Signaling Scaling Window Information in Video Coding
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Solution Overview
Problem
Current video coding standards face challenges in efficiently signaling and decoding scaling window information, particularly when dealing with multiple tiles in a picture, which affects the performance of in-loop filtering and slice modes.
Innovation Solution
Incorporating syntax elements in a picture parameter set to indicate the presence and values of scaling window offset parameters, allowing for the signaling of these parameters when necessary, and parsing these elements to determine the appropriate decoding and encoding processes for pictures with multiple tiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If scaling window offset parameters are always signaled in the bitstream, then decoding accuracy is improved, but bitstream complexity and transmission overhead increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the signaling of scaling window offset parameters based on picture characteristics. When pictures have multiple tiles, the scaling window offset parameters are signaled; otherwise, they are not signaled. This conditional parameter signaling resolves the contradiction by adapting the bitstream content to actual decoding needs, improving accuracy only when necessary while minimizing overhead.
2Stability of the object's composition
If scaling window offset parameters are signaled for all pictures, then encoding consistency is improved, but transmission efficiency deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the encoding approach based on picture structure characteristics. For pictures with multiple tiles, scaling window offset parameters are signaled to maintain encoding consistency; for single-tile pictures, these parameters are omitted to improve transmission efficiency. This localized approach ensures consistency only where structurally necessary.
3Reliability
If in-loop filtering is performed across tile boundaries, then video quality is improved, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by signaling the in-loop filtering disable flag and scaling window offset parameters in advance during the encoding phase. This allows the decoder to prepare appropriate filtering configurations before processing, enabling quality-preserving cross-tile filtering when needed while avoiding unnecessary processing complexity when tiles are independent.
Data Source
AI summary
A device may be configured to signal scaling window information according to one or more of the techniques described herein.