Television – Image signal processing circuitry specific to television – Gray scale transformation
Reexamination Certificate
2006-07-18
2010-11-23
Tran, Trang U (Department: 2622)
Television
Image signal processing circuitry specific to television
Gray scale transformation
C348S674000, C348S678000
Reexamination Certificate
active
07839455
ABSTRACT:
There is provided an image processing apparatus, an image display and an image processing method which are capable of preventing an unnatural change in image quality to image processing. A luminance distribution detecting circuit detects a luminance distribution as the histogram distribution of YUV signals. A gain calculating circuit and a gain limiter detect a gain variation on the basis of luminance distribution data. The gain limiter limits the gain variation to a gain variation threshold or less. The gain limiter and a delay circuit carry over the gain variation of a portion exceeding the gain variation threshold to the next image frame so as to modify the gain variation. A γ correction circuit performs image processing (contrast control) on the YUV signals on the basis of the gain variation modified.
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Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Sony Corporation
Tran Trang U
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