Difference Vector Suffix Signaling for Lower-Bitrate Video Coding
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Solution Overview
Problem
Existing video encoding technologies face challenges in efficiently compressing and transmitting large video sequences due to the large data size, which can be exacerbated by the complexity of screen content and the need for improved prediction techniques to reduce redundant information.
Innovation Solution
Implementing a video coding system that utilizes advanced prediction techniques such as intra-frame and inter-frame prediction, combined with quadtree+multi-type tree partitioning and context-based adaptive binary arithmetic coding (CABAC) to enhance compression efficiency and reduce redundant data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If advanced prediction techniques and partitioning methods are used, then compression efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies quadtree+multi-type tree partitioning to divide video blocks into smaller sub-blocks with different partitioning types (QT, BT, TT, RT). This segmentation allows the encoder to adaptively select the most suitable partitioning structure for different content regions, improving compression efficiency while managing complexity through structured division of the coding task
Solution Approach 2:
The patent implements dynamic prediction by selecting from multiple prediction modes (intra-frame, inter-frame, and intra-block copy) and adapting the prediction strategy based on content characteristics. The use of multiple reference blocks and adaptive reference index selection further enhances dynamics, allowing the system to optimize prediction accuracy for diverse video content while maintaining manageable complexity through conditional logic
2Reliability
If multiple prediction modes and reference blocks are used, then video quality is maintained, but bitrate increases
Solution Approach 1:
The patent employs feedback mechanisms through rate-distortion optimization (RDO) that evaluates multiple prediction modes and selects the one providing the best quality-bitrate tradeoff. The RDO cost function incorporates both distortion metrics and bitrate considerations, allowing the system to maintain video quality while controlling bitrate by selecting the most efficient prediction mode for each block
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting prediction parameters such as reference block indices, motion vector precision, and partitioning depth based on content characteristics. These parameter adaptations allow the system to maintain high video quality for complex regions while using more compact representations for simpler regions, thereby controlling overall bitrate
3Productivity
If context-based adaptive binary arithmetic coding is used, then compression efficiency is improved, but encoding complexity increases
Solution Approach 1:
The patent applies context-based adaptive binary arithmetic coding (CABAC) which performs preliminary setup by defining multiple context models for different syntax elements before actual encoding. These context models are prepared in advance and adaptively updated during encoding, allowing efficient probability estimation without requiring complex real-time calculations, thus improving compression efficiency while managing encoding complexity
Data Source
AI summary
A decoder receives a first one or more symbols in a bitstream to obtain a prefix of a magnitude of a difference vector for a current block. The decoder determines, after obtaining the prefix and based on a status of a flag in the received bitstream, whether or not the received bitstream includes a second one or more symbols of a suffix of the magnitude, and whether, when the received bitstream includes the second one or more symbols, the second one or more symbols comprise at least one context-coded symbol. The decoder obtainins the suffix in accordance with the determining and reconstructs the current block based on the difference vector with the magnitude represented by the obtained prefix and suffix.