HDR Video Stitching Metadata Alignment

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Solution Overview

Problem

The HDR10 standard does not define behavior for client devices when mismatches occur between the metadata of primary and secondary HDR content, leading to potential video quality degradation or session failure during content stitching.

Innovation Solution

Implement strategies such as tone-mapping and re-encoding secondary content to match the metadata of primary content, evaluating HDR10 metadata values for compatibility, and dynamically adjusting metadata to ensure seamless stitching and playback.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If secondary content with different HDR metadata is stitched with primary content, then content diversity and adaptability are improved, but metadata mismatch causes video quality degradation

Engineering Contradiction:

Improvecontent stitching capabilityVSAvoidvideo quality

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent dynamically adjusts HDR metadata parameters (max_cll, max_fall, transfer_characteristics) of secondary content to match the primary content's metadata. This parameter transformation resolves the contradiction by modifying the secondary content's characteristics to be compatible with the primary content, enabling seamless stitching without quality degradation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces an intermediary processing step that mediates between secondary content with different metadata and primary content. This intermediary process evaluates metadata compatibility, transforms incompatible metadata, and ensures seamless integration, thus resolving the metadata mismatch problem while maintaining video quality.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If HDR metadata values are dynamically adjusted for secondary content, then stitching compatibility is improved, but processing complexity increases

Engineering Contradiction:

Improvemetadata compatibilityVSAvoidprocessing complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent performs preliminary evaluation of HDR metadata compatibility before stitching operations. By pre-assessing whether secondary content metadata matches primary content metadata and pre-transforming incompatible metadata, the system avoids complex runtime processing and simplifies the overall stitching operation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamic metadata adjustment that adapts to different content combinations. The system selectively applies metadata transformation only when needed (when mismatch is detected), rather than always processing, thus optimizing the balance between compatibility and processing complexity based on actual requirements.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11617010B1High dynamic range video content stitching

Publication Date: 2023.03.28 AMAZON TECH INC

AI summary

Methods and apparatus are described that relate to stitching different streams of high dynamic range (HDR) content together and handling HDR metadata mismatches between the differently produced content streams.