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Digital-apparatus-for-contour-enhancement-of-video-signal

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Digital apparatus for contour enhancement of video signal

Details

Inventors: Tanji, Ichiro; Kihara, Taku;
Assignee: Sony Corporation (Tokyo, JP)
Primary Examiner: Hsia; Sherrie
Assistant Examiner:
Attorney, Agent or Firm: Frommer Lawrence & Haug LLP, Frommer; William S.

Digital processing apparatus for correcting an image enhancement signal having a shape includes a peak detector for detecting and holding peak levels of the image enhancement signal and an adjustment circuit, responsive to the peak levels, for correcting the image enhancement signal to reduce its peak levels while substantially maintaining its shape and to limit the signal levels of the image enhancement signal to a range of levels substantially between a first predetermined peak limit and a second predetermined peak limit.

DETAILED DESCRIPTION An object of the present invention is to provide apparatus for producing a contour enhancement signal that enhances the contours of a video signal without overenhancing already fine contours.
Another object of the present invention is to provide apparatus for producing a contour enhancement signal that enhances the contours of a video signal without introducing noise into the video signal which substantially affects the quality of the image represented by the video signal.
More specifically, it is an object of the present invention to prevent signal deterioration caused by contour enhancement which is characteristic of digital contour enhancement circuits utilizing a clipping circuit to limit the detail signal.
A still further object of the present invention is to provide apparatus for producing a contour enhancement signal that is limited between two predetermined levels without overshoot.
In accordance with an aspect of the present invention, a digital processing apparatus for correcting an image enhancement signal having a shape is provided which includes a peak detector for detecting and holding the peak levels of the image enhancement signal and an adjustment device, responsive to the peak levels, for correcting the image enhancement signal to reduce its peak levels while substantially maintaining its shape.
In accordance with another aspect of the present invention, a digital processing apparatus for correcting an image enhancement signal having a shape is provided which includes an envelope detector for detecting the envelope of the image enhancement signal and an adjustment device, responsive to the envelope, for correcting the image enhancement signal to reduce its peak levels while substantially maintaining its shape.
In accordance with yet another aspect of the present invention, a digital processing apparatus for generating a contour enhancement signal for a video signal is provided which includes a generating device for generating a contour signal representative of a contour represented by the video signal and a correction device for correcting the contour signal to prevent substantial overenhancement of a fine contour represented by the video signal

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