Intra-Prediction Mode Selection for Lower Video Coding Overhead
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Solution Overview
Problem
High-resolution and high-quality image data requires high-efficiency encoding/decoding techniques to reduce the increased costs of transmission and storage associated with conventional methods.
Innovation Solution
An image decoding method that derives and performs intra-prediction based on intra-prediction mode, using indicators to determine mode sameness and configure Multiple Prediction Mode (MPM) lists, and an encoding method that signals intra-prediction mode efficiently through similar indicators and MPM lists.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution and high-quality image data is transmitted or stored using conventional methods, then image quality is maintained, but transmission and storage costs increase
Solution Approach 1:
The patent extracts and transmits only the essential image information by using prediction techniques to reconstruct image blocks from limited data. Instead of transmitting complete high-resolution image data, the system extracts key features and prediction modes, then reconstructs the full image at the decoder side, significantly reducing transmission and storage requirements while maintaining image quality
Solution Approach 2:
The patent inverts the conventional approach by having the decoder perform complex reconstruction operations rather than the encoder transmitting all necessary data. The encoder sends compact prediction mode information and residual data, while the decoder uses these to reconstruct high-quality images through intra-prediction and inter-prediction operations, effectively shifting computational burden from transmission to processing
2Quantity of substance
If conventional image compression techniques are used, then data transmission is reduced, but compression efficiency is insufficient for high-resolution images
Solution Approach 1:
The patent implements dynamic compression by adaptively selecting between intra-prediction and inter-prediction modes based on the characteristics of each image block. The system dynamically adjusts prediction parameters, block sizes, and compression strength according to local image features, enabling efficient compression of high-resolution images while maintaining quality. This dynamic approach allows the compressor to handle diverse image content with varying complexity
Solution Approach 2:
The patent segments high-resolution images into multiple blocks and applies different prediction and compression strategies to each block. By dividing the image into manageable units, the system can optimize compression for each segment independently, selecting appropriate prediction modes (intra or inter) and parameters for each block, thereby achieving overall high compression efficiency while preserving image quality
3Device complexity
If intra-prediction mode signaling is performed without optimization, then decoding is simplified, but compression efficiency is reduced due to increased overhead
Solution Approach 1:
The patent applies preliminary action by pre-defining and signaling a limited set of most probable intra-prediction modes (MPM list) that are most likely to be used for each block. The decoder uses this pre-configured list to quickly determine the actual prediction mode without extensive searching or complex calculations. This preliminary preparation of mode candidates significantly reduces decoding complexity while maintaining compression efficiency through optimized mode selection
Data Source
AI summary
An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus according to the present invention may comprise deriving an intra-prediction mode of a current block, and performing intra-prediction for the current block based on the intra-prediction mode. The deriving of the intra-prediction mode may comprise decoding a predetermined mode sameness indicator.