LiveMathProduct Design
Handwriting Biometrics
Sign on a pad and see your signature as equations: fitted curves, how you signed, and a replay of the signing you can export. Everything runs in your browser; nothing you draw is uploaded.
Built on Browser drawing · Pen and touch input · Equation typesetting · Video recording
A signature is not a picture. It is a movement through time, with a position, a speed and a pressure, and this tool records it as one. Sign on the pad and it fits the stroke with two mathematical models, writes them out as equations, measures how you signed, and replays the signing with a pen.
It stops before the writer model, on purpose: one signature measures a moment, not an identity.
Capture
Pointer events sampled as position, time, pressure and tilt, on a fixed 1000 × 400 pad.
Process
Each stroke resampled every 1.5 units, then lightly smoothed.
Model
Bézier curves by Schneider's algorithm, and a cosine series by a type-I DCT.
Measure
Curvature, speed, pressure, slant, pen lifts and pauses.
Replay
The recorded rhythm or one steady speed, exported as video or GIF.
- To load the whole tool
- 116 KB
- compressed; the equations' fonts load only when needed
- Requests to a server
- 0
- fitting, replay and export run in the browser
- Models of every stroke
- 2
- Bézier and Fourier
- Runs
- In the browser
- Stores
- Nothing: no upload, no account
- Input
- Pen with pressure, mouse or touch
- Exports
- MP4 or WebM, GIF, LaTeX
