Intra Block Copy Prediction Encoder BV Estimation
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Solution Overview
Problem
The existing HEVC standard and its reference software face challenges in effectively making encoder-side decisions for intra block copy (BC) prediction mode, particularly in block vector (BV) estimation and block splitting.
Innovation Solution
The innovations involve concurrently performing BV estimation and making block splitting decisions for a block, as well as selectively merging blocks into a larger block during BV estimation, to improve encoder-side operations for intra BC prediction mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate BV estimation and block splitting decisions are made, then the encoder can process each step independently, but the overall encoding efficiency and rate-distortion performance deteriorate
Solution Approach 1:
The patent merges the block vector estimation process with the block splitting decision process into a single concurrent operation. The encoder simultaneously determines both the BV and the block split configuration, allowing these two previously separate steps to be performed in parallel, thereby improving encoding efficiency and rate-distortion performance while reducing overall processing time
2Reliability
If blocks are processed individually without merging, then the encoder structure remains simple, but the rate-distortion performance and coding efficiency deteriorate
Solution Approach 1:
The patent combines multiple blocks into a larger unified block structure during the encoding process, allowing the encoder to process and represent blocks more efficiently. This merging approach improves rate-distortion performance by reducing the number of separate encoding operations while maintaining or improving compression efficiency
Solution Approach 2:
The patent implements selective block merging where the encoder can divide the image into different block sizes based on content characteristics. By allowing flexible segmentation and merging of blocks, the system achieves optimal rate-distortion performance for various image types while managing encoder complexity through adaptive rather than fixed block handling
Data Source
AI summary
Innovations in encoder-side options for intra block copy (“BC”) prediction mode facilitate intra BC prediction that is more effective in terms of rate-distortion performance and/or computational efficiency of encoding. For example, some of the innovations relate to concurrently performing block vector (“BV”) estimation and making block splitting decisions for a block. Other innovations relate to selectively merging blocks into a larger block during BV estimation.