Scalable Video Coding Temporal Sub-layer Presence Signaling
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Solution Overview
Problem
In scalable video coding (SVC), decoders face challenges in determining the presence of temporal sub-layers in a bitstream, which affects coding efficiency and computational complexity, as they currently need to parse bits at the slice level to identify whether temporal sub-layers are intentionally removed or lost during transmission.
Innovation Solution
The proposed solution involves determining presence information for temporal sub-layers at the sequence level, which is signaled in the bitstream, allowing decoders to optimize the decoding process by knowing whether missing sub-layers are intentionally removed or accidentally lost, thereby improving coding efficiency and reducing computational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If decoders parse bits at the slice level to determine temporal sub-layer presence, then they can identify whether sub-layers are intentionally removed or lost, but this increases computational complexity and reduces coding efficiency
Solution Approach 1:
The patent applies preliminary action by signaling temporal sub-layer presence information at the sequence parameter set (SPS) level before actual decoding operations. This allows decoders to know in advance which temporal sub-layers are present without needing to parse slice-level data, thereby reducing computational complexity while maintaining accurate detection capability
Solution Approach 2:
The patent segments the bitstream parsing process by separating temporal sub-layer presence information from the main slice-level data flow. The presence information is extracted and signaled independently at the SPS level, allowing decoders to handle this metadata separately from the main decoding pipeline, thus reducing overall computational burden
2Measurement precision
If decoders parse bits at the slice level to determine temporal sub-layer presence, then they can identify whether sub-layers are intentionally removed or lost, but this reduces coding efficiency
Solution Approach 1:
By signaling temporal sub-layer presence information at the SPS level before decoding operations begin, the patent enables decoders to optimize their processing paths in advance. This preliminary information allows for more efficient resource allocation and processing decisions throughout the decoding pipeline, thereby improving coding efficiency while maintaining accurate sub-layer detection
Solution Approach 2:
The patent moves the temporal sub-layer presence information from the temporal dimension (slice-level processing during decoding) to the hierarchical dimension (sequence parameter set level). This dimensional shift allows the information to be available earlier in the decoding hierarchy, improving overall coding efficiency without sacrificing detection accuracy
Data Source
AI summary
An apparatus configured to code (e.g., encode or decode) video information includes a memory unit and a processor in communication with the memory unit. The memory unit is configured to store video information associated with a video layer comprising one or more temporal sub-layers. The processor is configured to determine presence information for a coded video sequence in a bitstream, the presence information indicating whether said one or more temporal sub-layers of the video layer are present in the bitstream. The processor may encode or decode the video information.