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US6069609A Image processor using both dither and error diffusion to produce halftone images with less flicker and patterns 失效
图像处理器使用抖动和误差扩散来产生具有较少闪烁和图案的半色调图像

Image processor using both dither and error diffusion to produce halftone images with less flicker and patterns
摘要：
An image processing device has an error distribution unit, and a multiplier. The error distribution unit carries out an error distribution operation to artificially increase the number of shades to be displayed on a display. The multiplier multiplies an input signal by a multiplication coefficient, so that the input signal is separated into display data and error data along a bit boundary and the error distribution operation is carried out on the input signal. Further, a semiconductor integrated circuit has a dither pattern generator, an adder, and an error distribution unit. The dither pattern generator stores a plurality of dither patterns in advance and receives an input image signal, the adder receives the input image signal and a pattern signal from the dither pattern generator, and the error distribution unit carries out an error distribution operation on the output of the adder. Therefore, the image processing device can realize a smooth display characteristic for the entire range of input shades.
摘要（中）：

图像处理装置具有误差分配单元和乘法器。 错误分配单元执行错误分布操作以人为地增加要在显示器上显示的色调数量。 乘法器将输入信号乘以乘法系数，使得输入信号沿着位边界分离成显示数据和误差数据，并且对输入信号执行误差分布操作。 此外，半导体集成电路具有抖动图案发生器，加法器和误差分配单元。 抖动图案生成器预先存储多个抖动图案并接收输入图像信号，加法器从抖动图案生成器接收输入图像信号和图案信号，并且误差分布单元对输出进行误差分布操作 的加法器。 因此，图像处理装置可以实现整个输入色调范围的平滑显示特性。

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