Inter Prediction Partition Limits for Lower-Bandwidth Video Coding

Solution Overview

Problem

The existing video encoding and decoding systems face issues with increased memory bandwidth and reduced video quality due to the use of small inter-PU partitions, particularly with the TMuC scheme, which strains memory bandwidth and increases the ratio of bits in the bitstream.

Innovation Solution

The solution involves restricting inter-PU partitions based on a predetermined minimum inter-PU size during video encoding and decoding, ensuring that only CUs larger than this minimum size can use inter-PU partitions, thereby reducing memory bandwidth and maintaining video quality by controlling the number of inter-PU partition type syntaxes in the bitstream.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If small inter-PU partitions are used to improve prediction precision, then manufacturing precision is improved, but memory bandwidth increases and device complexity increases

Engineering Contradiction:

Improveprediction precisionVSAvoidmemory bandwidth

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting the inter-PU partition size based on CU depth and minimum inter-PU size parameters. The encoding control means modifies the partitioning parameters adaptively, restricting inter-PU partitions to only those CUs whose size exceeds the minimum threshold, thereby optimizing the balance between prediction precision and memory bandwidth usage

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements dynamics by making the inter-PU partition capability dynamic rather than static. The system determines inter-PU partition eligibility based on real-time CU size comparisons with the minimum inter-PU size, allowing the partitioning structure to adapt flexibly to different coding scenarios and CU configurations

Inventive Principle:

Principle #15Dynamics

2Manufacturing precision

If small inter-PU partitions are used to improve prediction precision, then manufacturing precision is improved, but loss of information increases due to more syntax bits

Engineering Contradiction:

Improveprediction precisionVSAvoidbitstream overhead

Core Design Contradiction:

Manufacturing precisionVSLoss of information

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting the inter-PU partition size based on CU depth and minimum inter-PU size parameters. The encoding control means modifies the partitioning parameters adaptively, restricting inter-PU partitions to only those CUs whose size exceeds the minimum threshold, thereby optimizing the balance between prediction precision and memory bandwidth usage

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements dynamics by making the inter-PU partition capability dynamic rather than static. The system determines inter-PU partition eligibility based on real-time CU size comparisons with the minimum inter-PU size, allowing the partitioning structure to adapt flexibly to different coding scenarios and CU configurations

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20260082057A1Video decoding device and video encoding device using inter prediction

Publication Date: 2026.03.19 NEC CORP

AI summary

In a video decoding device for decoding video using inter prediction, decoding control means sets capable values of an inter-PU (Prediction Unit) partition type of a CU (Coding Unit) to be decoded, based on whether or not a size of the CU to be decoded is equal to a minimum inter-PU size.