Video Coding Units with Zero Residual for Large Transform Blocks
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Solution Overview
Problem
Current video coding standards face inefficiencies in handling large size coding units, particularly in next-generation standards like VVC, where large CTU sizes exceed the maximum TU size, leading to forced splitting that reduces compression efficiency and violates the one CU containing one TU rule.
Innovation Solution
Implementing a zero residual method where large size CUs are set to zero residual when exceeding a maximum size threshold, allowing them to be encoded or decoded without further splitting, maintaining the one CU containing one TU rule while supporting larger transform sizes without additional processing modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large size CTUs are processed by forcing splits to meet maximum TU size requirements, then transform processing constraints are satisfied, but compression efficiency deteriorates and the one CU containing one TU rule is violated
Solution Approach 1:
The patent changes the parameter of residual values by setting them to zero for large CUs, allowing the CU size to exceed maximum TU size without violating transform processing constraints. This parameter change enables large CU processing while maintaining the one CU containing one TU rule and avoiding forced splits, thereby preserving compression efficiency.
2Device complexity
If large size CUs are processed without additional processing modules, then device complexity is reduced, but support for larger transform sizes is limited
Solution Approach 1:
By setting residual values to zero, the patent enables the system to handle CUs of any size without requiring additional processing modules for larger transforms. This parameter-based solution provides adaptability to larger transform sizes while keeping device complexity low, as no new hardware or software modules are needed.
Solution Approach 2:
The patent uses a simple, lightweight approach by setting residuals to zero rather than implementing complex additional processing modules. This disposable-like solution (simple parameter setting) provides the needed functionality without the overhead of permanent, complex processing infrastructure.
3Reliability
If forced splitting is applied to large CUs to meet maximum TU size, then transform processing constraints are satisfied, but computational complexity increases
Solution Approach 1:
The patent changes the residual parameter to zero for large CUs, which satisfies transform processing constraints without requiring the complex computational operations of forced splitting. This avoids the computational overhead of dividing large CUs into smaller TUs while maintaining constraint compliance.
Data Source
AI summary
Video data processing methods and apparatuses in a video encoding or decoding system for processing a slice partitioned into Coding Units (CUs). The video encoding or decoding system receives input data of a current CU and checks a size of the current CU. The residual of the current CU is set to zero or the current CU is coded in Skip mode if the size of the current CU is greater than a maximum size threshold value. A CU with zero residual implies coefficient level values in one or more corresponding transform blocks are all zero, complicated transform processing for large size blocks is therefore avoided.