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---

license: cc-by-4.0
pretty_name: ODL Stereo Frame Pairing Counter Offset (Field Note 18)
tags: [stereo, imu, egocentric, data-quality, physical-ai]
---


<!-- ODL_QUALITY_V2 -->

# Origin Data Lab · Technical Field Note #18

**ODL Stereo Frame Pairing Counter Offset**

[![GitHub](https://img.shields.io/badge/GitHub-Open-181717?style=for-the-badge&logo=github&logoColor=white)](https://github.com/origin-data-lab/stereo-frame-pairing-strobe-counter-offset) [![Hugging Face](https://img.shields.io/badge/Hugging_Face-Open-FFD21E?style=for-the-badge&logo=huggingface&logoColor=white)](https://huggingface.co/datasets/origin-data-lab/stereo-frame-pairing-strobe-counter-offset) [![Kaggle](https://img.shields.io/badge/Kaggle-Open-20BEFF?style=for-the-badge&logo=kaggle&logoColor=white)](https://www.kaggle.com/datasets/origindatalab/odl-stereo-frame-pairing-counter-offset) [![Technical Note](https://img.shields.io/badge/Technical_Note-Open-0B1220?style=for-the-badge&logo=read-the-docs&logoColor=white)](https://origindatalab.io/technical-field-notes/stereo-frame-pairing-strobe-counter-offset.html)

[English technical note](https://origindatalab.io/technical-field-notes/stereo-frame-pairing-strobe-counter-offset.html) | [Korean technical note](https://origindatalab.io/ko/technical-field-notes/stereo-frame-pairing-strobe-counter-offset.html)

---

# ODL Stereo Frame Pairing Counter Offset
Per-file and per-session stereo timing from 4 days (957,332 frame pairs): left/right strobe-counter offset, exposure-start difference, counter-pairing error.

Source note: https://origindatalab.io/technical-field-notes/stereo-frame-pairing-strobe-counter-offset.html
## Limits / licence
One rig, one operator, four mornings. Licence: Creative Commons Attribution 4.0 International (CC BY 4.0) for derived data and figures; MIT for code. No images or personal data.

## Visual evidence

Figures are taken from the released technical-note package. Interpret with the original methods and limitations.

### Figure 1

![Bar chart of the left minus right strobe counter per session, from minus 1243 to plus 3009 frames](figures/fn18_counter_offset_by_session.png)

*Left − right strobe counter for each work session, coloured by day.*

### Figure 2

![Two histograms: left shows counter-based pairs seconds apart, right shows order-based pairs about 15 microseconds apart](figures/fn18_pairing_rule_comparison.png)

*The same 957,332 frames under the two pairing rules. Pairs that the counter rule gets right (offset 0) fall below the left panel's range.*

### Figure 3

![Diagram of six left frames numbered 1048 to 1053 paired with right frames numbered 1000 to 1005](figures/fn18_pairing_schematic.png)

*The same exposures carry different counter values in the two eyes. In this session the left counter is always the right counter plus 48.*

### Figure 4

![Histogram of left-right exposure start differences concentrated between 12 and 18 microseconds](figures/fn18_sync_histogram.png)

*Exposure-start difference of every order-based pair: the rig's true stereo synchronisation.*


---

## Explore Origin Data Lab

[![GitHub](https://img.shields.io/badge/GitHub-Open-181717?style=for-the-badge&logo=github&logoColor=white)](https://github.com/origin-data-lab/stereo-frame-pairing-strobe-counter-offset) [![Hugging Face](https://img.shields.io/badge/Hugging_Face-Open-FFD21E?style=for-the-badge&logo=huggingface&logoColor=white)](https://huggingface.co/datasets/origin-data-lab/stereo-frame-pairing-strobe-counter-offset) [![Kaggle](https://img.shields.io/badge/Kaggle-Open-20BEFF?style=for-the-badge&logo=kaggle&logoColor=white)](https://www.kaggle.com/datasets/origindatalab/odl-stereo-frame-pairing-counter-offset) [![Technical Note](https://img.shields.io/badge/Technical_Note-Open-0B1220?style=for-the-badge&logo=read-the-docs&logoColor=white)](https://origindatalab.io/technical-field-notes/stereo-frame-pairing-strobe-counter-offset.html)

[Official Website](https://origindatalab.io/) | [Technical Field Notes](https://origindatalab.io/technical-field-notes/) | [English Note](https://origindatalab.io/technical-field-notes/stereo-frame-pairing-strobe-counter-offset.html) | [Korean Note](https://origindatalab.io/ko/technical-field-notes/stereo-frame-pairing-strobe-counter-offset.html)

[GitHub](https://github.com/origin-data-lab/stereo-frame-pairing-strobe-counter-offset) | [Hugging Face](https://huggingface.co/datasets/origin-data-lab/stereo-frame-pairing-strobe-counter-offset) | [Kaggle Dataset](https://www.kaggle.com/datasets/origindatalab/odl-stereo-frame-pairing-counter-offset) | [Kaggle Notebook](https://www.kaggle.com/code/origindatalab/odl-stereo-frame-pairing-counter-offset-notebook)