> For the complete machine-readable documentation index, see [llms.txt](/llms.txt). Full corpus: [llms-full.txt](/llms-full.txt).

# Research & Community

Explore the clinical research behind SmartSpectra and connect with developers building contactless applications.

## Join the Community

### Developer Updates (Email)
SDK releases, API changes, and best practices delivered to your inbox.

### Discord
Ask questions, share projects, and connect with other developers building contactless vital sign applications with SmartSpectra.
[Join the Discord](https://discord.com/invite/K7KNmuX7KT)

### GitHub
Explore open-source SDK samples, integration guides, and developer tools for building rPPG and contactless health monitoring applications.
[Follow on GitHub](https://github.com/Presage-Security/SmartSpectra)

## Model Cards

### Continuous Pulse Rate — Pulse Rate
[Model card](https://vandv.presagetech.com/arterial_pressure_model_card.html). Extracts pulse rate from video using Presage's proprietary computer vision pipeline analyzing facial blood flow patterns through consumer-grade cameras.
- Contactless pulse rate measurement from standard video
- Validated across diverse demographics and camera types
- Continuous monitoring without wearables
- Suitable for wellness and informational applications

### Continuous Relative Blood Pressure — Relative BP Waveform
[Model card](https://vandv.presagetech.com/arterial_pressure_model_card.html). Extracts the arterial waveform from video frames using face detection and image processing to infer relative measures of systolic, diastolic, and mean blood pressure.
- High resolution relative blood pressure waveform extraction
- Infers relative systolic, diastolic, and mean blood pressure
- Window-based Pearson's correlation for validation
- Validated across multiple camera platforms

### Continuous Breathing Rate — Breathing Rate (0.55 BrPM MAE)
[Model card](https://vandv.presagetech.com/breathing_model_card.html). Estimates breathing rate and waveform from video analysis of a subject's face, chest, and shoulders, measuring rates between 4–40 breaths per minute.
- MAE of 0.55 BrPM with RMSE of 0.95 BrPM
- 80% return rate at confidence >= 70
- Validated against ETCO2 capnography via Biopac MP160
- Tested on 93 subjects (184 videos) across diverse Fitzpatrick types
- Validated on Logitech C920 and Samsung S24 cameras

### Continuous Heart Rate Variability — HRV (SDNN, RMSSD, Stress Index)
[Model card](https://vandv.presagetech.com/hrv_model_card.html). Measures SDNN, RMSSD, and Stress Index from facial video, providing beat-to-beat variation metrics for research, clinical, and wellness applications.
- Measures SDNN, RMSSD, and Stress Index from video
- Designed for clinicians, polygraphers, and researchers
- Continuous HRV monitoring without wearables
- Validated across multiple camera types and demographics

## Published Research

Published research now lives on the blog: <https://presagetech.com/blog/>

- [Clinical Validation of Contactless Vital Signs Measurement](https://presagetech.com/blog/clinical-validation-of-contactless-vital-signs-measurement) — Frontiers in Medical Technology, January 20, 2026.
- [USAISR Partnering on Imaging Technology for Hemorrhage Triage](https://presagetech.com/blog/usaisr-partnering-on-imaging-technology-for-hemorrhage-triage) — Defense Health Agency, May 22, 2025.
- [Comparison of Camera-Acquired Vital Signs in a Space-Analog Environment](https://presagetech.com/blog/comparison-of-camera-acquired-vital-signs-in-a-space-analog-environment) — Wilderness & Environmental Medicine, November 10, 2024.