Intra Merge Skip Mode for Null-Residual Video Block Prediction
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Solution Overview
Problem
Existing video compression technologies face challenges in efficiently leveraging intra prediction modes, particularly in scenarios where residual prediction is null, leading to suboptimal compression efficiency.
Innovation Solution
Implementing an intra merge skip mode that determines whether residual prediction is null and selects an intra mode from a list of candidates, excluding the Intra Block Copy mode, to encode or decode video blocks more efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional intra prediction modes are used for all blocks, then prediction accuracy is maintained, but compression efficiency deteriorates due to unnecessary encoding of residual prediction
Solution Approach 1:
The patent introduces a new parameter (intra merge skip mode flag) that changes the encoding state from conventional residual-based prediction to skip-mode prediction. When this flag is set, the encoder switches to a different prediction approach that does not require residual encoding, thereby improving compression efficiency while maintaining acceptable prediction accuracy for suitable blocks
2Loss of energy
If intra merge skip mode is applied to all intra modes, then compression efficiency improves, but reliability deteriorates due to potential loss of prediction accuracy for certain modes
Solution Approach 1:
The patent applies the intra merge skip mode selectively rather than universally. Different intra modes are evaluated individually to determine whether they benefit from skip-mode encoding. This localized application ensures that only modes suitable for skip encoding (where residual is likely null) use this mode, while other modes continue with conventional encoding, thus maintaining overall prediction reliability
Solution Approach 2:
The patent introduces dynamic selection of encoding modes based on block characteristics. The encoder evaluates each block to determine whether intra merge skip mode is appropriate, rather than using a fixed encoding approach. This dynamic adaptation allows the system to optimize between compression efficiency and prediction reliability on a per-block basis
3Manufacturing precision
If residual prediction is always encoded, then prediction accuracy is maintained, but device complexity increases due to additional encoding steps
Solution Approach 1:
The patent extracts the residual encoding step from the conventional intra prediction process for blocks where it is unnecessary. By identifying blocks where the residual is likely null and applying intra merge skip mode, the patent removes the redundant residual encoding operations, thereby reducing encoding complexity without significantly impacting prediction accuracy for those specific blocks
Data Source
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Figure 1C
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AI summary
A method and an apparatus for encoding or decoding an image or a video are provided wherein it is determined, for a block of a video, whether or not an intra merge skip mode is used for the block, the intra merge skip mode indicating that residual prediction of the block is inferred to be null and an intra mode for predicting the block is selected in a list of intra mode candidates. The list of intra mode candidates is obtained based on a set of intra modes for which the intra merge skip mode is enabled, the set of intra modes comprising at least one intra mode distinct from an Intra Block Copy mode. If the intra merge skip mode is used for the block, the block is encoded or reconstructed using a selected intra mode candidate in the list of intra mode candidates.