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1. 发明授权

US06307647B1 Digital halftoning with error diffusion 失效
标题翻译：数字半色调与误差扩散
公开(公告)号：US06307647B1
公开(公告)日：2001-10-23
申请号：US08435592
申请日：1995-05-05
申请人： Allan Chiwan Cheung , Scott Michael Heydinger , Shaun Timothy Love
发明人： Allan Chiwan Cheung , Scott Michael Heydinger , Shaun Timothy Love
IPC分类号： H04N140
CPC分类号： H04N1/4052
摘要： An error diffusion halftoning technique calculates only two error terms with one being divisible by two and the other being divisible by four. This is accomplished through using a modified Floyd and Steinberg type filter preferably having weights of 8-0-4-4 expressed in clockwise sequence from the origin. The direction of scanning is preferably reversed each scan line.
摘要翻译：错误扩散半色调技术仅计算两个误差项，一个可被二除，另一个可除以四。这通过使用优选具有从原点顺时针顺序表示的重量为8-0-4-4的改进的Floyd和Steinberg型过滤器来实现。扫描方向最好是每条扫描线都相反。

2. 发明授权

US5973803A Combined color halftoning 失效
公开(公告)号：US5973803A
公开(公告)日：1999-10-26
申请号：US932516
申请日：1997-09-18
申请人： Allan Chiwan Cheung , Scott Michael Heydinger
发明人： Allan Chiwan Cheung , Scott Michael Heydinger
IPC分类号： G03G15/01 , G06K9/00 , G06T5/00 , G06T11/00 , H04N1/46 , H04N1/52 , H04N1/60
CPC分类号： H04N1/52
摘要： Halftoning algorithms such as error diffusion, blue noise mask, and void and cluster mask are known to produce visually pleasing, random, homogeneously distributed patterns of dots on output devices such as color displays or printers, for example. These algorithms are extended to take advantage of the mechanisms of each that cause a homogeneous distribution of dots of one colorant to produce a substantially homogeneous distribution of dots when using multiple colorants. The number of dots of each colorant are combined to form an output dot level number of dots that is caused to be substantially homogeneously distributed.

3. 发明授权

US06363172B1 Combined color halftoning 有权
标题翻译：组合色调
公开(公告)号：US06363172B1
公开(公告)日：2002-03-26
申请号：US09301499
申请日：1999-04-28
申请人： Allan Chiwan Cheung , Scott Michael Heydinger
发明人： Allan Chiwan Cheung , Scott Michael Heydinger
IPC分类号： H04N146
CPC分类号： H04N1/52
摘要： Halftoning algorithms such as error diffusion, blue noise mask, and void and cluster mask are known to produce visually pleasing, random, homogeneously distributed patterns of dots on output devices such as color displays or printers, for example. These algorithms are extended to take advantage of the mechanisms of each that cause a homogeneous distribution of dots of one colorant to produce a substantially homogeneous distribution of dots when using multiple colorants. The number of dots of each colorant are combined to form an output dot level number of dots that is caused to be substantially homogeneously distributed.
摘要翻译：已知半色调算法，例如误差扩散，蓝色噪声掩模，以及空白和簇掩模，例如在诸如彩色显示器或打印机的输出设备上产生视觉上令人满意的随机均匀分布的点图案。这些算法被扩展以利用每个引导均匀分布的一种着色剂的机制，以在使用多个着色剂时产生基本均匀的点分布。将各着色剂的点数合并形成基本上均匀分布的点的输出点数。

4. 发明授权

US5930010A Method and apparatus for color halftoning using different halftoning techniques for halftoning different dot planes 失效
标题翻译：使用不同的半色调技术对不同点平面进行半色调的颜色半色调的方法和装置
公开(公告)号：US5930010A
公开(公告)日：1999-07-27
申请号：US594981
申请日：1996-01-31
申请人： Allan Chiwan Cheung , Scott Michael Heydinger , Steven Frank Weed
发明人： Allan Chiwan Cheung , Scott Michael Heydinger , Steven Frank Weed
IPC分类号： H04N1/405 , H04N1/52 , H04N1/46
CPC分类号： H04N1/405 , H04N1/52
摘要： Digital halftoning is used to reduce the number of pixel levels used to represent a multiple dot plane image to a smaller number of pixel levels for display on an output device such as an ink-jet printer. Two algorithms commonly used to halftone the dots of a given dot plane are error diffusion and ordered dither. Error diffusion produces patterns of dots that are pleasing to the human visual system but is computationally complex. Ordered dither operates quickly but produces patterns of dots that are visually objectionable. A method is taught in the present invention that employs error diffusion to halftone dot planes that contain relatively dark dots that are visually apparent, and employs ordered dither to halftone dot planes that contain relatively light dots that are not noticeable. The resulting output is pleasing to the human visual system and computed quickly.
摘要翻译：数字半色调用于将用于表示多点平面图像的像素级数减少到更少数量的像素级，以便在诸如喷墨打印机的输出设备上显示。通常用于对给定点平面的点进行半色调的两种算法是误差扩散和有序抖动。错误扩散产生对人类视觉系统令人满意的点，但是计算复杂的点的图案。有序的抖动操作迅速，但产生视觉上令人反感的点阵图案。在本发明中教导了一种在视觉上包含相对较暗的点的半色调点平面上使用误差扩散的方法，并且使用具有不明显的相对较浅点的半色调点平面的有序抖动。产生的结果令人满意的人类视觉系统并迅速计算。

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