Shape-Adaptive Intra Prediction for Video Compression Efficiency
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Solution Overview
Problem
High-resolution and high-quality images result in increased data volumes, leading to higher costs for transmission and storage, necessitating improved image encoding/decoding techniques for enhanced compression efficiency.
Innovation Solution
The method involves intra prediction based on the shape of the current block, determining reference samples, and calculating DC values and reference samples using interpolation and statistical methods for non-square blocks, with specific handling for different regions within and outside a predetermined offset distance from the block sides.
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 due to increasing data volumes
Solution Approach 1:
The patent applies parameter changes by modifying the intra prediction process based on block shape characteristics. Different prediction modes and reference sample selection strategies are applied depending on whether the block is square or non-square, optimizing compression efficiency for each case while maintaining image quality
Solution Approach 2:
The patent implements local quality by applying different prediction modes to different regions within a block. Specifically, when a block is divided into sub-blocks, different intra prediction modes can be applied to different sub-blocks, allowing localized optimization of compression while preserving important image features in different regions
2Productivity
If conventional intra prediction is used for all blocks, then processing is simple, but compression efficiency is reduced for non-square blocks
Solution Approach 1:
The patent applies dynamics by making the intra prediction process adaptive to block characteristics. The prediction mode selection and reference sample determination dynamically adjust based on whether the current block is square or non-square, and on the specific shape parameters of the block, thereby optimizing compression efficiency for each case
Solution Approach 2:
The patent implements segmentation by dividing non-square blocks into multiple sub-blocks and applying different prediction modes to different sub-blocks. This allows the complex prediction process to be broken down into manageable segments, each optimized for its specific characteristics, balancing complexity and efficiency
Data Source
AI summary
The present invention relates to an image encoding/decoding method and apparatus. The image decoding method according to the present invention may comprise reconstructing an intra prediction mode of a current block, determining a reference sample for intra prediction of the current block, and generating a prediction block of the current block by performing the intra prediction on the current block on the basis of the intra prediction mode and the reference sample. The determining of the reference sample or the intra prediction may be performed on the basis of a shape of the current block.