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    • 35. 发明授权
    • Apparatus for enhancing contours of television signal
    • 用于增强电视信号轮廓的装置
    • US4823190A
    • 1989-04-18
    • US32226
    • 1987-03-31
    • Kazumi Yamamoto
    • Kazumi Yamamoto
    • H04N5/208H04N5/14
    • H04N5/142
    • An apparatus for effecting contour enhancement in a non-linear manner, in accordance with the amplitude of a contour signal, includes an upper limiter for clipping a portion of the contour signal exceeding an upper level and a lower limiter for clipping a portion of the contour signal below a lower level. The gain of the contour signal for a brightness signal having a large level difference is decreased relative to the gain of the contour enhancement signal for a brightness signal having a small level difference, and thus glare and cross-color noise can be reduced materially, while the contour for a brightness signal having a small level difference can be enhanced sufficiently.
    • 根据轮廓信号的振幅以非线性方式实现轮廓增强的装置包括用于限制超过上限的轮廓信号的一部分的上限制器和用于限制轮廓的一部分的下限位器 信号低于较低水平。 具有大电平差的亮度信号的轮廓信号的增益相对于具有小电平差的亮度信号的轮廓增强信号的增益而减小,因此可以实质地减少眩光和交叉色噪声,同时 可以充分地增强具有小水平差的亮度信号的轮廓。