History-Based Block Vector Prediction for Intra Block Copy Video Coding
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Solution Overview
Problem
Current video coding techniques face challenges in reducing redundancy and bandwidth requirements for high-resolution video, particularly in intra picture block compensation, where efficient prediction methods are needed to minimize data transmission and storage needs.
Innovation Solution
The implementation of a history-based block vector prediction (HBVP) method for intra block copy (IBC) mode, which uses a table to store block vectors and locations of previously decoded blocks to construct candidate lists for predicting block vectors, allowing for efficient reconstruction and encoding of current blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If motion compensation with spatially shifted reference blocks is used, then video compression is achieved, but bandwidth and storage requirements remain high for high-resolution video
Solution Approach 1:
The patent maintains a history-based block vector prediction table that stores block vectors and locations of previously decoded blocks in advance. This preliminary storage of prediction data enables efficient retrieval during intra block copy mode, reducing the need to transmit redundant block information while maintaining high video quality through accurate prediction.
2Measurement precision
If more block vector data is stored and transmitted for accurate prediction, then prediction accuracy improves, but data transmission and storage requirements increase
Solution Approach 1:
The patent extracts only the essential block vector data and location information from previously decoded blocks and stores them in a dedicated history-based prediction table. By selecting and storing only the critical prediction parameters rather than complete block data, the system achieves high prediction accuracy while minimizing storage and transmission requirements.
3Productivity
If a history-based block vector prediction table is implemented, then intra block copy efficiency improves, but device complexity increases
Solution Approach 1:
The history-based block vector prediction table is integrated within the existing video decoding apparatus structure, nesting the prediction functionality within the standard decoding pipeline. This nested implementation allows the system to achieve improved encoding efficiency through history-based prediction without requiring a completely separate or complex external system.
Data Source
AI summary
An apparatus for video decoding includes processing circuitry. The processing circuitry can be configured to receive data of a current block coded with an intra block copy (IBC) mode in a bitstream. A block vector of the current block can be determined based on a history-based block vector prediction (HBVP) table that includes one or more entries each corresponding to a previously decoded block. Each entry can include a block vector of the corresponding previously decoded block and a location of the corresponding previously decoded block. The current block can be reconstructed based on the determined block vector of the current block.