Intra Image Decoding With Multi-Resolution Block Prediction
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images leads to a significant increase in transmission and storage costs due to the higher amount of information required, necessitating a more efficient image compression technique.
Innovation Solution
A method and apparatus for video decoding that employs block-based adaptive multi-resolution intra prediction, involving scaling neighboring samples to derive modified reference samples and prediction samples, and upscaling reconstructed blocks to improve coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional image compression techniques are used for high-resolution images, then image quality is maintained, but transmission cost and storage cost increase due to larger data volume
Solution Approach 1:
The patent changes the resolution parameter of the current block by scaling it to match the resolution of neighboring blocks. This allows the encoder to work with uniform resolution blocks during compression, reducing the complexity and data volume required while maintaining image quality through subsequent upscaling operations.
Solution Approach 2:
The patent segments the image processing into distinct stages: scaling the current block to match neighboring block resolution, performing compression on the scaled block, and then upscaling the reconstructed block. This segmentation allows each stage to be optimized independently, improving overall compression efficiency.
2Manufacturing precision
If high-resolution image data is transmitted without compression, then image quality is preserved, but transmission cost and storage cost increase
Solution Approach 1:
The patent temporarily changes the resolution parameter of the current block to match neighboring blocks before compression. This parameter change enables more efficient compression algorithms to be applied, significantly reducing the bitrate required for transmission while maintaining the ability to reconstruct high-quality images through upscaling.
3Adaptability or versatility
If intra prediction is performed on blocks of different resolutions, then adaptability to varying block sizes is improved, but coding complexity increases
Solution Approach 1:
The patent segments the resolution adaptation process into distinct operations: scaling the current block to match neighboring block resolution before prediction, performing prediction on uniformly scaled blocks, and then upscaling the reconstructed block. This segmentation simplifies the prediction process by eliminating the need to handle different resolution cases during prediction itself.
Solution Approach 2:
The patent performs preliminary scaling of the current block to match the resolution of neighboring blocks before performing intra prediction. This preliminary action ensures that all prediction operations work with uniformly sized blocks, significantly reducing coding complexity while maintaining adaptability to different original block sizes through the subsequent upscaling step.
Data Source
AI summary
An image decoding method performed by a decoding apparatus according to the present document comprises the steps of: deriving an intra prediction mode of a current block; scaling neighboring samples for the current block so as to derive modified neighboring reference samples for the current block; deriving prediction samples for the current block on the basis of the intra prediction mode and the modified neighboring reference samples; deriving a reconstructed block for the current block on the basis of the prediction samples; and upscaling the reconstructed block so as to derive a modified reconstructed block.