Signaling bit depth values for 3D color prediction for color gamut scalability
First Claim
1. A method of decoding video data, the method comprising:
- receiving a first syntax element indicating a first bit depth for an input luma component of a three-dimensional (3D) lookup table for color gamut scalability, the first bit depth being constrained to be equal to a bit depth of a luma component of a reference layer picture in a reference layer of the video data, and wherein the first bit depth is constrained to be not different than the bit depth of the luma component of the reference layer picture in the reference layer of the video data;
receiving a second syntax element indicating a second bit depth for input chroma components of the 3D lookup table, the second bit depth being constrained to be equal to a bit depth of chroma components of the reference layer picture, and wherein the second bit depth is constrained to be not different than the bit depth of chroma components of the reference layer picture;
applying the 3D lookup table directly to the luma component and the chroma components of the reference layer picture to convert the luma component and the chroma components of the reference layer picture from a first color gamut for the reference layer of the video data to a second color gamut for an enhancement layer of the video data, wherein applying the 3D lookup table directly to the luma component and the chroma components of the reference layer picture comprises using the luma component and the chroma components of the reference layer picture as input of the 3D lookup table having bit depths equal to the first bit depth for the input luma component and the second bit depth for the input chroma components, respectively, of the 3D lookup table;
generating an inter-layer reference picture for an enhancement layer picture in the enhancement layer of the video data based on the converted luma component and the converted chroma components of the reference layer picture; and
decoding video blocks of the enhancement layer picture based on the inter-layer reference picture generated using the 3D lookup table.
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Abstract
Techniques are described for performing constrained three-dimensional (3D) color prediction for color gamut scalability in video coding. Color prediction techniques for color gamut scalability may be used by video coders to generate inter-layer reference pictures when a color gamut for a reference layer of video data is different than a color gamut for an enhancement layer of the video data, or when a bit depth of the reference layer is different than a bit depth of the enhancement layer. According to the techniques, a video coder may perform 3D color prediction with constrained bit depths of input and output color components of the 3D lookup table. According to further techniques, in the case of multiple layers, a video coder may perform 3D color prediction with constrained application to reference pictures in only one or more identified reference layers.
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Citations
16 Claims
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1. A method of decoding video data, the method comprising:
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receiving a first syntax element indicating a first bit depth for an input luma component of a three-dimensional (3D) lookup table for color gamut scalability, the first bit depth being constrained to be equal to a bit depth of a luma component of a reference layer picture in a reference layer of the video data, and wherein the first bit depth is constrained to be not different than the bit depth of the luma component of the reference layer picture in the reference layer of the video data; receiving a second syntax element indicating a second bit depth for input chroma components of the 3D lookup table, the second bit depth being constrained to be equal to a bit depth of chroma components of the reference layer picture, and wherein the second bit depth is constrained to be not different than the bit depth of chroma components of the reference layer picture; applying the 3D lookup table directly to the luma component and the chroma components of the reference layer picture to convert the luma component and the chroma components of the reference layer picture from a first color gamut for the reference layer of the video data to a second color gamut for an enhancement layer of the video data, wherein applying the 3D lookup table directly to the luma component and the chroma components of the reference layer picture comprises using the luma component and the chroma components of the reference layer picture as input of the 3D lookup table having bit depths equal to the first bit depth for the input luma component and the second bit depth for the input chroma components, respectively, of the 3D lookup table; generating an inter-layer reference picture for an enhancement layer picture in the enhancement layer of the video data based on the converted luma component and the converted chroma components of the reference layer picture; and decoding video blocks of the enhancement layer picture based on the inter-layer reference picture generated using the 3D lookup table. - View Dependent Claims (2, 3)
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4. A method of encoding video data, the method comprising:
