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US 12,341,994 B2Granted
Apparatus, a method and a computer program for video coding and decoding
AssigneeNokia Technologies Oy
InventorsJani Lainema, Ramin Ghaznavi Youvalari
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Abstract
A method comprising: determining a first sample in an input color space (500); determining a component of the input color space that the first sample represents (502); determining a pre-quantizer based on the determined component (504); quantizing the first sample using the determined pre-quantizer (506); and encoding the first sample value with video or image coding means (508).
Claims20
An apparatus comprising:
- at least one processor;
- and
- at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to:
- determine a first sample in an input color space;
- determine a component of the input color space that the first sample represents;
- determine a pre-quantizer based on the determined component;
- determine a quantization parameter for the pre-quantizer or a post-quantizer;
- indicate the quantization parameter in a bitstream;
- quantize the first sample using the determined pre-quantizer before color space conversion;
- and
- encode the first sample value with video or image coding means.
8 more elements
A method comprising:
- determining a first sample in an input color space;
- determining a component of the input color space that the first sample represents;
- determining a pre-quantizer based on the determined component;
- determining a quantization parameter for the pre-quantizer or a post-quantizer;
- indicating the quantization parameter in a bitstream;
- quantizing the first sample using the determined pre-quantizer before color space conversion;
- and
- encoding the first sample value with video or image coding means.
5 more elements
An apparatus comprising:
- at least one processor;
- and
- at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to:
- decode at least a first sample value with video or image decoding means;
- perform a color space transform operation comprising a mapping of the first sample value in a first color space to a second sample value in a second color space;
- select a post-quantizer for the second sample value based on which output color space component the second sample represents;
- decode a quantization parameter from a bitstream;
- determine a dequantization parameter for the post-quantizer based on the decoded quantization parameter;
- and
- dequantize the second sample value with the selected post-quantizer after inverse color space conversion.
7 more elements
A method comprising:
- decoding at least a first sample value with video or image decoding means;
- performing a color space transform operation comprising mapping of the first sample value in a first color space to a second sample value in a second color space;
- selecting a post-quantizer for the second sample value based on which output color space component the second sample represents;
- decoding a quantization parameter from a bitstream;
- determining a dequantization parameter for the post-quantizer based on the decoded quantization parameter;
- and
- dequantizing the second sample value with the selected post-quantizer after inverse color space conversion.
4 more elements
Dependencies are inferred from the claim text.