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    • 2. 发明授权
    • Image reader
    • 图像阅读器
    • US5191445A
    • 1993-03-02
    • US563923
    • 1990-08-07
    • Hiromitsu KurokawaTadayoshi MiyoshiTakashi KuriyamaIchiro Shishido
    • Hiromitsu KurokawaTadayoshi MiyoshiTakashi KuriyamaIchiro Shishido
    • H04N1/401H04N5/335H04N5/361H04N5/365H04N5/372H04N5/378
    • H04N1/401
    • There is provided an improved image reader. In the image reader, light from an object is converted into an analog signal by a photoelectric converter. The signal is quantized by an A/D converter on the basis of top and bottom reference voltages to produce a digital picture signal. A digital picture signal corresponding to a dark current flowing to the photoelectric converter is stored in a memory as a dark current data. Also a digital picture signal corresponding to the optical strength of predetermined level is stored in another memory as a white level data. Then, the top and bottom reference voltages are produced which correspond to the top and bottom quantization-threshold values on the basis of the dark current and white level data, respectively. The top and bottom reference voltages are then respectively applied to the A/D converter to produce the digital picture signal without signal distortion.
    • 提供了一个改进的图像阅读器。 在图像读取器中,来自物体的光由光电转换器转换为模拟信号。 信号由A / D转换器基于顶部和底部参考电压量化,以产生数字图像信号。 对应于流向光电转换器的暗电流的数字图像信号作为暗电流数据存储在存储器中。 此外,与预定水平的光强度相对应的数字图像信号也作为白电平数据存储在另一存储器中。 然后,分别基于暗电流和白电平数据产生对应于顶部和底部量化阈值的顶部和底部参考电压。 然后将顶部和底部参考电压分别施加到A / D转换器以产生没有信号失真的数字图像信号。
    • 4. 发明授权
    • Color television signal generating apparatus
    • 彩色电视信号发生装置
    • US4277800A
    • 1981-07-07
    • US129337
    • 1980-03-11
    • Shintaro NakagakiItsuo TakanashiKoichiro MotoyamaTadayoshi MiyoshiSumio YokokawaKenichi Miyazaki
    • Shintaro NakagakiItsuo TakanashiKoichiro MotoyamaTadayoshi MiyoshiSumio YokokawaKenichi Miyazaki
    • H04N9/04H04N9/07H04N9/083
    • H04N9/07H04N9/083
    • A color television signal generating apparatus comprises a color-resolving striped filter, in a camera tube, for separating the output signal of the camera tube into required signals. The output of the camera tube is a superimposed signal comprising a direct wave signal containing signals of the three primary colors of said addition mixture color, and a high-band signal component comprising a group of modulated color signals resulting from an amplitude modulation of a carrier wave by the signals of two primary colors other than the primary color of the light transmitted through said first filter stripe, said carrier wave having a frequency equal to a space frequency determined by the number of said groups of filter stripes, and said carrier wave also having frequency components which are higher harmonics of the frequency of said carrier wave. The color television signal generating apparatus further comprises a first separation circuit for separating and deriving, out of the output signal of the camera tube, a fundamental wave component signal in which the carrier wave having the frequency equal to the space frequency is amplitude modulated, a second separation circuit for separating and deriving, out of the output signal of the camera tube, a second harmonics wave component signal in which a carrier wave having a frequency twice the space frequency is amplitude modulated, a multiplication circuit for multiplying the output signals of the first and second separation circuits, and a circuit for separating and deriving signals of two primary colors other than the primary color transmitted through the first filter stripe, responsive to the output signals of the multiplication means and the first separation circuit.
    • 彩色电视信号发生装置包括在相机管中的分色条纹滤光器,用于将相机管的输出信号分离成所需信号。 相机管的输出是包括包含所述加法混合颜色的三原色的信号的直接波信号的叠加信号,以及包括由载波的幅度调制产生的一组调制的彩色信号的高频带信号分量 通过除了通过所述第一滤波器条纹的光的原色之外的两种原色的信号波,所述载波具有等于由所述滤波器条带组的数量确定的空间频率的频率,并且所述载波也 具有作为所述载波的频率的高次谐波的频率分量。 彩色电视信号发生装置还包括第一分离电路,用于分离和导出相机管的输出信号,其中具有等于空间频率的频率的载波被幅度调制的基波分量信号,a 第二分离电路,用于分离和导出相机管的输出信号中具有频率为空间频率的两倍的载波被调幅的二次谐波分量信号;乘法电路,用于将 第一分离电路和第二分离电路,以及用于分离和导出除了通过第一滤波器条带传输的原色之外的两种原色的信号的电路,其响应于乘法装置和第一分离电路的输出信号。
    • 5. 发明授权
    • Signal processing circuit for a color television camera
    • 彩色电视摄像机信号处理电路
    • US4272779A
    • 1981-06-09
    • US004721
    • 1979-01-19
    • Shintaro NakagakiItsuo TakanashiSumio YokokawaTadayoshi MiyoshiKoichiro MotoyamaKenichi Miyazaki
    • Shintaro NakagakiItsuo TakanashiSumio YokokawaTadayoshi MiyoshiKoichiro MotoyamaKenichi Miyazaki
    • H04N9/07H04N9/04
    • H04N9/07
    • A signal processing circuit for a color television camera has filters supplied with a multiplex input signal. The direct wave signal includes a plurality of amplitude-modulated color component signals obtained from a camera tube of a color television camera. The tube filters the high-frequency components of the input signal. Detection and processing circuits detect the output signal of the high-pass filter and produce signals having restored DC components. The circuit provides gamma correction, white clipping, linear clipping, blanking signal mixing, or like signal processing with respect to the produced signal. A low-pass filter passes the input signal from the camera tube and filters the direct wave signal of the input signal. A processing circuit processes the output signals of the low-pass filter, and a matrix circuit matrixes the output signals of the detection and processing circuits to obtain three primary color signals. A color encoder provides a composite color video signal from the three primary color signals produced by the matrix circuit.
    • 用于彩色电视摄像机的信号处理电路具有提供有复用输入信号的滤波器。 直接波信号包括从彩色电视摄像机的相机管获得的多个幅度调制色分量信号。 管过滤输入信号的高频分量。 检测和处理电路检测高通滤波器的输出信号并产生具有恢复的DC分量的信号。 该电路针对所产生的信号提供伽马校正,白削波,线性削波,消隐信号混合或类似的信号处理。 低通滤波器通过来自相机管的输入信号并对输入信号的直接波信号进行滤波。 处理电路处理低通滤波器的输出信号,并且矩阵电路对检测和处理电路的输出信号进行矩阵校准,以获得三原色信号。 彩色编码器提供由矩阵电路产生的三原色信号的复合彩色视频信号。