Apparatus for controlling color temperature
AssigneeLG Electronics Inc.
InventorsYoon Seok CHOI, Hun Cheol Lee, Hak Tae Kim
Life of this patent
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Abstract
Disclosed is the apparatus for controlling color temperature enabling the color region determiner to determine whether the inputted chroma signal value in pixels belongs to a pre-set achromatic color region or a chromatic color region, and the color temperature corrector to correct the chroma signal gains according to the determined achromatic color region or chromatic color region.
Claims29
an apparatus for controlling color temperature comprising:
- a color region determiner determining whether values of luminance signal and chroma signals belong to a predetermined achromatic color region or a chromatic color region;
- and a color temperature corrector correcting a color temperature by controlling gains of the luminance signal and chroma signals as a result of the determination by the color region determiner, wherein the values of achromatic color region set up by the color region determiner are such that the value of the luminance signal (Y) satisfies the condition of 0≦Y≦Ya (where, Ya is a predetermined experimental value), the chroma signals (U, V) satisfy all the conditions of −Ua≦U≦Ua and −Va≦V≦Va (where, Ua and Va are predetermined experimental values) on a UV plan, where the achromatic color region on a quadrant is a region that satisfies all the conditions of −Ua<U≦0 and 0≦V’Va.
An apparatus for controlling color temperature comprising:
- a color region determiner determining whether values of luminance signal and chroma signals belong to a predetermined achromatic color region or chromatic color region;
- and a color temperature corrector correcting a color temperature by controlling gains of the luminance signal and chroma signals as a result of the determination by the color region determiner, wherein the value of achromatic color region set up by the color region determiner is a region that satisfies the condition of U2+V2≦Ua2 on the UV plane, but the achromatic color region on a quadrant is a region that satisfies the condition of U2+V2<Ua2 (where, −Ua≦U≦0 and, 0≦V≦Va), wherein U and V are values of chroma signals (U, V), and Ua and Va are values of chroma signals preset by a user.
An apparatus for controlling color temperature comprising:
- a block divider dividing an YUV color space signal into a block of predetermined size;
- a color region determiner detecting pixels of achromatic color region existing within each block divided by the block divider and calculating the number of pixels in the achromatic region;
- and a color temperature corrector correcting the color temperature of pixels in the block outputted by the block divider, by calculating a luminance signal average value of pixels in the achromatic color region determined by the color region determiner, the number of pixels in the achromatic color region calculated by the color region determiner, an average value of chroma signal of each pixel and a corrected value of each pixel using the variation average value of chroma signals of each pixel.
An apparatus for controlling color temperature comprising:
- a color region determiner determining whether an inputted signal of RGB color space belongs to an achromatic color region or a chromatic color region;
- and a color temperature controller controlling a color temperature by multiplying a gain control value according to a determination signal of the color region determiner by the signal of the RGB color space.
Dependencies are inferred from the claim text.