Image Decoding Device Asymmetric Partition Motion Compensation
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Solution Overview
Problem
In inter prediction, the addition of asymmetric partitions increases coding side information and does not fully exploit their characteristics, leading to inefficient encoding and decoding processes.
Innovation Solution
An image decoding and encoding device that uses a uni-prediction or bi-prediction scheme, with a motion compensation parameter derivation unit that switches between these schemes based on the size of the prediction unit, and an arithmetic decoding unit that decodes binary values using contexts or without contexts depending on the partition type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If asymmetric partitions are added to inter prediction, then prediction accuracy is improved, but coding side information increases
Solution Approach 1:
The patent changes the parameter of partition symmetry by introducing asymmetric partitions (where width and height divisions are unequal) in addition to traditional symmetric partitions. This allows more flexible adaptation to motion patterns in video content, improving prediction accuracy while managing side information through selective application based on block characteristics
2Adaptability or versatility
If asymmetric partitions are used, then prediction flexibility is improved, but encoding complexity increases
Solution Approach 1:
The patent implements dynamic selection between symmetric and asymmetric partition modes based on the characteristics of the current block and reference frames. The encoder adaptively chooses the most appropriate partition type for each coding unit, allowing flexibility to exploit asymmetric motion patterns when present while avoiding unnecessary complexity when symmetric partitions suffice
3Measurement precision
If asymmetric partitions are implemented, then motion representation accuracy is improved, but decoding complexity increases
Solution Approach 1:
The patent performs preliminary classification and signaling of asymmetric partition modes during encoding, where the partition type information is explicitly coded and transmitted in the bitstream. This allows the decoder to efficiently identify and process asymmetric partitions without requiring complex analysis, as the partition structure information is provided in advance through the encoded data
Data Source
AI summary
To achieve a reduction in the amount of coding taken in the use of an asymmetric partition and to implement efficient encoding/decoding processes exploiting the characteristics of the asymmetric partition. An image decoding device includes a motion compensation parameter derivation unit configured to derive a motion compensation parameter indicating either a uni-prediction scheme or a bi-prediction scheme. In a case that a prediction unit has a size less than or equal to a predetermined value, the motion compensation parameter derivation unit is configured to derive the motion compensation parameter by switching between the prediction schemes.