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    • 6. 发明授权
    • Analog-to-digital converter utilizing a random noise source
    • 使用随机噪声源的模数转换器
    • US4034367A
    • 1977-07-05
    • US551283
    • 1975-02-20
    • Takashi SugiyamaTakashi Tsuda
    • Takashi SugiyamaTakashi Tsuda
    • H03M1/00H03K13/02
    • H03M1/201
    • An analog-to-digital converter arranged to accept an analog input signal and to convert it into an output having digital form. The converter is characterized by a reference random noise source which generates random noise signals with uniform amplitude occurrence probability density in a given range, and by an amplitude comparator arranged to repeatedly compare the amplitude of the random noise signal with the amplitude of a signal varying with the analog signal to be converted. The amplitude comparator supplies output pulses in accordance with the comparisons, e.g., whenever the analog signal amplitude is greater than the random noise amplitude, and the number of pulses from the amplitude comparator in a measurement interval then digitally corresponds to the value of the analog signal and may be utilized, as in a display. Resolution of the converter is increased beyond the minimum amplitude increment of the random noise source signal in one embodiment by superposition on either the analog signal or the random noise signal of a triangular wave with an amplitude greater than the minimum amplitude increment of the random noise signal, and in another embodiment by superposition of a second random noise signal.
    • 一种模拟 - 数字转换器,被配置为接受模拟输入信号并将其转换成具有数字形式的输出。 转换器的特征在于参考随机噪声源,其产生在给定范围内具有均匀振幅发生概率密度的随机噪声信号,并且通过幅度比较器布置成重复地比较随机噪声信号的振幅与随 要转换的模拟信号。 幅度比较器根据比较提供输出脉冲,例如,每当模拟信号幅度大于随机噪声幅度时,并且在测量间隔中来自幅度比较器的脉冲数然后数字地对应于模拟信号的值 并且可以如在显示器中那样被利用。 在一个实施例中,转换器的分辨率增加到随机噪声源信号的最小幅度增量之外,通过叠加具有大于随机噪声信号的最小振幅增量的三角波的模拟信号或随机噪声信号 ,并且在另一个实施例中通过叠加第二随机噪声信号。
    • 8. 发明授权
    • Method and apparatus for imaging
    • 成像方法和装置
    • US08054351B2
    • 2011-11-08
    • US12714191
    • 2010-02-26
    • Takashi Tsuda
    • Takashi Tsuda
    • H04N5/217
    • H04N9/045
    • According to one embodiment, a shading correction circuit, which corrects for the influence of ambient light quantity shading, for input image light from three CCD sensors of R, G and B, based on a distance from the center of a screen. A shading correction circuit does not make correction for a maximum correction area which is out of a circle with a distance a from the central part of a screen, and corrects for the influence of ambient light quantity shading for a minimum correction area with a distance b from the central part of a screen, after calculating a square L2 of an address distance of each pixel of a correction object obtained by using a vertical distance and a horizontal distance from an address of the central part of a screen.
    • 根据一个实施例,一种阴影校正电路,其校正来自R,G和B的三个CCD传感器的输入图像光的环境光量阴影的影响,基于距离屏幕中心的距离。 阴影校正电路不对距离屏幕中心距离a的圆圈以外的最大校正区域进行校正,并且将距离b的最小校正区域的环境光量阴影的影响校正 在从屏幕的中心部分的地址利用垂直距离和水平距离计算校正对象的每个像素的地址距离的平方L2之后,从屏幕的中心部分。