Intra Block Decoding With Directional Residual Differential Coding
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Solution Overview
Problem
Existing video compression technologies struggle with high data volume and require improved coding efficiency and image quality, especially with increasing video sizes, resolutions, and frame rates.
Innovation Solution
A differential coding technique is applied during decoding in a transform skip mode to modify residual signals based on direction information, using intra prediction to enhance compression performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing video compression technologies (H.264/AVC, HEVC) are used, then video data can be compressed, but coding efficiency and image quality are insufficient due to increasing video image sizes, resolutions, and frame rates
Solution Approach 1:
The residual block is divided into multiple sub-blocks, and differential coding is applied to each sub-block independently. This segmentation allows for more precise local compression, improving overall coding efficiency while handling increasing video data amounts effectively
Solution Approach 2:
The patent applies differential coding to modify residual signals by adding prediction values based on neighboring block differences. This parameter transformation reduces the energy of residual components, improving compression performance without sacrificing image quality
2Reliability
If video data is stored or transmitted in raw form, then no compression is applied, but hardware resources including memory are excessively consumed
Solution Approach 1:
Differential coding transforms residual signals by incorporating spatial prediction information, reducing the magnitude of residual components. This parameter change enables more efficient compression while maintaining reconstruction accuracy, reducing memory requirements without compromising image quality
3Quantity of substance
If compression ratio is increased to reduce data amount, then storage and transmission efficiency improve, but coding efficiency and image quality deteriorate
Solution Approach 1:
By segmenting the residual block into sub-blocks and applying differential coding locally, the patent achieves better energy compaction and prediction accuracy. This segmentation enables higher compression ratios while maintaining or improving coding efficiency compared to conventional methods
Solution Approach 2:
The patent introduces an intermediate differential coding step that processes residual signals before entropy encoding. This intermediary transformation reduces residual energy and improves the effectiveness of subsequent compression stages, achieving better overall compression performance
Data Source
AI summary
A video decoding method is configured to reconstruct a current block that is encoded using an intra prediction. The method includes decoding, from a bitstream, direction information indicating a direction of differential coding applied to a residual block of the current block, generating the residual block from residual signals by reconstructing and using the information on the residual signals from the bitstream and using the direction information, inversely quantizing the modified residual block, generating a prediction block for the current block through intra prediction, and reconstructing the current block by adding the prediction block and the inverse quantized residual block.