Image Block Decoding With Bidirectional Motion Vector Search
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The rapid increase in multimedia data demand outpaces the development of channel bandwidth, necessitating improved video compression methods, particularly in predicting current blocks using multiple prediction information and enhancing motion information accuracy for efficient encoding and decoding.
Innovation Solution
An image decoding method that generates a first and second prediction block through inter and intra prediction, respectively, and combines them via weighted-summing, utilizing motion vectors in past and future directions, and a search region with predefined size to refine motion vector determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple prediction blocks are generated and combined using weighted-summing to improve prediction accuracy, then the prediction precision is improved, but the computational complexity and device complexity increase
Solution Approach 1:
The patent combines multiple prediction blocks (inter prediction block and intra prediction block) using weighted-summing to create a final prediction block. This merging of multiple prediction sources improves prediction accuracy by leveraging both temporal and spatial information, resolving the contradiction between prediction precision and computational complexity through a structured combination approach.
2Measurement precision
If motion vector search is performed in a predefined search region to improve motion information accuracy, then the measurement precision is improved, but the processing time and loss of time increase
Solution Approach 1:
The patent performs motion vector search within a predefined search region before final prediction block generation. This preliminary action constrains the search space to a predetermined area, improving motion information accuracy while limiting the time loss by avoiding exhaustive search across the entire reference frame.
3Adaptability or versatility
If inter prediction and intra prediction are both used to generate prediction blocks, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The patent implements a universal prediction framework that can perform both inter prediction (using temporal information from reference frames) and intra prediction (using spatial information from neighboring blocks). This multi-functional approach improves adaptability to different video content characteristics while managing encoding complexity through a unified weighted-summing combination mechanism.
Data Source
AI summary
Disclosed herein are an image encoding method and an image decoding method. The image decoding method includes determining an initial motion vector of a current block using a motion vector of a reconstructed region, searching for the motion vector of the current block based on the initial motion vector, and generating a prediction sample of the current block using the motion vector. The initial motion vector includes a motion vector in a past direction and a motion vector in a future direction.