Picture Header Signaling for Low-Redundancy Video Syntax
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Solution Overview
Problem
Existing video compression techniques face challenges in achieving high compression ratios with minimal image quality degradation, particularly in the signaling of non-picture-level syntax elements, leading to inefficiencies in bandwidth usage and storage requirements.
Innovation Solution
The implementation of a method where non-picture-level syntax elements are signaled at the picture header level, with flags determining their presence in the header or slice headers, reducing redundancy and minimizing wasted bits in the encoded bitstream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If non-picture-level syntax elements are signaled in slice headers, then flexibility in slice-specific configuration is improved, but redundancy and wasted bits increase
Solution Approach 1:
The patent segments the syntax element signaling into two distinct locations: picture header for picture-level syntax elements and slice headers for slice-specific syntax elements. This segmentation allows the system to place redundancy-reducing logic at the appropriate hierarchical level, signaling picture-level elements once per picture rather than repeating them in every slice header.
Solution Approach 2:
The patent inverts the conventional approach by introducing a flag in the picture header that indicates whether non-picture-level syntax elements are present in slice headers. This inversion allows the system to default to the more efficient picture-level signaling while providing the option to use slice-level signaling when needed, thereby reducing redundancy in most cases.
2Productivity
If non-picture-level syntax elements are signaled at the picture header level, then compression efficiency is improved, but loss of slice-specific configuration capability occurs
Solution Approach 1:
The patent maintains segmentation between picture-level and slice-level syntax element signaling. Picture-level elements are signaled once in the picture header for efficiency, while slice-specific elements remain available in slice headers for configurations that vary across slices, thus preserving both compression efficiency and adaptability.
Solution Approach 2:
The patent introduces dynamic adaptability through the flag mechanism that allows the system to switch between picture-level and slice-level signaling based on the specific coding situation. This dynamic approach enables the system to optimize compression efficiency when picture-level signaling is sufficient while maintaining slice-specific configuration capability when needed.
3Adaptability or versatility
If all syntax elements are signaled in slice headers, then slice-specific configuration flexibility is maximized, but bit rate increases due to redundancy
Solution Approach 1:
The patent segments syntax element signaling by hierarchy: picture-level elements are signaled once in the picture header, reducing bit rate, while slice-specific elements are signaled only when needed in slice headers. This segmentation prevents redundant signaling of picture-level elements in every slice header while preserving slice-specific configuration flexibility.
Solution Approach 2:
The patent changes the signaling parameter structure by introducing a flag that indicates whether non-picture-level syntax elements are present in slice headers. This parameter change allows the system to adapt the signaling behavior based on the specific coding situation, reducing bit rate when picture-level signaling is sufficient while maintaining flexibility when slice-level signaling is needed.
Data Source
AI summary
A method comprises: receiving, by a video decoder, a video bitstream comprising an RPL flag, wherein the RPL flag equal to a first value specifies that RPL signaling is present in a PH, and wherein the RPL flag equal to a second value specifies that RPL signaling is not present in the PH and may be present in slice headers; and decoding, by the video decoder using the RPL flag, a coded picture to obtain a decoded picture. A comprises: receiving, by a video decoder, a video bitstream comprising an SAO flag, wherein the SAO flag specifies that SAO information may be present or is not present in a PH or specifies that the SAO information may be present or is not present in slice headers; and decoding, by the video decoder using the SAO flag, a coded picture to obtain a decoded picture.