Interlayer Video Decoding Using Sub-pixel Disparity Vectors
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Solution Overview
Problem
Conventional video codecs face challenges in effectively encoding and decoding high-resolution video content due to limitations in predicting images using macroblocks of predetermined sizes, which do not adequately leverage the spatial and temporal correlations within video data.
Innovation Solution
The method involves using a disparity vector with sub-pixel components for interlayer prediction between images in different layers, determining the position of an integer pixel in the reference layer corresponding to the disparity vector, and decoding the current layer using prediction information from the candidate area of the reference layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional video codecs use macroblocks of predetermined size for encoding, then the encoding process is simplified and hardware implementation is easier, but the prediction accuracy for high-resolution video content deteriorates
Solution Approach 1:
The patent divides the current block into multiple sub-blocks and performs separate prediction for each sub-block using different reference blocks from the reference layer. This segmentation allows the system to capture local variations in high-resolution video content more effectively, improving prediction accuracy while maintaining a systematic encoding approach that is implementable in hardware.
Solution Approach 2:
The patent applies different prediction strategies to different sub-blocks based on their local characteristics. By selecting reference blocks locally for each sub-block rather than using a uniform approach for the entire block, the system adapts to local variations in the video content, thereby improving overall prediction accuracy for high-resolution content.
2Device complexity
If video content is encoded using limited encoding methods based on predetermined macroblocks, then device complexity is reduced, but the ability to effectively encode high-resolution video content deteriorates
Solution Approach 1:
The patent extends the prediction process from a single layer to multiple layers by utilizing both current layer blocks and reference layer blocks. This inter-layer prediction approach adds a dimensional aspect to the encoding process, enabling more effective compression of high-resolution video content by leveraging correlations between different layers while maintaining manageable device complexity.
3Measurement precision
If sub-pixel disparity vectors are used for interlayer prediction, then prediction precision is improved, but the complexity of determining reference pixel positions increases
Solution Approach 1:
The patent performs preliminary rounding of sub-pixel disparity vector components to obtain integer pixel positions before using them to access reference blocks. This preliminary action simplifies the subsequent processing by converting fractional coordinates into discrete pixel positions that can be directly used for block extraction, thereby reducing the overall complexity of the system while maintaining sub-pixel level prediction precision.
Data Source
AI summary
Disclosed is a video decoding method including: obtaining a disparity vector having components in sub-pixel unit for interlayer prediction between images belonging to a current layer and a reference layer; determining a position of an integer pixel of the reference layer corresponding to a position indicated by the disparity vector obtained from the position of a current pixel of the current layer; and decoding the image of the current layer by using prediction information on a candidate area of the reference layer corresponding to the determined position of the integer pixel.