Video Encoder HMVP Updates for Small-Block Processing Efficiency
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Solution Overview
Problem
Existing video coding technologies face challenges in efficiently processing increasing amounts of digital video data, particularly in terms of encoding and decoding efficiency and speed, with a need for improvements in video encoding and decoding systems.
Innovation Solution
An encoder and decoder system that updates a history-based motion vector predictor (HMVP) table using a first in first out (FIFO) method, determining whether the current block size is less than a threshold size to skip or perform updates, and generates a candidate motion vector prediction list without using the HMVP table for smaller blocks, thereby reducing processing amount and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the HMVP table is updated for every block using FIFO method, then the prediction accuracy is improved, but the processing amount and time increase
Solution Approach 1:
The patent changes the parameter of block size threshold to determine whether to update the HMVP table. By comparing current block size against a predefined threshold, the system dynamically adjusts the updating behavior, skipping updates for small blocks while maintaining them for larger blocks, thus resolving the contradiction between prediction accuracy and processing speed
2Measurement precision
If the HMVP table is updated for every block, then the motion vector prediction quality is improved, but the encoding complexity increases
Solution Approach 1:
The patent applies local quality by treating different block sizes differently in the HMVP table updating process. Instead of applying a uniform updating rule to all blocks, the system applies selective updating based on block size classification, thereby reducing unnecessary processing for small blocks while maintaining quality for larger blocks where it matters more
3Productivity
If the HMVP table is used for all block sizes, then the encoding efficiency is improved, but the processing overhead for small blocks increases unnecessarily
Solution Approach 1:
The patent applies partial action by performing HMVP table updating only for blocks that exceed a certain size threshold. For small blocks, the system partially skips the updating process, recognizing that the benefit of updated motion vector prediction is minimal for small blocks, thus reducing processing overhead without significantly compromising encoding efficiency
Data Source
AI summary
Provided is an encoder includes: circuitry; and memory coupled to the circuitry, in which in operation, the circuitry: generates a prediction image of a current block to be processed, using a first motion vector; and updates a history based motion vector predictor (HMVP) table using a first candidate having the first motion vector, the HMVP table storing, in a first in first out (FIFO) method, a plurality of second candidates each having a second motion vector used for a processed block, and in the updating of the HMVP table, the circuitry: determines whether a size of the current block is less than or equal to a threshold size; and skips the updating of the HMVP table when the size of the current block is determined to be less than or equal to the threshold size.