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1.发明公开Circuit for automatically adjusting the digitisation threshold of a reading signal for a digital image scanning device 失效用于自动调整用于数字图像扫描装置的读取信号的数字化阈值的电路
公开(公告)号：EP0333313A3
公开(公告)日：1991-05-02
申请号：EP89301080.1
申请日：1989-02-03
IPC分类号： H04N1/40
CPC分类号： H04N1/403
摘要： The circuit defines the digitization threshold (V s ) in dependenced on the positive-peak and negative-peak signals previously received from the elements for scanning the pixels of the image, and in dependence on the analog signal (AS) of the pixel. The circuit comprises two detectors (21, 22) for respectively detecting a positive peak and a negative peak and which each have a short charge time constant and a long discharge time constant. A summing circuit (25) generates the threshold signal (V s ) as a linear combination of the signals (V max , V min ) of the detectors (21, 22), the analog signal (AS) of the pixel and a reference signal (V r ). Finally the threshold signal is compared (26) to the analog signal (AS) of the pixel to produce a binary reading signal.
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2.发明公开Circuit for automatically adjusting the digitisation threshold of a reading signal for a digital image scanning device 失效用于读出信号的数字化阈值的用于数字图像扫描仪的自动平衡电路布置。
公开(公告)号：EP0333313A2
公开(公告)日：1989-09-20
申请号：EP89301080.1
申请日：1989-02-03
IPC分类号： H04N1/40
CPC分类号： H04N1/403
摘要： The circuit defines the digitization threshold (V s ) in dependenced on the positive-peak and negative-peak signals previously received from the elements for scanning the pixels of the image, and in dependence on the analog signal (AS) of the pixel. The circuit comprises two detectors (21, 22) for respectively detecting a positive peak and a negative peak and which each have a short charge time constant and a long discharge time constant. A summing circuit (25) generates the threshold signal (V s ) as a linear combination of the signals (V max , V min ) of the detectors (21, 22), the analog signal (AS) of the pixel and a reference signal (V r ). Finally the threshold signal is compared (26) to the analog signal (AS) of the pixel to produce a binary reading signal.
摘要翻译： 该电路在定义上dependenced从元件先前接收到的用于扫描图像的像素的正峰值和负峰值信号数字化的阈值（VS），而在像素的模拟信号（AS）的依赖。 该电路用于分别检测正峰值和负峰值，并各自具有一个短的充电时间常数和放电时间长常数包括两个检测器（21，22）。 检测器的求和电路（25）基因率阈值信号（Vs）作为信号的线性组合（最大值，最小值）（21，22），所述模拟信号的像素的（AS）和参考信号（VR） ， 最后，阈值信号进行比较（26）以产生二进制读出信号的像素的模拟信号（AS）。
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