Video Decoder Pipelined Processing Regions
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Solution Overview
Problem
Existing video coding standards face challenges in efficiently handling transformed blocks within pipelined architectures, leading to excessive implementation costs due to memory consumption and functional modules required.
Innovation Solution
A method for decoding a coding unit in an image frame from a bitstream involves determining the size of the coding unit, dividing the image frame into equally sized processing regions, and selecting a transform size that fits within the coding unit if it overlaps processing region boundaries, allowing for efficient decoding of transformed blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a coding unit overlaps processing region boundaries in a pipelined architecture, then the transform processing becomes complex requiring excessive memory and functional modules, but if the transform size is selected to fit within processing regions, then implementation cost is reduced while maintaining processing efficiency
Solution Approach 1:
The image frame is divided into multiple equally-sized processing regions that can be processed independently in parallel pipeline stages. By segmenting the transform processing into region-specific operations, the system avoids the complexity of handling cross-boundary transforms while maintaining overall processing efficiency through parallel execution of multiple pipeline stages.
2Quantity of substance
If the transform size is selected to fit within processing regions, then memory usage and functional modules are optimized, but the flexibility in handling various coding unit sizes is reduced
Solution Approach 1:
The system dynamically selects transform sizes from a plurality of available transform sizes based on the coding unit size and processing region boundaries. This dynamic adaptation allows the decoder to optimize for each specific coding unit while working within the constraints of the pipelined architecture, balancing memory efficiency with handling flexibility.
Solution Approach 2:
The transform size parameter is changed and selected from multiple available options depending on the specific coding unit being processed. By allowing the transform size to vary based on the coding unit dimensions and processing region alignment, the system achieves both memory optimization and adaptability to different coding scenarios.
3Reliability
If existing video coding standards are used with pipelined architectures, then compression performance is achieved, but implementation costs increase due to excessive memory consumption and functional modules
Solution Approach 1:
The decoding process is segmented into multiple pipeline stages, each handling a specific processing region. This segmentation allows compression performance to be maintained through proper processing while reducing implementation cost by limiting the memory and functional module requirements to only what is needed for each individual stage rather than the entire frame.
Solution Approach 2:
Each pipeline stage performs partial processing on a subset of the coding units (those within its processing region) rather than handling all coding units. This partial action approach maintains overall compression performance through the collective work of multiple stages while reducing the implementation burden on any single stage.
Data Source
AI summary
A method of decoding a coding unit in an image frame from a bitstream by determining a size of the coding unit from the bitstream; and dividing the image frame into a plurality of equally sized processing regions, each of the equally sized processing regions being smaller than a largest available coding unit size. The method also comprises selecting a motion vector corresponding to the coding unit from a list of candidate motion vectors, selecting the motion vector comprising (i) decoding a merge index if the coding unit is greater than or equal to a size than one of the determined processing regions, or (ii) decoding a skip flag to decode that the merge index if the coding unit is not greater than or equal to the size than one of the determined processing regions; and decoding the coding unit according to the selected motion vector for the coding unit.