Adaptive coring for video peaking

Details Adaptive coring for video peaking Adaptive coring for video peaking

2007-02-13

2007-02-13

Hsia, Sherrie (Department: 2622)

Television

Image signal processing circuitry specific to television

Transition or edge sharpeners

C348S627000, C348S712000

Reexamination Certificate

active

10850963

ABSTRACT:
A processor for enhancing an input luminance signal including: a circuit for calculating a chroma edge value associated with the input luminance signal; a circuit for measuring a luminance gradient associated with the input luminance signal; a peaking filter for processing the input luminance signal; a gain adjustment circuit having a gain function that is adjustable relative to the calculated chroma edge value, the gain adjustment circuit being operable to adjust the magnitude of the output of the peaking filter wherein: in a first range of luminance gradients, the output is an attenuated version of the input; in a second range of luminance gradients the output is directly proportional to the input; in a third range of luminance gradients, the output is inversely proportional to the input; wherein the enhanced luminance signal is the sum of the input and output of the peaking filter.

REFERENCES:
patent: 6377313 (2002-04-01), Yang et al.
patent: 7106386 (2006-09-01), Kobayashi

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