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constraining a first bit depth for an input luma component of a three-dimensional (3D) lookup table for color gamut scalability to be equal to a bit depth of a luma component of a reference layer picture in a reference layer of the video data, wherein the first bit depth is constrained to be not different than the bit depth of the luma component of the reference layer picture in the reference layer of the video data; constraining a second bit depth for input chroma components of the 3D lookup table to be equal to a bit depth of chroma components of the reference layer picture, wherein the second bit depth is constrained to be not different than the bit depth of chroma components of the reference layer picture; applying the 3D lookup table directly to the luma component and the chroma components of the reference layer picture to convert the luma component and the chroma components of the reference layer picture from a first color gamut for the reference layer of the video data to a second color gamut for an enhancement layer of the video data, wherein applying the 3D lookup table directly to the luma component and the chroma components of the reference layer picture comprises using the luma component and the chroma components of the reference layer picture as input of the 3D lookup table having bit depths equal to the first bit depth for the input luma component and the second bit depth for the input chroma components, respectively, of the 3D lookup table; generating an inter-layer reference picture for an enhancement layer picture in the enhancement layer of the video data based on the converted luma component and the converted chroma components of the reference layer picture; encoding video blocks in the enhancement layer picture based on the inter-layer reference picture generated using the 3D lookup table;
signaling a first syntax element indicating the first bit depth for the input luma component of the 3D lookup table; andsignaling a second syntax element indicating the second bit depth for the input chroma components of the 3D lookup table. - View Dependent Claims (5, 6)
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7. A video decoding device comprising:
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a memory configured to store video data; and one or more processors in communication with the memory and configured to; receive a first syntax element indicating a first bit depth for an input luma component of a three-dimensional (3D) lookup table for color gamut scalability, the first bit depth being constrained to be equal to a bit depth of a luma component of a reference layer picture in a reference layer of the video data, and wherein the first bit depth is constrained to be not different than the bit depth of the luma component of the reference layer picture in the reference layer of the video data; receive a second syntax element indicating a second bit depth for input chroma components of the 3D lookup table, the second bit depth being constrained to be equal to a bit depth of chroma components of the reference layer picture, and wherein the second bit depth is constrained to be not different than the bit depth of chroma components of the reference layer picture; apply the 3D lookup table directly to the luma component and the chroma components of the reference layer picture to convert the luma component and the chroma components of the reference layer picture from a first color gamut for the reference layer of the video data to a second color gamut for an enhancement layer of the video data, wherein, to apply the 3D lookup table directly to the luma component and the chroma components of the reference layer picture, the one or more processors are configured to use the luma component and the chroma components of the reference layer picture as input of the 3D lookup table having bit depths equal to the first bit depth for the input luma component and the second bit depth for the input chroma components, respectively, of the 3D lookup table; generate an inter-layer reference picture for an enhancement layer picture in the enhancement layer of the video data based on the converted luma component and the converted chroma components of the reference layer picture; and decode video blocks of the enhancement layer picture based on the inter-layer reference picture generated using the 3D lookup table. - View Dependent Claims (8, 9)
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10. A video encoding device comprising:
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a memory configured to store video data; and one or more processors in communication with the memory and configured to; constrain a first bit depth for an input luma component of a three-dimensional (3D) lookup table for color gamut scalability to be equal to a bit depth of a luma component of a reference layer picture in a reference layer of the video data, wherein the first bit depth is constrained to be not different than the bit depth of the luma component of the reference layer picture in the reference layer of the video data; constrain a second bit depth for input chroma components of the 3D lookup table to be equal to a bit depth of chroma components of the reference layer picture, wherein the second bit depth is constrained to be not different than the bit depth of chroma components of the reference layer picture; apply the 3D lookup table directly to the luma component and the chroma components of the reference layer picture to convert the luma component and the chroma components of the reference layer picture from a first color gamut for the reference layer of the video data to a second color gamut for an enhancement layer of the video data, wherein, to apply the 3D lookup table directly to the luma component and the chroma components of the reference layer picture, the one or more processors are configured to use the luma