Chalk

CHALKdigital chalking · web

Live plate detection, OCR and GPS-tagged reads in the browser. Point the rear camera along a row of parked cars.

or run on a photo / video file

Settings

Camera

Lens Resolution Fit Source file

Alerts

Sound Vibration / haptics Beep on every read

iPhone: sound plays even on silent (it pauses music). Safari has no vibration API; iOS 18+ gives a light haptic tick instead. Violations also flash the screen.

Detection

Model size Backend Confidence Box smoothing

Reads

OCR OCR model OCR backend Min crop width (px) Reads per plate Region Officer Violation after (minutes) Second pass max (hours) Second pass radius (m) Duplicate window (s) Duplicate radius (m)

Whitelist never stored · one per line: PLATE, reason

Hotlist stored + alert · one per line: PLATE, reason

Lists and settings are kept in this browser only.

Benchmark

Runs 200 inference frames on the current source, backend and model. OCR keeps running (its live timings are reported), then the OCR model is timed alone for 100 runs.