Coring device, luminance processor using coring device, and methods thereof
AssigneeSamsung Electronics Co., Ltd.
InventorGye-wook Jo
Life of this patent
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Abstract
A coring device provide with a signal receiving part which receives luminance signals, and a coring part which linearly outputs an output luminance signal by applying a coring slope corresponding to a preset critical luminance level to only an input luminance signal, which is the critical luminance level or more, among the luminance signals. The coring slope means the slope when input luminance signals from the critical luminance level to the maximum input luminance level match with all the range of output luminance level. Accordingly, a gain of a high gradation signal in a high frequency band can be compensated, and the sharpness of the image quality can be improved.
Claims24
A coring device, comprising:
- a signal receiving part which receives an input luminance signal;
- and
- a coring part which linearly outputs an output luminance signal by applying a coring slope corresponding to a preset critical luminance level to only that portion of the received input luminance signal which is at the critical luminance level or greater.
A luminance processor, comprising:
- a high-pass filter which passes only a high frequency portion of an input luminance signal;
- a subtracter which removes the portion of the luminance signal passed by the high-pass filter from the input luminance signal and outputs a luminance signal of a low frequency band;
- a coring device which linearly outputs an output luminance signal by applying a coring slope corresponding to a preset critical luminance level to only that portion of the high frequency portion of the luminance signal which is at the critical luminance level or greater,;
- and
- an adder which adds the output luminance signal calculated from the coring device and the luminance signal of the low frequency band output from the subtracter.
A coring method, comprising:
- (a) receiving a luminance signal;
- (b) detecting a portion of an input luminance signal whose luminance level is a preset critical luminance level or greater;
- and
- (c) linearly outputting an output luminance signal by applying a coring slope corresponding to the critical luminance level to the detected portion of the input luminance signal.
A luminance processing method, comprising:
- (a) passing only a high frequency band portion of an input luminance signal using a high-pass filter;
- (b) removing the high frequency band portion from the input luminance signal using a subtracter and outputting a luminance signal of a low frequency band;
- (c) detecting that portion of the input luminance signal whose luminance level is a preset critical luminance level or greater;
- (d) linearly outputting an output luminance signal by applying a coring slope corresponding to the critical luminance level to the detected portion of the input luminance signal;
- and
- (e) adding the linearly calculated output luminance signal and the luminance signal of the low frequency band output in operation (b) to generate a final output luminance signal.
Dependencies are inferred from the claim text.