component and the chroma components of the reference layer picture as input of the 3D lookup table having bit depths equal to the first bit depth for the input luma component and the second bit depth for the input chroma components, respectively, of the 3D lookup table; generate an inter-layer reference picture for an enhancement layer picture in the enhancement layer of the video data based on the converted luma component and the converted chroma components of the reference layer picture; encode video blocks in the enhancement layer picture based on the inter-layer reference picture generated using the 3D lookup table; signal a first syntax element indicating the first bit depth for the input luma component of the 3D lookup table; and signal a second syntax element indicating the second bit depth for the input chroma components of the 3D lookup table. - View Dependent Claims (11, 12)
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13. A video encoding device comprising:
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means for constraining a first bit depth for an input luma component of a three-dimensional (3D) lookup table for color gamut scalability to be equal to a bit depth of a luma component of a reference layer picture in a reference layer of the video data, wherein the first bit depth is constrained to be not different than the bit depth of the luma component of the reference layer picture in the reference layer of the video data; means for constraining a second bit depth for input chroma components of the 3D lookup table to be equal to a bit depth of chroma components of the reference layer picture, wherein the second bit depth is constrained to be not different than the bit depth of chroma components of the reference layer picture; means for applying the 3D lookup table directly to the luma component and the chroma components of the reference layer picture to convert the luma component and the chroma components of the reference layer picture from a first color gamut for the reference layer of the video data to a second color gamut for an enhancement layer of the video data, wherein the means for applying the 3D lookup table directly to the luma component and the chroma components of the reference layer picture comprise means for using the luma component and the chroma components of the reference layer picture as input of the 3D lookup table having bit depths equal to the first bit depth for the input luma component and the second bit depth for the input chroma components, respectively, of the 3D lookup table; means for generating an inter-layer reference picture for an enhancement layer picture in the enhancement layer of the video data based on the converted luma component and the converted chroma components of the reference layer picture; means for encoding video blocks of the enhancement layer picture based on the inter-layer reference picture generated using the 3D lookup table; means for signaling a first syntax element indicating the first bit depth for the input luma component of the 3D lookup table; and means for signaling a second syntax element indicating the second bit depth for the input chroma components of the 3D lookup table. - View Dependent Claims (14)
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15. A non-transitory computer-readable storage medium storing instructions for encoding video data that, when executed, cause one or more processors to:
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constrain a first bit depth for an input luma component of a three-dimensional (3D) lookup table for color gamut scalability to be equal to a bit depth of a luma component of a reference layer picture in a reference layer of the video data, wherein the first bit depth is constrained to be not different than the bit depth of the luma component of the reference layer picture in the reference layer of the video data; constrain a second bit depth for input chroma components of the 3D lookup table to be equal to a bit depth of chroma components of the reference layer picture, wherein the second bit depth is constrained to be not different than the bit depth of chroma components of the reference layer picture; apply the 3D lookup table directly to the luma component and the chroma components of the reference layer picture to convert the luma component and the chroma components of the reference layer picture from a first color gamut for the reference layer of the video data to a second color gamut for an enhancement layer of the video data, wherein, to apply the 3D lookup table directly to the luma component and the chroma components of the reference layer picture, the instructions cause the one or more processors to use the luma component and the chroma components of the reference layer picture as input of the 3D lookup table having bit depths equal to the first bit depth for the input luma component and the second bit depth for the input chroma components, respectively, of the 3D lookup table; generate an inter-layer reference picture for an enhancement layer picture in the enhancement layer of the video data based on the converted luma component and the converted chroma components of the reference layer picture; encode video blocks of the enhancement layer picture based on the inter-layer reference picture generated using the 3D lookup table; signal a first syntax element indicating the first bit depth for the input luma component of the 3D lookup table; and signaling a second syntax element indicating the second bit depth for the input chroma components of the 3D lookup table. - View Dependent Claims (16)
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Specification