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US 7,599,551 B2Granted
Color correction device and color correction method
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsMariko Takahashi, Narihiro Matoba
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Abstract
A color correction apparatus is provided including a color correction means 1 for making a color correction to an input image signal 101, and a color gamut compression means 2 for performing color gamut compression on the color-corrected input image signal based on color reproduction characteristics data 103 describing color reproduction characteristics so that the color-corrected image data outputted from the color correction means 1 has a chromaticity range which is contained in a color reproduction region which is based on the color reproduction characteristics.
Claims26
A color correction apparatus comprising:
- a color corrector that makes a color correction to an input image signal;
- and
- a color gamut compressor that performs color gamut compression on the color-corrected color-corrected image data outputted from said color corrector has a chromaticity range which is corrected image data outputted from said color corrector has a chromaticity range which is contained in a color reproduction region which is based on said color reproduction characteristics wherein:
- said color gamut compressor determines a hue of the image data converted by said color corrector, acquires both:
- an input chromaticity range from the input image signal based on the data describing the color reproduction characteristics, said input chromaticity range indicating said color reproduction characteristics corresponding to a hue of the input image signal, and
- an output chromaticity range based on the data describing the color reproduction characteristics, said output range indicating said color reproduction characteristics corresponding to the hue of the image data converted by said color corrector.
3 more elements
A color correction apparatus comprising:
- a saturation conversion means for converting a saturation of an input image signal based on both color adjustment data describing both a hue to be saturation-converted and an amount of adjustment, and color reproduction characteristics data describing color reproduction characteristics of a color image display apparatus.
A color correction method comprising:
- converting a hue indicated by image data using a hue converter;
- converting a value indicated by the image data acquired from said hue converter using a value converter;
- converting a saturation indicated by the image data acquired from said value converter based on color reproduction characteristics data describing color reproduction characteristics of a color image display apparatus using a saturation converter;
- and
- carrying out color gamut compression so that the image data acquired from said saturation converter has a chromaticity range which is contained in a color reproduction region which is based on said color reproduction characteristics using a color gamut compressor wherein said color gamut compressor determines a hue of the image data converted by said color corrector, acquires both:
- an input chromaticity range from the image data based on the data describing the color reproduction characteristics, said input chromaticity range indicating said color reproduction characteristics corresponding to a hue of the input image signal, and
- an output chromaticity range based on the data describing the color reproduction characteristics, said output range indicating said color reproduction characteristics corresponding to the hue of the image data converted by said color corrector.
4 more elements
A color correction apparatus comprising:
- a color corrector that color-corrects an input image signal;
- and
- a color gamut compressor that:
- input acquires an input chromaticity range from the input image signal based on data describing color reproduction characteristics, said input chromaticity range indicating said color reproduction characteristics corresponding to a hue of the input image signal;
- determines a hue of the color-corrected image signal;
- output acquires an output chromaticity range based on the data describing the color reproduction characteristics, said output chromaticity range indicating those color reproduction characteristics that correspond to the determined hue of the color-corrected image signal;
- and
- compresses a color gamut of the color-corrected image signal based on the data describing the color reproduction characteristics, thereby establishing a chromaticity range for the gamut-compressed image signal such that said chromaticity range is contained in a color reproduction region based on said color reproduction characteristics.
5 more elements
A color correction apparatus comprising:
- a saturation converter that converts a saturation of an input image signal based on color adjustment data describing both a hue to be saturation-converted and an amount of adjustment, and color reproduction characteristics data describing color reproduction characteristics of a color image display apparatus.
A color correction method comprising:
- converting a hue indicated by image data;
- converting a value indicated by the hue-converted image data;
- converting a saturation indicated by the value-converted image data based on color reproduction characteristics data describing color reproduction characteristics of a color image display apparatus;
- and
- compressing a color gamut of the image data such that the saturation-converted image data has a chromaticity range within a color reproduction region based on said color reproduction characteristics, where compressing a color gamut includes:
- determining a hue of the hue-converted image data
- first acquiring an input chromaticity range from the image data based on the data describing the color reproduction characteristics, said input chromaticity range indicating said color reproduction characteristics corresponding to a hue of the image data, and
- second acquiring an output chromaticity range based on the data describing the color reproduction characteristics, said output range indicating said color reproduction characteristics corresponding to the hue of the hue-converted image data.
5 more elements
Dependencies are inferred from the claim text.