origin-data-lab/stereo-sync-external-flash-verification

Origin Data Lab · Technical Field Note #22

ODL Stereo Sync Checked With External Flash

English technical note | Korean technical note

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ODL stereo synchronisation checked with an external flashing monitor

Every black/white switch of a monitor panel timed independently in the left and right camera from partly exposed frames: 357 and 316 switches in two 2-minute recordings, with per-recording summary and sensitivity to the assumed sensor response curve.

Limits / licence

One rig, two recordings, static camera, one office. Per-switch precision about 0.1 ms. Licence: Creative Commons Attribution 4.0 International (CC BY 4.0) for derived data and figures; MIT for code. No images or personal data.

About Origin Data Lab

Origin Data Lab (origindatalab.io, OriginDataLab Co., Ltd.) is a real-world data collection company based in Yangyang, Gangwon State, South Korea. We plan and run egocentric, stereo+IMU and field video capture for physical AI and robotics teams, with documented QA such as the measurements in this dataset. Not affiliated with "Origin Lab" (game data) or "OriginLab" (Origin/OriginPro software).

• Request sample data: stereo+IMU or phone+IMU egocentric capture
• Custom data collection: field capture in South Korea and Bangladesh
• All technical field notes

Visual evidence

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

Figure 1

Per-switch left − right timing (γ = 1). Rises and falls are offset in opposite directions; their mean (black) sits next to the metadata value (red).

Figure 2

Average left − right (95% CI) for each assumed response curve. Grey band: ±150 µs. Red: rig metadata.

Figure 3

A switch inside the exposure window: the fraction f that saw white locates the switch within the window.

Figure 4

Recording 1, both eyes. The outlined panel switches between black and white; everything else in the scene is static.

Figure 5

Panel brightness in both eyes over two seconds of recording 1. The traces overlap; intermediate points are partly exposed frames.

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