PERCEPTUAL COLOR TRANSFORMATIONS FOR WIDE COLOR GAMUT VIDEO CODING
First Claim
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1. A computer-implemented method, comprising:
- converting an additive color model signal into a uniform color space signal having chromaticity components and a luminance component;
transforming the chromaticity components and the luminance component by applying a chromaticity-specific transform to the chromaticity components and applying a luminance-specific transform to the luminance component;
quantizing the transformed chromaticity components and luminance component; and
encoding the quantized chromaticity components and luminance component.
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Abstract
A video coding pipeline is provided that can accommodate high dynamic range (HDR) and wide color gamut (WCG) content at a fixed bitrate. The video coding pipeline relies on separate chromaticity and luminance-specific transforms in order to process image content. Image content may be converted into a nearly perceptually uniform color space for coding in constant luminance. Moreover, chromaticity transforms are utilized which reduce coding errors in the chroma components (at the fixed bitrate) by enlarging the distribution of code words for compression.
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Citations
20 Claims
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1. A computer-implemented method, comprising:
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converting an additive color model signal into a uniform color space signal having chromaticity components and a luminance component; transforming the chromaticity components and the luminance component by applying a chromaticity-specific transform to the chromaticity components and applying a luminance-specific transform to the luminance component; quantizing the transformed chromaticity components and luminance component; and encoding the quantized chromaticity components and luminance component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A non-transitory computer readable medium having computer executable program code embodied thereon, the computer executable program code configured to cause a processor to:
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decode quantized color and brightness components of an input bitstream carrying an image signal represented by a first color space model having brightness and color components; dequantize the quantized color and brightness components; apply a first inverse transform to the dequantized color component; apply a second inverse transform to the dequantized brightness component; and convert the image signal represented by a first color space model into that represented by a second color space model, the second color space model being an additive color space model. - View Dependent Claims (16, 17, 18)
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19. A system, comprising:
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a converter to convert an image signal represented by a first color space model into that represented by a second color space model having brightness and color components; a first transformer to apply a first transform to the color component; an opto-electrical transfer function encoder to apply a second transform to the brightness component; a quantizer to quantize the transformed color and brightness components; and an encoder to encode the quantized color and brightness components and output a bitstream. - View Dependent Claims (20)
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Specification