Intra Prediction MPM List Using MRL Index for Video Compression
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Solution Overview
Problem
The increasing demand for high-resolution, high-quality images and videos, particularly in virtual reality and augmented reality, necessitates a more efficient image/video compression technique to reduce transmission and storage costs.
Innovation Solution
An intra prediction method based on a Most Probable Mode (MPM) list using multi-reference line (MRL) index information and planar flag information to determine the intra prediction mode for current blocks, with context index increments based on Intra Sub Partition (ISP) mode application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high resolution and high quality image/video are used, then image quality is improved, but transmission and storage costs increase
Solution Approach 1:
The patent extracts and transmits only the essential information needed for intra prediction mode selection. By using an MPM list that contains only the most probable modes and transmitting a compact index rather than full mode information, the patent reduces the bitstream overhead while maintaining high prediction accuracy, thus enabling high quality compression at lower transmission costs
Solution Approach 2:
The patent changes the parameter representation by introducing an MPM index that references a pre-defined list of most probable modes. Instead of transmitting complete mode information or using traditional prediction methods, the system uses compact index values (e.g., 2 bits for 4 modes) to represent prediction modes, significantly reducing the information overhead while preserving image quality
2Measurement precision
If intra prediction mode information is transmitted in detail, then prediction accuracy is improved, but bitstream overhead increases
Solution Approach 1:
The patent applies partial action by transmitting only the necessary portion of prediction mode information. Instead of sending complete mode data or using exhaustive prediction methods, the system transmits a compact MPM index that references a pre-defined list of most probable modes. This partial information transmission achieves sufficient prediction accuracy while minimizing bitstream overhead
Solution Approach 2:
The patent performs preliminary action by pre-defining the MPM list of most probable modes at the encoder side before transmission. This pre-computation allows the decoder to reconstruct the same MPM list and accurately interpret the transmitted index values without needing to receive or compute the full mode information, thereby reducing bitstream overhead while maintaining prediction accuracy
Data Source
AI summary
An image decoding method performed by a decoding apparatus according to the present disclosure comprises the steps of: obtaining intra prediction information including at least one of MPM flag information, MRL index information, and planner flag information from a bitstream; checking the MPM flag information; checking the MRL index information on the basis of a case where the MPM flag information indicates that the MRL index information is checked; checking the planner flag information on the basis of a case where a value of the MRL index information is 0; deriving an intra prediction mode for a current block on the basis of the check for the planner flag information; deriving prediction samples for the current block on the basis of the intra prediction mode for the current block; and generating a reconstructed picture on the basis of the prediction samples.