Television – Image signal processing circuitry specific to television – Transition or edge sharpeners
Reexamination Certificate
2005-03-03
2008-09-02
Hsia, Sherrie (Department: 2622)
Television
Image signal processing circuitry specific to television
Transition or edge sharpeners
C348S607000, C348S624000, C348S630000
Reexamination Certificate
active
07420623
ABSTRACT:
The structure of an image-signal processing apparatus for performing gamma correction and edge enhancement of a image signal is simplified. An edge-correction-gain generation circuit generates a gain signal according to the level of a image signal that has passed through an A-LPF on the basis of a preset transfer characteristic function. An edge-signal generation circuit generates an edge signal corresponding to the edge of the image according to the quadratic differential signal of the image signal. The edge signal is multiplied by the gain signal in a multiplying circuit. An edge-enhanced-signal generation circuit outputs it as an edge enhanced signal. The image signal is subjected to gamma correction by a gamma correction circuit in a different system from the edge-enhanced-signal generation circuit. A combining circuit combines the gamma-corrected image signal with the edge enhanced signal from the edge-enhanced-signal generation circuit.
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Hsia Sherrie
Oliff & Berridg,e PLC
Sanyo Electrical Co., Ltd.
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