Display Stream Codec Fallback Mode Signaling
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Solution Overview
Problem
Current display compression technologies, such as VESA's Display Codec for Mobile (VDC-M), face challenges in efficiently managing fallback modes, which require additional bits for signaling, increasing complexity and costs at higher compression ratios.
Innovation Solution
Implementing a display stream codec with a fallback display mode that uses the same signaling syntax as regular modes, allowing for reduced bit signaling by setting residues to zero and using the same mode-specific information, thereby simplifying the decoding process and reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fallback modes are implemented with separate signaling syntax, then display compression flexibility is improved, but device complexity and overhead increase
Solution Approach 1:
The patent merges fallback mode signaling with regular mode signaling by using the same syntax structure. The encoder and decoder treat fallback modes identically to regular modes, using unified mode-specific information and the same bitstream formatting, thereby eliminating separate signaling pathways and reducing overall system complexity while preserving compression flexibility
Solution Approach 2:
The signaling syntax is designed to be universal, serving both regular display modes and fallback display modes through a single standardized interface. The mode-specific information structure handles multiple mode types uniformly, allowing the same signaling mechanism to adapt to different compression scenarios without requiring mode-specific customization
2Measurement precision
If fallback modes use additional signaling bits, then mode representation accuracy is improved, but compression efficiency deteriorates
Solution Approach 1:
The patent applies homogeneity by making the signaling syntax for fallback modes identical to that of regular modes. Both mode types use the same syntax elements, bit allocation structures, and decoding procedures, ensuring uniform representation accuracy across all modes while avoiding the overhead of separate signaling systems that would reduce compression efficiency
3Measurement precision
If separate decoding processes are implemented for fallback modes, then decoding accuracy is improved, but processing time increases
Solution Approach 1:
The decoder implements a universal decoding process that handles both regular and fallback modes through identical operational pathways. The same decoding logic, syntax parsing routines, and reconstruction algorithms are applied regardless of mode type, eliminating the need for separate decoding processes and associated timing overhead while maintaining accurate mode-specific reconstruction
Data Source
AI summary
Provided is a display stream codec for a display device including an encoder, wherein the encoder is configured to determine a fallback display mode as a display mode for a current block to be encoded, represent a mode signaling of the fallback display mode that is identical to a mode signaling of a regular display mode corresponding to the fallback display mode, encode the current block in accordance with the fallback display mode using a same signaling syntax as the corresponding regular display mode, and send the encoded current block.