ringgrid — interactive demo

Re-run automatically on change

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Calibration target

Target geometry

Every sample carries its own target spec; picking one here also sets the geometry used when you upload your own image. Detection runs in adaptive multi-scale mode, so markers are found without knowing their pixel size in advance.

Sample image

Overlay

Outer ellipses Marker centers Labels (ID / grid coord) Origin dots & cell

Detection

propose → fit → decode → homography

conf ≥ 0.7 0.4–0.7 < 0.4 origin