Video Encoder Transform Selection Based on Block Size and Prediction Mode
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Solution Overview
Problem
Current video coding technologies face challenges in efficiently reducing redundancy in video signals through compression, particularly in inter-picture prediction modes, which affects bandwidth and storage requirements.
Innovation Solution
A modified implicit transform method and an implicit transform selection method for inter position-dependent prediction combination (PDPC) prediction mode are introduced, where the primary transform type is determined based on block size and neighboring block coding modes, applying discrete sine transforms (DST) or discrete cosine transforms (DCT) to optimize prediction accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional video coding techniques are used for inter-picture prediction, then bandwidth and storage requirements are high, but compression efficiency is insufficient
Solution Approach 1:
The patent applies different primary transform types (DST-7, DCT-2, transform skip) based on block size and prediction mode parameters. By dynamically selecting transform parameters according to specific conditions (e.g., using DST-7 for small blocks in certain prediction modes), the coding efficiency is improved while reducing bitrate requirements
Solution Approach 2:
The patent applies different transform types to different regions (blocks) based on their local characteristics such as block size and prediction mode. This localized approach allows optimal transform selection for each block, improving overall compression efficiency without uniformly increasing complexity across the entire video stream
2Productivity
If transform types are fixed for all blocks, then processing is simple, but coding efficiency is reduced
Solution Approach 1:
The patent introduces dynamic transform selection where the primary transform type is determined based on block size and prediction mode. This dynamic adaptation allows the system to optimize coding efficiency for different block characteristics while maintaining a limited set of transform options, balancing complexity and performance
3Measurement precision
If filtering is applied to all blocks, then prediction accuracy improves, but computational complexity increases
Solution Approach 1:
The patent applies filtering operations selectively to specific blocks based on their characteristics (block size, prediction mode) rather than uniformly to all blocks. This partial application of filtering maintains prediction accuracy for blocks that benefit from it while reducing unnecessary computational complexity for blocks where filtering provides minimal gain
Data Source
AI summary
A method of video encoding for an encoder includes generating first information included in prediction information for a current block, the first information indicating whether a filtering process is applied on the current block. The filtering process adjusts inter prediction samples of the current block based on neighboring reconstructed samples of the current block. The method further includes generating second information included in the prediction for the current block, the second information corresponding to a primary transform for a transform block that is partitioned from the current block. The method further includes generating a bitstream including the prediction information for the current block, the prediction information including the first information and the second information, the prediction information being indicative of the inter prediction mode.