3. Detect — optional, if your animals wear tags#
If your animals carry printed AprilTags, a detector can read the tag position off every frame on its own. A detection counts exactly like a click, so the fill interpolates between both. Skip this page if there are no tags.
Print the tags#
On the start page, open 🛠 More tools ▸ Print tag sheet…, keep the default
family tag36h11, set the tag size in millimetres and print the PDF.
AprilTag families. tag36h11 is the default; tag16h5 has a coarser grid for
very small animals or low-resolution video.#
Printing — all four of these matter
Do not cut off the white border. Cut in the white, never on the black edge.
Print at 100 % / actual size. Each sheet has a 50 mm rule: measure it.
Matte paper on a laser printer, black cartridge only.
Glue the tag to card so it stays flat.
Run the detector#
Family must match what you printed.
Leave Downscale at
1.0; raise Sharpening if the video is blurry.Choose a frame range and press Run detector.
Detections appear as hollow markers with a dot. The first time, Ethograph asks which tag ID is which keypoint and individual; correct any wrong guess in the table. A detection never overwrites your own label.[1]