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    • 4. 发明申请
    • One-step black level calibration for image sensors
    • 图像传感器的一步黑色电平校准
    • US20090109305A1
    • 2009-04-30
    • US11981005
    • 2007-10-31
    • Tiejun DaiXiaodong LuoXiangchen Xu
    • Tiejun DaiXiaodong LuoXiangchen Xu
    • H04N9/64H04N9/04G03F3/08H04N5/00H04N5/335H04N3/14H04N9/083H04N5/16
    • H04N5/361
    • Embodiments of a process comprising receiving a plurality of offset analog signals, each corresponding to one of a plurality of black pixels in a pixel array; obtaining a corresponding digital value for each offset analog signal; computing an average of the digital values; and computing a black-level offset that, if applied to the digital values, would make the average of the digital values equal to a target value. Also disclosed are embodiments of an apparatus comprising an analog-to-digital converter coupled to an analog channel to receive offset analog black pixel signals from the analog channel and to obtain a corresponding digital value for each offset analog signal; circuitry and logic coupled to the analog-to-digital converter to average the digital values corresponding to the black pixels and compute a black-level offset that, if applied to the digital values of the black pixels, would make the average of the digital values of the black pixels equal to a target value.
    • 一种处理的实施例包括接收多个偏移模拟信号,每个偏移模拟信号对应于像素阵列中的多个黑色像素中的一个; 获得每个偏移模拟信号的相应数字值; 计算数字值的平均值; 并且计算黑电平偏移,如果应用于数字值,则将使数字值的平均值等于目标值。 还公开了一种装置的实施例,其包括耦合到模拟通道的模数转换器以从模拟通道接收偏移模拟黑色像素信号并获得每个偏移模拟信号的相应数字值; 电路和逻辑耦合到模数转换器以平均对应于黑色像素的数字值,并计算黑电平偏移,如果应用于黑色像素的数字值,则将使数字值的平均值 的黑色像素等于目标值。