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发明授权
US5809177A Hybrid error diffusion pattern shifting reduction using programmable threshold perturbation 失效
使用可编程阈值扰动的混合误差扩散模式移位减少

Hybrid error diffusion pattern shifting reduction using programmable threshold perturbation
摘要：
A process eliminates pattern shifting artifacts in a printed image rendered using a hybrid high addressable error diffusion process by perturbing a threshold/image signal value relationship when a multi-level grey level is binarized. The process utilizes a programmable multi-level grey signal modifying circuit for modifying the multi-level grey signal by a predetermined value according to its grey level. The modified multi-level grey signal is binarized to a binary pixel signal according to a relationship between the modified multi-level grey signal and a threshold value. The process further generates an error corresponding to the relationship and diffuses the error to neighboring pixels. The multi-level grey signal is modified with either random noise multiplied by a grey level dependent coefficient or by a predetermined value from a checkerboard or vertical line pattern. The value from the pattern is dependent upon the grey level and pixel location of the image data.
摘要（中）：

当多级灰度级被二值化时，处理消除了使用混合高可寻址误差扩散处理所形成的打印图像中的图案移位伪像，该方法通过扰乱阈值/图像信号值关系。 该过程利用可编程多级灰度信号修正电路，根据其灰度级将多级灰度信号修正预定值。 修改后的多级灰度信号根据修改的多级灰度信号与阈值之间的关系被二值化为二进制像素信号。 该过程进一步产生与该关系对应的错误，并将误差扩散到相邻像素。 多级灰度信号用随机噪声乘以灰度级依赖系数或来自棋盘或垂直线图案的预定值进行修改。 图案中的值取决于图像数据的灰度级和像素位置。

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