Image Encoding With Motion Reference Block Selection for Lower Code Overhead
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Solution Overview
Problem
Existing image encoding methods, such as H.264, face challenges in efficiently encoding motion vectors due to high code amounts related to motion information and reference frame numbers, particularly when multiple reference frames are used, and methods like direct mode limit the freedom of motion vector calculation.
Innovation Solution
The proposed method selects a motion reference block from already-encoded pixel blocks, identifies an available block with different motion information, and encodes selection information using a code table, reducing the amount of data required for motion vector transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If motion compensation is performed using multiple reference frames, then prediction accuracy is improved, but code amount related to motion information increases
Solution Approach 1:
The patent extracts only the necessary motion information from multiple reference frames by selecting one reference frame and deriving motion vectors relative to it, rather than encoding motion information for all reference frames independently. This reduces the code amount while maintaining prediction accuracy through selective information extraction.
Solution Approach 2:
The patent combines motion vector information from multiple reference frames by deriving a motion vector relative to a selected reference frame, effectively merging the predictive power of multiple frames into a single compact representation that reduces overall code amount.
2Quantity of substance
If direct mode is used to derive motion vector from median of adjacent blocks, then code amount is reduced, but degree of freedom of motion vector calculation is limited
Solution Approach 1:
The patent introduces dynamic selection of reference frames and motion vector derivation methods, allowing the system to adapt between direct mode and other modes based on content characteristics. This provides flexibility and degree of freedom in motion vector calculation while maintaining efficient code usage through adaptive decision-making.
3Adaptability or versatility
If selection information identifying the selected block is always transmitted, then degree of freedom of motion vector calculation is enhanced, but code amount related to selection information increases
Solution Approach 1:
The patent enables the decoder to self-determine the selected reference frame and motion vector derivation method based on pre-agreed rules and content characteristics, eliminating the need to transmit explicit selection information. This maintains degree of freedom in motion vector calculation while avoiding additional code overhead through implicit selection mechanisms.
Data Source
AI summary
According to one embodiment, an image encoding method includes selecting a motion reference block from an already-encoded pixel block. The method includes selecting an available block including different motion information from the motion reference block, and selecting a selection block from the available block. The method includes generating a predicted image of the encoding target block using motion information of the selection block. The method includes encoding a prediction error between the predicted image and an original image. The method includes encoding selection information identifying the selection block by referring to a code table decided according to a number of the available block.