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    • 4. 发明授权
    • Serial digital video processing with concurrent adjustment in RGB and
luminance/color difference
    • 串行数字视频处理,并行调整RGB和亮度/色差
    • US5737032A
    • 1998-04-07
    • US523269
    • 1995-09-05
    • Robert E. StenzelDonald E. Groff
    • Robert E. StenzelDonald E. Groff
    • H04N9/67H04N9/68H04N9/64
    • H04N9/68H04N9/67
    • A digital converter controllably modifies input video data representing pixel luminance and color information, in two color space formats. Two color space converters are coupled in cascade. Serial video data is converted to parallel and demultiplexed. A first color space converter converts 4:2:2 sampled YCbCr luminance and color difference input data to RGB red/green/blue format. A second color space converter changes the data back to YCbCr before remultiplexing at the output. Under operator control from front panel inputs, a controller varies the conversion coefficients at the input-side color space converter, including by trigonometric functions applied to the coefficients to provide controllable hue phase shifting, modifies the transfer function in RGB color space by adjusting data in the lookup tables, and applies maximum/minimum clipping levels. Interpolation doubles the sample rate of CbCr color difference data at the input for co-siting each Y sample with a CbCr color difference for processing samples at 4:4:4. Two's complement computations, including for luminance Y, employ the full dynamic quantization range of the color space converters. An auxiliary color space converter operates on divided coefficients for detecting overflow. A bypass delay route is provided for non-video data, and error detection and handling signals are passed through as well as compared and generated for the changed data.
    • 数字转换器以两种颜色空间格式可控地修改表示像素亮度和颜色信息的输入视频数据。 两个色空间转换器级联耦合。 串行视频数据被转换为并行和解复用。 第一色彩空间转换器将4:2:2采样的YCbCr亮度和色差输入数据转换为RGB红/绿/蓝格式。 第二个颜色空间转换器将数据重新转换为YCbCr,然后再次复用输出。 在来自前面板输入的操作员控制下,控制器改变输入侧色彩空间转换器处的转换系数,包括通过应用于系数的三角函数来提供可控的色调相移,通过调整RGB颜色空间中的数据来修改RGB色彩空间中的传递函数 查找表,并应用最大/最小限幅级别。 插值使输入端的CbCr色差数据的采样率加倍,每个Y样本与CbCr色差共同处理4:4:4处理样本。 包括亮度Y在内的二进制补码计算采用色彩空间转换器的全动态量化范围。 辅助色彩空间转换器用于检测溢出的分割系数。 为非视频数据提供了旁路延迟路由,并通过了错误检测和处理信号,并对变化的数据进行了比较和生成。