Adaptive Color Space Switching for Mixed-Content Video Coding
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Solution Overview
Problem
Existing video codec systems lack flexibility in handling different color spaces within a single video sequence, leading to inefficiencies in encoding and decoding processes, particularly for mixed content like screen capture and natural video.
Innovation Solution
Implement adaptive color space transformation (ACT) mechanisms that conditionally signal and parse syntax elements for color space changes, adjust quantization, and account for different bit depths during encoding and decoding, using lossless operations when switching color spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a video codec system uses a fixed color space for the entire video sequence, then the encoding and decoding processes are simpler and more consistent, but the system lacks flexibility to handle mixed content with different color spaces efficiently
Solution Approach 1:
The patent implements dynamic color space switching within a video sequence by introducing syntax elements that indicate color space changes at different granularity levels (picture, slice, or block level). The encoder can adaptively select the color space for different regions or time periods, while the decoder dynamically adjusts its processing based on the signaled color space information, resolving the contradiction between adaptability and complexity
Solution Approach 2:
The patent segments the video sequence into different color space regions or time periods using syntax elements that define color space boundaries. This allows different portions of the video to be encoded in their optimal color spaces independently, providing flexibility without requiring the entire system to handle all possible color spaces simultaneously, thus managing complexity
2Productivity
If the system switches color spaces during encoding and decoding, then coding efficiency improves for mixed content, but additional syntax elements and processing steps increase the complexity of the codec system
Solution Approach 1:
The patent applies local quality by allowing different color spaces to be used for different regions or portions of the video sequence based on content characteristics. Syntax elements are introduced only where color space changes occur, rather than throughout the entire sequence, minimizing the overhead while maximizing the benefit of localized optimization for screen capture versus natural video content
Solution Approach 2:
The patent changes the color space parameter dynamically during encoding and decoding by introducing syntax elements that signal color space identifiers and transformation matrices. These parameter changes are implemented through conditional processing paths in the encoder and decoder, allowing efficient switching without fundamentally redesigning the entire codec architecture
3Measurement precision
If the codec processes different color spaces within a single video sequence, then rate-distortion performance improves, but the processing time and computational load increase
Solution Approach 1:
The patent performs preliminary action by pre-defining color space transformation matrices and parameters that can be reused during encoding and decoding. The syntax elements signal which pre-defined transformations to apply, avoiding the need to compute transformations from scratch and reducing processing time while maintaining optimal rate-distortion performance for different color spaces
Data Source
AI summary
Innovations in encoding or decoding when switching color spaces are presented. For example, some of the innovations relate to signaling of control information for adaptive color space transformation (“ACT”). Other innovations relate to ACT operations. These innovations can improve coding efficiency when switching between color spaces during encoding and decoding.