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    • 2. 发明授权
    • Solid state television camera with iris control
    • 具有虹膜控制的固态电视摄像机
    • US4516172A
    • 1985-05-07
    • US405571
    • 1982-08-05
    • Katsuro MiyataTakashi AsaidaFumio Nagumo
    • Katsuro MiyataTakashi AsaidaFumio Nagumo
    • H04N5/238H04N5/335H04N5/359H04N5/3725H04N5/378H04N5/16
    • H04N5/238
    • A solid state television camera having a solid state image sensing device, such as CCD image sensing device and an iris for controlling the amount of light from an image irradiated on the image sensing device. The iris is controlled by the peak level of a smear signal of a horizontal scanning line during a vertical blanking interval so that the smear signal contained in a video signal from the image sensing device is reduced. Further, the iris can be controlled by the average level of the smear signal instead of the average level of the video signal of one field as the smear signal has the whole information of the image of one field, that causes the construction of detecting circuit to be very simple and the fidelity of the iris control to be high.
    • 具有固态摄像装置的固态电视摄像机,例如CCD摄像装置和用于控制从图像摄影装置上照射的图像的光量的光圈。 在垂直消隐间隔期间,虹膜由水平扫描线的拖尾信号的峰值电平控制,使得包含在来自图像感测装置的视频信号中的拖影信号减小。 此外,由于拖尾信号具有一个场的图像的整个信息,所以可以通过拖尾信号的平均电平而不是一个场的视频信号的平均电平来控制光圈,这导致检测电路的构造 非常简单,虹膜控制的保真度很高。