Cupido — barrier picker

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Who are you?

Enter your initials so we can record who annotated each video. (Just letters, e.g. GG.)

Welcome to the Cupido barrier picker

For each tracked video you'll mark the moment the barrier between the two halves of the arena is removed and the flies start interacting. That timestamp is what every downstream "post-opening" analysis needs.

How to annotate one video

Drag the seekbar to the end of the video and check whether all ROIs are open or only the upper or lower half. This determines which button you'll click later.
Drag back toward the beginning to roughly find the moment the barrier(s) lift. The opening can be anywhere from a few seconds to several minutes in.
Use the arrow keys to pin down the exact frame: ←/→ jump ±5 s, Shift+arrow jump ±30 s. Pause the player on the opening frame.
Click the button matching what opened — the playhead time is recorded, ROI inclusion is set accordingly, and the next video loads automatically.

The three buttons

All barriers open — every ROI usable
Upper barrier opens — only ROIs 1, 3, 5 (top row); lower row will be excluded from analysis
Lower barrier opens — only ROIs 2, 4, 6 (bottom row); upper row excluded

Other controls

Space play/pause · 1/2/3 the three buttons · s skip · u mark unusable

Each click saves to barrier_opening.csv immediately, so closing the tab and coming back resumes from where you left off.

Space play/pause · ← / → ±5 s · Shift+arrows ±30 s · drag the seekbar for finer control