公开(公告)号：US5673065A

公开(公告)日：1997-09-30

申请号：US581459

申请日：1995-12-29

申请人： William C. DeLeeuw

发明人： William C. DeLeeuw

IPC分类号： G09G3/20 ,  G09G5/02 ,  G09G5/06 ,  B09G5/04

CPC分类号： G09G5/02 ,  G09G5/06 ,  G09G3/2051

摘要： A color image signal is reduced and converted. Dithering the remainder is an embodiment. For example a pixel value is separated into its pixel components. Each component is further split into most-significant bit (MSB) and least-significant bit (LSB) parts. The MSBs from each component are combined to provide a color number. The color number is an index to a nearest-color map. Each entry in the nearest-color map is an index to a spectrum color palette having color entries. The spectrum color palette is an evenly divided spectrum of the colors displayable on an associated video display system. The particular color accessed in the color spectrum palette by the color palette is used for the pixel in the image being reduced and converted. In an embodiment, the LSBs of each color component are dithered. If the value of the LSBs of a color component are greater than a dither threshold value, a one is added to the MSBs of the color, prior to the MSB values being combined into the color number.

摘要翻译： 彩色图像信号被减少和转换。 抖动剩余部分是一个实施例。 例如像素值被分成其像素分量。 每个组件进一步分为最高有效位（MSB）和最低有效位（LSB）部分。 来自每个组件的MSB被组合以提供颜色编号。 颜色编号是最近色图的索引。 最近色图中的每个条目是具有颜色条目的光谱调色板的索引。 光谱调色板是可在相关视频显示系统上显示的颜色的均匀分布的光谱。 通过调色板在色谱调色板中访问的特定颜色被用于减少和转换图像中的像素。 在一个实施例中，每个颜色分量的LSB被抖动。 如果颜色分量的LSB的值大于抖动阈值，则在将MSB值组合成色数之前，将一个值添加到颜色的MSB。