Noise reduction apparatus for electronic edge enhancement

Details Noise reduction apparatus for electronic edge enhancement Noise reduction apparatus for electronic edge enhancement

1997-11-03

2000-08-01

Lee, Thomas D.

Image analysis

Image enhancement or restoration

Edge or contour enhancement

382199, H04N 140

Patent

active

060978481

ABSTRACT:
A video signal processor includes an edge enhancement determining circuit that senses the amount of some characteristic of that signal which provides a measure of noise inherent in the signal, precisely determines a preferred amount of edge enhancement to be applied to a video signal as a function of that characteristic, and applies that amount of edge enhancement to the video signal. The video signal characteristic, used to determine the noise content of the video signal includes the amount of automatic gain control amplification and the brightness of the viewed scene. Thus, the amount of edge enhancement added to the video signal is adaptively controlled according to the brightness level of the viewed scene and the amplification level of the video signal by the automatic gain control circuit, and provides the proper amount of edge sharpness to the viewed video scene as a function of its noise content. This provides an increase in perceived sharpness of the viewed image, without an increase in background noise that occurs in conventional non-adaptive systems.

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