Reference Picture Resampling With Same-Size 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 inefficiencies 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 during reference picture resampling and optimizing resource usage in both encoder and decoder.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple picture sizes and conformance windows are supported in video coding, then video coding versatility and adaptability are improved, but processing complexity and resource consumption increase

Engineering Contradiction:

Improvesupport for multiple picture sizes and conformance windowsVSAvoidprocessing complexity in encoding and decoding

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by establishing a constraint rule that links picture size parameters to conformance window parameters. When the picture width and height are the same, the conformance window parameters (left offset, right offset, top offset, bottom offset) must also be the same. This parameter constraint simplifies the decoding process by reducing the number of independent parameters that need to be processed, thereby resolving the contradiction between supporting multiple picture sizes and maintaining processing simplicity.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If reference picture resampling is enabled to handle different picture sizes, then video coding adaptability is improved, but processor and memory resource usage increase

Engineering Contradiction:

Improvereference picture resampling capabilityVSAvoidprocessor and memory resource usage

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent applies preliminary anti-action by pre-establishing constraint rules that prevent the need for complex resampling operations. By constraining conformance window parameters based on picture size parameters before decoding occurs, the system avoids the need for resource-intensive reference picture resampling in many cases. This preliminary constraint prevents the harmful effect of excessive resource consumption while maintaining the necessary adaptability.

Inventive Principle:

Principle #9Preliminary anti-action

3Ease of operation

If conformance window parameters are independently specified for each picture parameter set, then coding flexibility is improved, but processing overhead and complexity increase

Engineering Contradiction:

Improvecoding flexibilityVSAvoidprocessing overhead

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The patent applies universality by creating a universal constraint rule that applies across all picture parameter sets. The rule states that picture parameter sets with the same picture size must have the same conformance window parameters. This universal constraint reduces processing overhead by allowing the decoder to infer conformance window parameters from picture size parameters, eliminating the need to independently process and store separate conformance window parameters for each picture parameter set, while still maintaining coding flexibility where needed.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12439048B2Handling of multiple picture size and conformance windows for reference picture resampling in video coding

Publication Date: 2025.10.07 HUAWEI TECH CO LTD

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.