Intra Block Copy Candidate List Derivation for Image Compression
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Solution Overview
Problem
High-resolution and high-quality image data requires more storage and transmission resources due to increased data volume, necessitating improved image encoding/decoding techniques to enhance compression efficiency.
Innovation Solution
The method determines a prediction mode for a current block as IBC mode, derives a candidate list for block vector derivation based on block size, and uses spatial and HMVP candidates to optimize block vector prediction, ensuring efficient encoding and decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-resolution and high-quality image data is used, then image quality is improved, but data volume increases leading to higher storage and transmission costs
Solution Approach 1:
The patent applies Intra Block Copy (IBC) mode which copies block data from within the same image to predict current block values. This allows high-quality image representation with reduced data volume by reusing existing block patterns, thereby resolving the contradiction between image quality and data volume.
Solution Approach 2:
The patent introduces a candidate list mechanism that dynamically selects prediction parameters based on block size. For larger blocks, spatial candidates are added to the candidate list, allowing the system to adapt prediction methods to block dimensions and optimize compression efficiency for high-resolution images.
2Loss of energy
If conventional image compression techniques are used, then compression is achieved, but compression efficiency is insufficient for high-resolution images
Solution Approach 1:
The patent implements a dynamic candidate list derivation process where the list composition changes based on block size. The system adaptively adds spatial candidates for larger blocks, allowing the compression algorithm to optimize its prediction capabilities dynamically according to the specific block characteristics being processed.
Solution Approach 2:
The patent uses HMVP (History Based Motion Vector Prediction) mode which incorporates historical prediction information into the current block prediction. This feedback mechanism leverages previously successful predictions to improve current compression efficiency, particularly for high-resolution images with repetitive patterns.
Data Source
AI summary
An image decoding method is disclosed in the present specification. An image decoding method according to the present invention may include: determining a prediction mode of a current block as IBC (Intra Block Copy) mode, deriving a candidate list for deriving a block vector of the current block and deriving a block vector of the current block by using the candidate list, wherein the candidate list is derived based on a size of the current block.