HDR Decoder Dynamic Range Mapping Backward Compatibility

The patent applies preliminary action by pre-defining multiple mapping tables with different mapping relations before decoding operations. The encoder signals which mapping table to use through mapping information in the bitstream, allowing the decoder to directly apply the appropriate pre-prepared mapping relation without performing complex real-time calculations, thus improving processing efficiency while controlling complexity.

The patent implements parameter changes by using multiple mapping tables that define different mapping relations between base layer and enhancement layer image signals. Each mapping table corresponds to different parameter settings (mapping relations), and the decoder selects and applies the appropriate mapping table based on mapping information signaled by the encoder, enabling flexible adaptation to different content characteristics.

The patent achieves universality by designing a decoding architecture that can handle both traditional decoding scenarios and HDR-specific DR mapping scenarios through a unified framework. The decoder is equipped with multiple mapping tables and can select appropriate mapping relations based on mapping information in the bitstream, allowing it to function as a general-purpose decoder for standard content while simultaneously adapting to HDR content with extended dynamic range requirements.

The patent applies dynamics by making the mapping relation flexible and selectable rather than fixed. The decoder dynamically chooses which mapping table to apply based on mapping information signaled by the encoder, enabling the system to adapt its behavior to match the specific requirements of different content types while maintaining a consistent interface and operation mode for users.