Residual Block Differential Decoding for Higher Video Coding Efficiency
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Solution Overview
Problem
Existing video compression technologies face challenges in achieving superior coding efficiency and higher image quality due to the increasing size, resolution, and frame rate of video data, requiring a new compression technique to improve compression performance.
Innovation Solution
A differential coding technique is applied during decoding in a transform skip mode to modify residual signals based on direction information, using a video decoding apparatus with components like an entropy decoding unit, inverse quantization unit, and an adder to reconstruct video blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing video compression technologies (H.264/AVC and HEVC) are used, then video data can be compressed and transmitted, but coding efficiency and image quality deteriorate as video image size, resolution, and frame rate increase
Solution Approach 1:
The patent divides the residual block into multiple sub-blocks and applies differential coding to each sub-block separately. This segmentation allows the encoder to capture local variations in residual signals more effectively, improving coding efficiency for high-resolution and high-frame-rate videos where local details are more critical.
Solution Approach 2:
The patent changes the coding parameters by applying differential coding operations (horizontal, vertical, or diagonal) to residual signals based on the transform skip mode. This parameter change enables better exploitation of spatial correlations in residual signals, leading to improved compression performance as video complexity increases.
2Reliability
If video data is stored or transmitted in raw form, then no compression is applied, but hardware resources (memory) and data transmission requirements increase significantly
Solution Approach 1:
The patent introduces an intermediary differential coding step that operates on residual signals before final encoding. This intermediary process reduces the energy required for compression while maintaining image quality, as it exploits local correlations in residual signals to achieve better compression ratios without aggressive lossy compression.
3Productivity
If transform skip mode is used without differential coding, then decoding is simplified, but compression performance deteriorates due to higher residual signal energy
Solution Approach 1:
The patent implements a dynamic differential coding approach where the encoder selects among horizontal, vertical, or diagonal differential operations based on the characteristics of the residual block. This dynamic adaptation improves compression performance by matching the differential direction to the local signal structure, while the decoder remains relatively simple by following encoder instructions.
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.