Lossless Coding Mode for Video Data Integrity
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Solution Overview
Problem
Current video coding technologies face challenges in efficiently reducing redundancy in video data, particularly in representing less likely intra prediction directions and motion vectors, which affects compression efficiency and bitrate reduction.
Innovation Solution
The implementation of a lossless coding mode in video encoding and decoding systems, which includes various coding modes such as joint chroma residual coding, luma mapping with chroma scaling, and transform skip modes, allows for the bypass of transform and quantization processes, enabling more efficient representation of video data by disabling lossy coding modes and using specific residual coding schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional intra coding without intra prediction is used, then device complexity is reduced, but compression efficiency deteriorates due to inability to represent less likely intra prediction directions efficiently
Solution Approach 1:
The patent introduces a lossless coding mode that changes the coding parameters by bypassing transform and quantization processes. This allows for precise representation of intra prediction residuals without loss, enabling efficient coding of less likely intra prediction directions while maintaining manageable device complexity through selective application of the mode
Solution Approach 2:
The patent implements dynamic mode selection where the encoder can switch between traditional intra coding and lossless coding mode based on the specific block characteristics and prediction direction likelihood. This dynamic adaptation optimizes compression efficiency for different content types while controlling overall device complexity
2Quantity of substance
If lossy compression is used to reduce bitrate, then bandwidth requirements are reduced, but video quality deteriorates due to distortion in reconstructed signal
Solution Approach 1:
The lossless coding mode changes the compression parameters by disabling transform and quantization, which are the primary sources of lossy distortion. This allows achieving lower bitrates through more efficient residual coding while maintaining exact reconstruction of the original video data, thus preserving video quality
Solution Approach 2:
The patent extracts and removes the lossy components (transform and quantization) from the coding pipeline when lossless mode is activated. This selective removal of lossy processing stages enables bitrate reduction through better entropy coding while preserving video quality through lossless reconstruction
3Quantity of substance
If transform and quantization processes are applied, then compression ratio is improved, but manufacturing precision deteriorates due to loss of information in residual data
Solution Approach 1:
The patent introduces a parameter (lossless mode flag) that controls whether transform and quantization are applied. When activated, this parameter change bypasses the lossy processes entirely, maintaining exact data integrity while achieving compression through efficient residual coding and entropy coding schemes
Solution Approach 2:
The system dynamically adjusts the coding process by selectively applying or bypassing transform and quantization based on content characteristics and desired quality levels. This dynamic control allows optimizing the balance between compression ratio and data integrity for different video blocks
Data Source
AI summary
An apparatus of video decoding can include circuitry configured to receive a lossless mode flag associated with a current block indicating whether a lossless coding mode is applied to the current block, determine that a lossy coding mode is not applied to the current block when the lossless mode flag indicates that the lossless coding mode is applied to the current block, and reconstruct the current block with the lossy coding mode disabled.