Change Request Summary: HDR Images Support for FS_AIF_MED

Document Information

• CR Number: S4-260264
• Specification: 26.9xx (version xx.x.x)
• Work Item: FS_AIF_MED
• Category: B (addition of feature)
• Release: Rel-20
• Source: Apple Inc.

Overview

This Change Request proposes the addition of High Dynamic Range (HDR) imaging support to the AI for Media feasibility study. The CR introduces a new scenario for HDR images with supporting references and framework for evaluation.

Main Technical Contributions

Section 2: References

The CR adds seven new normative/informative references to support HDR imaging:

1. Platform-specific HDR implementations:
2. Apple developer documentation on HDR image support [1]

3. Android Ultra HDR Image Format documentation [2]

4. ISO/IEC standards:

5. ISO/IEC 23008-12: Image File Format for high efficiency coding [3]
6. ISO 22028-5: Extended colour encodings for HDR/WCG still images [6]

7. ISO 21496-1: Gain map metadata for dynamic range conversion [7]

8. 3GPP and GSMA specifications:

9. 3GPP TS 26.143: Messaging Media profiles [4]
10. GSMA RCC.71: RCS Universal Profile Service Definition [5]

Section 5.x: New Scenario for HDR Images

5.x.1 Overview

• Defines HDR imaging as capturing greater range of light and dark tones compared to standard photography
• Highlights improved contrast and color on compatible displays
• References existing ecosystem implementations on major device platforms
• Emphasizes capability for modern devices to capture and share realistic images

5.x.2 Review of Previous Work

• Identifies existing standardization support in ISO/IEC 23008-12 [3]
• Lists relevant HDR imaging standards:
• ISO 22028-5 for HDR stills with extended colour encodings
• ISO 21496-1 for HDR gain maps
• Notes 3GPP SA4 support in messaging applications (TS 26.143)
• References GSMA RCS support for HDR feature

5.x.3 Evaluation Criteria and Metrics

• Status: To be completed (Editor's Note)

5.x.4 Evaluation Methodology

• Status: Framework established but content to be completed
• Two subsections defined:
• 5.x.4.1: Objective performance evaluation (TBC)
• 5.x.4.2: Subjective performance evaluation (TBC)

Key Technical Points

1. Standards Alignment: The proposal builds upon existing ISO/IEC and 3GPP work, ensuring compatibility with established HDR imaging standards

2. Ecosystem Support: References both major mobile platforms (iOS and Android) demonstrating industry readiness

3. Messaging Integration: Leverages existing 3GPP TS 26.143 and GSMA RCS specifications for messaging applications

4. Evaluation Framework: Establishes placeholder structure for both objective and subjective evaluation methodologies (content pending)

Status

This is an initial framework CR with several sections marked for future completion, particularly the evaluation criteria and methodology sections.