Intra Prediction Mode Encoding Using Most Probable Mode List
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Solution Overview
Problem
The increasing demand for compressing next-generation media such as 4K/8K UHD videos and VR images requires more efficient video encoding and decoding methods, particularly in representing intra prediction modes, as the number of intra prediction modes increases, leading to a higher amount of required information.
Innovation Solution
Determining candidate intra prediction modes with high probability using prediction mode information from adjacent blocks and encoding/decoding these modes to reduce the bit amount required for representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of intra prediction modes is increased to improve prediction accuracy, then the prediction quality is improved, but the amount of information required to represent the intra prediction modes increases
Solution Approach 1:
The patent applies local quality by differentiating the treatment of prediction modes based on their probability of occurrence. High-probability modes (most probable modes) are encoded with fewer bits using a specialized MPM index, while lower-probability modes use standard encoding. This non-uniform encoding strategy optimizes the bit representation based on the local probability characteristics of different prediction modes.
Solution Approach 2:
The patent changes the encoding parameter (number of bits) based on the probability parameter of the prediction mode. By identifying modes with probability above a threshold and assigning them a compressed representation (MPM index with fewer bits), the system dynamically adjusts the information representation parameters to reduce overall bit consumption while maintaining prediction accuracy.
2Measurement precision
If the number of intra prediction modes is increased to improve prediction accuracy, then the prediction quality is improved, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-identifying and storing the most probable modes (MPMs) in a dedicated list before the actual encoding process. By determining the MPM list in advance based on adjacent block information and maintaining this list for reference, the system prepares the high-probability modes ahead of time, reducing the computational complexity during the actual mode selection and encoding process.
3Loss of information
If candidate intra prediction modes are determined using adjacent block information, then the bit amount is decreased, but the processing time increases
Solution Approach 1:
The patent applies preliminary action by determining the most probable modes (MPMs) in advance using adjacent block information before the actual encoding decision is made. The MPM list is prepared beforehand based on spatial and temporal correlations with neighboring blocks, so that when encoding is needed, the high-probability modes are already identified and ready for efficient encoding, reducing both bit consumption and processing time.
Data Source
AI summary
Provided are a video decoding method and apparatus and a video encoding method and apparatus which determine whether to use a Most Probable Mode (MPM) list, based on encoding information of a current block, obtain, from a bitstream, intra prediction mode index information indicating one of candidate intra prediction modes included in the MPM list, and determine an intra prediction mode of the current block by using the obtained intra prediction mode index information.