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    • 3. 发明授权
    • Apparatus and method for adjusting contrast of R,G,B signals
    • 用于调整R,G,B信号对比度的装置和方法
    • US5712659A
    • 1998-01-27
    • US383009
    • 1995-02-03
    • Toshiya Adachi
    • Toshiya Adachi
    • H04N5/202H04N9/69
    • H04N9/69
    • The video signal data of one of the three primary color signals having the maximum level is adjusted with regard to the amplitude level and the DC level thereof in accordance with a predetermined control data. A difference between the adjusted video signal data and a predetermined threshold level is calculated, and the control data is corrected by ones complement of the differential data. The video signal data of the three primary color signals are adjusted respectively, with regard to the amplitude level and DC level thereof in accordance with the corrected control data. In other words, merely with respect to the digital video signal data with the maximum level, the control and brightness controls are conducted. Then, a difference between the resultant video signal data and a predetermined threshold level is obtained for adjusting the respective contrast levels of the three primary color signals by using ones complement of the obtained differential data.
    • 根据预定的控制数据,调整具有最大电平的三个原色信号中的一个的视频信号相对于幅度电平和其直流电平。 计算调整后的视频信号数据与预定阈值电平之间的差异,并通过差分数据的补码校正控制数据。 根据校正的控制数据,分别调整三原色信号的视频信号的幅度电平和DC电平。 换句话说,仅仅对于具有最大电平的数字视频信号数据,进行控制和亮度控制。 然后,通过使用所获得的差分数据的一个补码,获得所得到的视频信号数据和预定阈值电平之间的差,以调整三个原色信号的各个对比度电平。