Video Bitstream Header Parsing for Early APS ID Extraction
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Solution Overview
Problem
The introduction of a picture header in the Versatile Video Coding (VVC) standard necessitates parsing a large number of parameters, increasing decoding complexity without significant improvements in coding performance.
Innovation Solution
Repositioning syntax elements related to APS ID information at the beginning of the picture and slice headers, allowing early parsing and reducing the need to parse the remainder of the header, thus simplifying the decoding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a picture header is introduced into the bitstream to specify syntax elements for decoding, then decoding capability is improved, but parsing complexity increases due to the large number of parameters that need to be parsed
Solution Approach 1:
The patent applies preliminary action by repositioning APS ID syntax elements to the beginning of the picture header and slice header, enabling early parsing of these elements before other decoding parameters. This allows streaming applications to extract and process APS ID information without needing to parse the entire header, thereby reducing parsing complexity while maintaining full decoding capability.
2Reliability
If all syntax elements are parsed to ensure complete decoding, then decoding accuracy is maintained, but processing time increases for streaming applications
Solution Approach 1:
The patent extracts and separates APS ID syntax elements from the rest of the header parameters by repositioning them at the beginning. This extraction enables streaming applications to selectively parse only the APS ID information when needed, rather than parsing the entire header, thus reducing processing time while maintaining decoding accuracy for the extracted information.
3Ease of operation
If syntax elements are repositioned to the beginning of headers, then parsing complexity is reduced for streaming applications, but header structure changes
Solution Approach 1:
The patent segments the header structure by separating APS ID syntax elements from other decoding parameters and repositioning them to the beginning. This segmentation creates a clear division where APS ID information can be independently parsed and processed, simplifying the parsing operation for streaming applications while the overall header structure remains valid for complete decoding.
Data Source
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AI summary
The disclosure relates to a method of decoding video data from a bitstream, the bitstream comprising video data corresponding to one or more slices. The bitstream comprises a picture header comprising syntax elements to be used when decoding one or more slices, and a slice header comprising syntax elements to be used when decoding a slice. The decoding comprises parsing, in the picture header at least one syntax element indicating whether a decoding tool may be used in the picture. When the decoding tool is used in the picture, at least one APS ID related syntax element is parsed for the decoding tool in the picture header. The decoding also comprises parsing, in a slice header, at least one syntax element indicating whether the decoding tool is to be used or not for that slice prior to syntax elements relating to other decoding tools. A bitstream is decoded using said syntax elements. Related encoding methods, devices and computer programs are also disclosed.