Intra Prediction MPM List for Image Coding Efficiency
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Solution Overview
Problem
The increasing demand for high resolution and high quality images/videos, such as 4K and 8K Ultra High Definition, poses a challenge in efficiently compressing, transmitting, and storing these files due to the higher amount of information required, leading to increased costs and resource utilization.
Innovation Solution
The proposed solution involves an image coding method and apparatus that enhance image coding efficiency by utilizing an intra prediction method based on a Most Probable Mode (MPM) list. This includes deriving the intra prediction mode for a current block based on MPM flag information and planar flag information, and configuring an MPM list for efficient coding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high resolution and high quality image/video data are transmitted or stored using conventional methods, then image quality is maintained, but transmission and storage costs increase significantly
Solution Approach 1:
The patent extracts and transmits only the essential information needed to represent the image block by using intra-prediction techniques. Instead of transmitting all pixel data, the system transmits prediction mode information and residual data, significantly reducing the amount of data that needs to be transmitted while maintaining image quality.
Solution Approach 2:
The patent inverts the conventional approach by having the decoder generate prediction blocks based on reference blocks and prediction modes, then adding residual data to reconstruct the original image. This inversion of the encoding/decoding process allows for efficient compression while maintaining high image quality.
2Loss of information
If conventional image coding methods are used for high resolution images, then complete image data is transmitted, but the amount of information and bits transmitted increases
Solution Approach 1:
The patent creates prediction blocks that copy the essential characteristics of the original image blocks by using reference blocks from already decoded areas. These prediction blocks serve as approximations that require far fewer bits to transmit than the original high-resolution image data.
Solution Approach 2:
The patent divides the image into blocks and processes each block independently using intra-prediction. By segmenting the image into manageable blocks and applying prediction techniques to each block, the system reduces the overall data volume while maintaining complete image information through the combination of prediction modes and residual data.
3Productivity
If intra prediction based on MPM list is used for current block, then coding efficiency is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary actions by pre-defining a Most Probable Mode (MPM) list containing the most likely prediction modes for a given block based on neighboring block modes. This preliminary organization of prediction modes allows the decoder to quickly select from a limited set of candidates, improving coding efficiency while managing device complexity through structured preprocessing.
Solution Approach 2:
The patent changes the parameter of prediction mode selection by using an indexed approach where the MPM list is constructed based on neighboring block prediction modes. This parameter change from exhaustive mode search to indexed MPM-based selection significantly improves coding efficiency while the systematic construction of the MPM list keeps device complexity manageable.
Data Source
AI summary
A method for decoding an image performed by a decoding apparatus according to the present disclosure comprises the steps of: receiving intra prediction information including at least one of MPM flag information indicating whether to derive an intra prediction mode for a current block on the basis of MPM candidates for the current block, or PLANAR flag information indicating whether to determine the intra prediction mode for the current block as a PLANAR mode; deriving the intra prediction mode for the current block on the basis of the MPM flag information and the PLANAR flag information; deriving a predicted block 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 predicted block.