Intra Linear Interpolation Prediction Video Decoding
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Solution Overview
Problem
Current video processing technologies face challenges in efficiently encoding and decoding complex images while maintaining encoding performance and coding efficiency, particularly in intra prediction modes, especially with the increasing demand for high-definition video signals.
Innovation Solution
A method and apparatus for decoding a video signal that involves obtaining flag information to determine if intra linear interpolation prediction is performed on a current block, constructing a candidate mode list based on neighboring block modes, and generating predictors using intra Linear Interpolation Prediction (LIP) to improve prediction performance without degrading encoding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If intra linear interpolation prediction is used for current blocks, then prediction performance is improved, but device complexity increases due to additional flag parsing and candidate mode list construction
Solution Approach 1:
The patent applies preliminary action by pre-defining candidate mode lists based on neighboring block prediction modes before the actual prediction process. The decoder prepares multiple candidate modes (including both conventional and LIP modes) in advance, allowing the selector to choose the optimal mode without complex real-time calculations, thus improving prediction performance while controlling decoding complexity.
2Adaptability or versatility
If various coding structures are provided for linear interpolation intra prediction, then encoding/decoding of complicated images is enhanced, but device complexity increases
Solution Approach 1:
The patent segments the prediction mode selection process into distinct components: candidate mode list construction, flag-based mode indication, and predictor generation. By dividing the complex prediction process into manageable segments with clear decision points (flags), the system achieves versatile coding structures for different image types while keeping the complexity of each segment controlled and manageable.
3Productivity
If intra prediction mode is derived from neighboring blocks, then coding efficiency is improved, but loss of information occurs when flag information is not properly parsed
Solution Approach 1:
The patent implements feedback mechanisms through flag information (e.g., prev_intra_luma_pred_flag, lip_flag) that provide explicit signals about whether prediction modes are derived from neighboring blocks and whether LIP should be applied. This feedback ensures that the decoder accurately reconstructs the prediction mode information without loss, maintaining coding efficiency while preventing information loss through proper flag parsing and candidate mode list construction.
Data Source
AI summary
The present invention relates to a method for decoding a bitstream for a video signal, and a device therefor, and relates to a device and a method in which, according to whether or not intra linear interpolation prediction is performed for the current block, a candidate mode list is formed on the basis of the intra prediction mode of the neighboring block of the current block, a candidate mode is determined, and, on the basis of same, intra LIP is carried out, thereby generating a prediction value for the current block.