Temporal Direct Motion Vector Selection for Higher Video Compression

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Solution Overview

Problem

The limitation of motion vectors in conventional temporal direct coding to only refer forward in display order hinders the derivation of the most suitable motion vector, leading to decreased compression rates in moving picture coding.

Innovation Solution

Adaptive selection of motion vectors in temporal direct by determining the presence of forward or backward reference motion vectors in the reference block, calculating candidate motion vectors through scaling, and coding the current block using the most suitable vector.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If motion vectors are limited to refer forward in display order only, then the coding process is simplified, but the compression rate decreases

Engineering Contradiction:

Improvecoding process complexityVSAvoidcompression rate

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent applies dynamics by making the reference direction (forward or backward) adaptable rather than fixed. The system dynamically selects whether to use forward reference motion vectors or backward reference motion vectors based on the specific coding situation, allowing the coding process to adapt to different scenarios while maintaining simplicity.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of reference direction by introducing a determination step that selects between forward and backward reference motion vectors. This parameter change allows the system to optimize compression rate by choosing the appropriate reference direction for each current block, rather than being constrained to forward references only.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If adaptive selection of motion vectors is implemented, then the compression rate increases, but the device complexity increases

Engineering Contradiction:

Improvecompression rateVSAvoidcoding process complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the motion vector selection process into distinct steps: determining the reference direction, selecting reference motion vectors based on that direction, and coding the current block. This segmentation makes the adaptive selection process more manageable and less complex by breaking it down into modular operations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent performs preliminary action by determining the reference direction and selecting reference motion vectors before coding the current block. This preliminary preparation simplifies the actual coding process by having the optimal motion vectors ready in advance, reducing the complexity of the main coding operation.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20260075234A1Moving picture coding method and moving picture decoding method using a determination whether or not a reference block has two reference motion vectors that refer forward in display order with respect to a current picture

Publication Date: 2026.03.12 SUN PATENT TRUST

AI summary

A moving picture coding apparatus includes: an inter prediction control unit which determines to code a motion vector using, among candidate predicted motion vectors, a candidate predicted motion vector having the least error with relative to a motion vector derived by motion estimation; a picture type determination unit which generates picture type information; a temporal direction vector calculation unit which derives a candidate predicted motion vector in temporal direct; and a co-located reference direction determination unit which generates, for each picture, a co-located reference direction flag.