Digital gamma correction circuit and digital gamma...

Television – Image signal processing circuitry specific to television – Gray scale transformation

Reexamination Certificate

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C348S254000, C358S519000

Reexamination Certificate

active

08077261

ABSTRACT:
A correction characteristic storage portion stores coordinates (Xp,Yp) of a break point P and curve approximation range widths Wa and Wb. A basic broken line coefficient calculation portion calculates a coefficient C1for a straight line OP and a coefficient C2for a straight line PP′. An auxiliary straight line coefficient calculation portion obtains division points P and Q at which to divide two line segments AP and PB in the proportion in which a curve approximation range is divided by input data X, and calculates a coefficient C0for an auxiliary straight line PQ. A range determination portion determines whether the input data lies within the curve approximation range. A coefficient selection portion and a primary expression calculation portion perform either correction based on the basic broken line or correction based on the auxiliary straight line according to the determination.

REFERENCES:
patent: 5243426 (1993-09-01), Murayama et al.
patent: 5408267 (1995-04-01), Main
patent: 6573934 (2003-06-01), Lee
patent: 2005/0276502 (2005-12-01), Brown et al.
patent: 2007/0091021 (2007-04-01), Uota
patent: 8-51557 (1996-02-01), None
patent: 11-32237 (1999-02-01), None
patent: 11-120344 (1999-04-01), None

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