Signature Dynamics — Biometric Workshop

Draw your signature Stroke colour = velocity (red = slow / thick, green = fast / thin)

Velocity over time (pen speed)

Slow → Fast (pen speed) Line width ∝ pressure (slower = thicker)

Draw your signature in the box above.

Dynamics Stats

Duration —

Path length —

Avg velocity —

Peak velocity —

Strokes —

Direction changes —

Feature Vector (8 features)

Each cell is one normalised feature. Darker = smaller. A consistent signer produces similar patterns each time.

Signature Verification

Sign 3 times — your rhythm is the biometric.

Enrolled profiles

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How signature dynamics works

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1. Capture

Each point records x, y and a timestamp

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2. Velocity

Speed and direction computed between consecutive points

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3. Features

Compact vector: path length, duration, speed stats, stroke count, aspect ratio

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4. Match

Normalised feature vectors compared with relative error similarity

Why shape alone isn’t enough: A static image of your signature can be copied. The dynamics — how fast you move, where you accelerate, how long each stroke takes — are unique and very difficult to forge consciously.