Court Keypoint Tool

Mark the 12 K-order court keypoints on the real painted lines, then export them for a camera.

Internal

Court view

court outline service + center lines net line keypoint

Load or upload a court frame, then click each of the 12 points in order.

Controls

Mark 12 points

Check / paste

Frame

Click each point on the painted line, in K-order. Click a row to re-place it.

0 / 12 placed

Scroll to zoom into the far points, drag to pan, then click. Arrow keys nudge the selected point by 1px (Shift = 10px).

Presets

court-4-rise (pdleye) test-1821

Output

court_keypoints (JSON, ready to register)

Points

#	x	y	location

Data received from pdleye

court-4-rise (1920x1080, net_ratio 0.5), hand-marked and returned by Konstantin. Load it above to draw it, or paste it in Check to run the geometry check. Validated against the known-good 1821 camera: net and far-service tight, near-service offset is expected lens distortion, the same fingerprint as our reference camera.

The 12 points are marked directly on the painted court lines, that is the accurate way, since a wide-angle lens bends the near lines away from any 4-corner estimate. K-order: 0-1 near baseline, 2-3-4 near service, 5-6 net, 7-8-9 far service, 10-11 far baseline. Left before right, near before far.