Television – Image signal processing circuitry specific to television – Gray scale transformation
Reexamination Certificate
2007-04-03
2007-04-03
Kostak, Victor R. (Department: 2622)
Television
Image signal processing circuitry specific to television
Gray scale transformation
C348S672000
Reexamination Certificate
active
10343060
ABSTRACT:
In gray-scale correction where extension to a dynamic range is performed based on a maximum value and a minimum value of a video luminance signal, sufficient correction effects cannot be obtained in some displayed images. Therefore, a histogram detecting circuit (2), a maximum value detecting circuit (3), and a minimum value detecting circuit (4) respectively detects, for each field, a maximum value (Kmax) and a minimum value (Kmin) in a detection WINDOW set in a screen, and distribution information in a gray-scale direction. The detected maximum value (Kmax) and minimum value (Kmin) are respectively corrected by a maximum value correcting circuit (5) and a minimum value correcting circuit (6) based on the output results of the histogram detecting circuit (2), and output as a corrected maximum value (Lmax) and a corrected minimum value (Lmin). Based on these corrected maximum value (Lmax) and a corrected minimum value (Lmin), an input video luminance signal is corrected. Thus, it is possible to obtain optimal effects of gray-scale correction in accordance with a scene.
REFERENCES:
patent: 5742704 (1998-04-01), Suzuki et al.
patent: 5751846 (1998-05-01), Higgins-Luthman et al.
patent: 6111607 (2000-08-01), Kameyama
patent: 6111980 (2000-08-01), Sano et al.
patent: 6236751 (2001-05-01), Farrell
patent: 6825884 (2004-11-01), Horiuchi
patent: 2001/0033260 (2001-10-01), Nishitani et al.
patent: 2004/0175054 (2004-09-01), Ogata et al.
patent: 2004/0201562 (2004-10-01), Funamoto et al.
patent: 0 723 364 (1996-07-01), None
patent: 0 866 608 (1998-03-01), None
patent: 63-117589 (1988-05-01), None
patent: 2-309871 (1990-12-01), None
patent: 7-23287 (1995-01-01), None
patent: 10-248024 (1998-09-01), None
patent: 2000-324363 (2000-11-01), None
patent: 2001-27890 (2001-01-01), None
patent: 2001-134226 (2001-05-01), None
Kostak Victor R.
Matsushita Electric - Industrial Co., Ltd.
Wenderoth , Lind & Ponack, L.L.P.
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