# Summary of 3GPP Technical Document S4-260266

## Document Metadata
- **Meeting**: SA4 #135, India, 9-13 February 2026
- **Source**: Apple Inc.
- **Work Item**: FS_AIF_MED (Feasibility Study on AI for Media)
- **CR Category**: B (addition of feature)
- **Release**: Rel-20
- **Title**: Stereo Images

## Main Technical Contributions

### New Scenario Addition: Stereoscopic Images (Section 5.x)

This CR proposes adding a new scenario to the FS_AIF_MED study focusing on the usage of stereoscopic images.

#### Overview (5.x.1)

The contribution introduces the use case for immersive stereoscopic image formats:

- **Capture Technology**: Modern systems use dual capture configurations mimicking human binocular vision with natural eye separation
- **Playback**: Stereoscopic images are processed for HMDs where unique images are rendered per eye to create depth perception
- **Projection Standards**: Commercial devices support mapping high-resolution captures to VR180 and VR360 formats
- **User Experience**: Provides presence and immersion beyond traditional photography, with viewing platforms handling critical adjustments for optimal experience

#### Review of Previous Work (5.x.2)

The contribution references existing technologies and specifications:

- **Storage Format**: High Efficiency Image File Format (HEIF) combines stereo pairs with essential metadata [ISO/IEC 23008-12:2025]
- **Compression**: Multiview HEVC (MV-HEVC) employs inter-view prediction to reduce bandwidth by avoiding storage of two full redundant streams [ISO/IEC 23008-2:2025]
- **3GPP Precedent**: TS 26.265 already specifies usage of these tools for stereoscopic video

#### Evaluation Framework (5.x.3 and 5.x.4)

The contribution includes placeholder sections for:
- Evaluation criteria and metrics
- Evaluation methodology (both objective and subjective performance evaluation)

These sections are marked with Editor's Notes indicating they are to be completed in future revisions.

### References Added

The CR adds six normative/informative references:
1. Canon RF5.2mm F2.8 L Dual Fisheye documentation
2. Meta Quest immersive media formats documentation
3. Apple spatial photos and videos documentation
4. ISO/IEC 23008-12:2025 (HEIF)
5. ISO/IEC 23008-2:2025 (HEVC)
6. 3GPP TS 26.265 (Video Capabilities and Operation Points)

## Document Status

This appears to be an initial text proposal establishing the framework for studying stereoscopic images within the AI for Media feasibility study. The evaluation sections are placeholders awaiting further development and agreement.