Reference Picture Resampling with Unified Conformance Windows
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Solution Overview
Problem
Existing video coding technologies face challenges in efficiently managing multiple picture sizes and conformance windows, leading to complex processing and resource utilization issues in both encoding and decoding processes.
Innovation Solution
Constraining picture parameter sets with the same picture size to have the same conformance window size, thereby reducing complex processing and resource usage by ensuring consistent conformance window sizes across picture parameter sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple picture parameter sets with different conformance windows are supported, then video coding flexibility and adaptability are improved, but processing complexity and resource usage increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the conformance window parameters based on the picture size. When the picture size changes, the conformance window parameters are updated accordingly, allowing the system to adapt to different picture sizes while maintaining consistent processing complexity. This is achieved by deriving conformance window parameters from picture size parameters, ensuring that the system can handle multiple picture sizes without proportionally increasing processing complexity.
2Productivity
If reference picture resampling is enabled for multiple picture sizes, then coding efficiency is improved, but processor and memory resource usage increase
Solution Approach 1:
The patent applies local quality by performing reference picture resampling only when necessary, specifically when the picture size changes. Instead of uniformly applying resampling to all pictures, the system selectively applies resampling based on the local requirement of each picture's size characteristics. This approach maintains coding efficiency by enabling resampling where needed while reducing unnecessary processor resource usage for pictures that do not require resampling.
3Manufacturing precision
If conformance window parameters are independently specified for each picture parameter set, then coding precision is improved, but device complexity and resource usage increase
Solution Approach 1:
The patent applies universality by establishing a unified relationship between picture size parameters and conformance window parameters. Instead of independently specifying conformance window parameters for each picture parameter set, the system uses a universal derivation rule that calculates conformance window parameters based on picture size parameters. This approach maintains coding precision by ensuring accurate conformance window specification while reducing device complexity through parameter interdependence rather than independent management.
Data Source
AI summary
A method of decoding includes receiving a first picture parameter set and a second picture parameter set each referring to same sequence parameter set, the first picture parameter set and the second picture parameter set having same values of a conformance window when the first picture parameter set and the second picture parameter set have same values of picture width and picture height, and applying the conformance window to a current picture corresponding to the first picture parameter set or the second picture parameter set.