阵列。 。 。 ,DELTAxK + 2(s-1)。 由此,可以利用小尺度的存储器和电路来实现其中PWM等级在2s点之间分布增加的半色调点抖动处理。