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    • 36. 发明授权
    • Digital signal video color compression method and apparatus
    • 数字信号视频彩色压缩方法及装置
    • US5424755A
    • 1995-06-13
    • US904097
    • 1992-06-25
    • Bruce D. LucasAlexander G. MacInnisPaul S. Yosim
    • Bruce D. LucasAlexander G. MacInnisPaul S. Yosim
    • G09G5/00G09G3/20G09G5/02H04N1/64G09G3/02
    • H04N1/648G09G5/02G09G3/2051
    • This invention provides a method of and apparatus for compressing digital video color signals derived from a natural image and generating display signals for a color image composed of pixels derived from the compressed signals in which digital color signals representative of color depth intensities of three colors for each pixel to be displayed, each color signal having at least four bits representing the color intensity of a corresponding color for a corresponding pixel and arranged from most to least significant bits, are received; a digital dither signal for each pixel to be displayed is generated; a selected number of the most significant bits of each received color signal are summed with the corresponding generated dither signal; a selected number of the least significant bits of the summed color and dither signals are discarded to compress the corresponding received color signal; the compressed color signals related to a common pixel are concatenated to generate a digital output signal having a predetermined bit length less than the summed bit lengths of the received digital color signals and representative of the depth intensities of three colors for the common pixel; and analog display driver signals representative of the color intensities of pixels to be displayed are generated by selecting from a color lookup table stored in a digital to analog converter analog signals corresponding to the stored output signals.
    • 本发明提供了一种用于压缩从自然图像导出的数字视频彩色信号的方法和装置,并且生成由压缩信号导出的像素组成的彩色图像的显示信号,其中代表每种颜色的三种颜色深度强度的数字彩色信号 要显示的像素,每个颜色信号具有至少四位表示相应像素的对应颜色的颜色强度并且从大多数到最低有效位排列; 生成要显示的每个像素的数字抖动信号; 每个接收到的颜色信号的选定数目的最高有效位与对应的产生的抖动信号相加; 相加颜色和抖动信号的选定数目的最低有效位被丢弃以压缩对应的接收颜色信号; 与公共像素相关联的压缩颜色信号被级联以产生具有小于接收的数字彩色信号的相加位长度的预定位长度并表示公共像素的三种颜色的深度强度的数字输出信号; 并且通过从存储在对应于所存储的输出信号的数模转换器模拟信号中的颜色查找表中选择表示要显示的像素的颜色强度的模拟显示驱动器信号。