Resettable clamp-sample-and-hold signal processing circuit for imaging
sensors
    2.
    发明授权
    Resettable clamp-sample-and-hold signal processing circuit for imaging sensors 失效
    用于成像传感器的可复位钳位采样和保持信号处理电路

    公开(公告)号:US5349380A

    公开(公告)日:1994-09-20

    申请号:US776735

    申请日:1991-10-15

    申请人: John T. Stein

    发明人: John T. Stein

    IPC分类号: H04N5/357 H04N5/378 H04N3/14

    CPC分类号: H04N5/357

    摘要: A resettable clamp-sample-and-hold (RC-S/H) circuit includes a preamplifier 12 which buffers and scales a video imaging signal for an RC filter 17. Charge accumulated on the capacitor 16 of the RC filter 17 from previously recovered pixel voltage levels may be removed through a reset switch 18. The scaled video imaging signal may then propagate through a filter buffer 20, a clamp buffer 26 and a sample/hold buffer without the adverse effect of sequential pixel crosstalk.

    摘要翻译: 可复位钳位采样保持(RC-S / H)电路包括前置放大器12,其对RC滤波器17的视频成像信号进行缓冲和缩放。累积在RC滤波器17的电容器16上的电荷从先前恢复的像素 可以通过复位开关18去除电压电平。缩放的视频成像信号然后可以传播通过滤波器缓冲器20,钳位缓冲器26和采样/保持缓冲器,而不会产生顺序像素串扰的不利影响。

    Apparatus and method for minimizing velocity-mismatch MTF degradation in
TDI systems
    4.
    发明授权
    Apparatus and method for minimizing velocity-mismatch MTF degradation in TDI systems 失效
    用于最小化TDI系统中速度失配MTF降级的装置和方法

    公开(公告)号:US5453781A

    公开(公告)日:1995-09-26

    申请号:US110148

    申请日:1993-08-20

    申请人: John T. Stein

    发明人: John T. Stein

    摘要: Disclosed are methods and apparatus that minimize the degradation of the Modulation Transfer Function (MTF) which results from a mismatch between the velocity of an optical image (V.sub.TDI) and that of a corresponding charge image (V.sub.OPTICAL) formed in a TDI radiation detector array (14). In accordance with one aspect of this invention, there is developed a figure-of-merit (FOM) that is indicative of a match between the velocities of the optical image and the charge image. The velocity match metric is developed directly from recovered video information, and serves as an input to a closed-loop controller (22, 24, 26, 23, 26') which "servos" the velocity of the charge image in order to maximize the velocity match metric. In that the error signal is indicative of the true optical image velocity, MTF degradation due to velocity mismatch is minimized without requiring apriori knowledge of image velocity.

    摘要翻译: 公开了使由光学图像的速度(VTDI)与在TDI辐射探测器阵列中形成的对应的电荷图像(VOPTICAL)的失配导致的调制传递函数(MTF)的劣化最小化的方法和装置( 14)。 根据本发明的一个方面,开发了一个表示光学图像和电荷图像的速度之间匹配的品质因数(FOM)。 速度匹配度量是从恢复的视频信息直接发展的,并且作为一个输入到闭环控制器(22,24,26,23,26'),该控制器“伺服”电荷图像的速度,以便最大化 速度匹配度量。 因为误差信号表示真实的光学图像速度,所以由于速度失配导致的MTF退化被最小化,而不需要对图像速度的先验知识。