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SignSeq-dataset

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SignSeq Dataset

The SignSeq dataset contains time-series handwriting signature traces collected at 240 Hz by Apple Pencil on iPad. Each example records the full stroke sequence along with per-stroke metadata and a rendered preview image. Intended use cases include signature generation, style analysis, and handwriting modelling.

Features

Each record contains the following fields:

Field Type Description
created_at string ISO-8601 timestamp of recording start.
sequence sequence<sequence<float>> A list of points: each [t, x_rel, y_rel, force, altitude, azimuth_sin, azimuth_cos].
width float64 Original signature width. Used to de-normalize x_rel back to pixel coordinates.
height float64 Original signature height. Used to de-normalize y_rel back to pixel coordinates.
preview_image image PNG rendering of the full signature trace.
num_points int64 Total number of captured points in sequence.
duration float64 Recording duration in seconds.
avg_force float64 Mean pen pressure over the signature.
min_force float64 Minimum pen pressure.
max_force float64 Maximum pen pressure.
avg_altitude float64 Mean pen altitude angle (radians).
min_altitude float64 Minimum pen altitude angle (radians).
max_altitude float64 Maximum pen altitude angle (radians).
avg_azimuth_sin float64 Mean sine of pen azimuth angle (radians).
min_azimuth_sin float64 Minimum sine of pen azimuth angle (radians).
max_azimuth_sin float64 Maximum sine of pen azimuth angle (radians).
avg_azimuth_cos float64 Mean cosine of pen azimuth angle (radians).
min_azimuth_cos float64 Minimum cosine of pen azimuth angle (radians).
max_azimuth_cos float64 Maximum cosine of pen azimuth angle (radians).
signer string Anonymized signer identifier.

Notes on sequence

  • Element breakdown
    1. t : Relative timestamp in seconds (starts at 0.0 for the first point).
    2. x_rel, y_rel : Relative coordinates in [0, 1], to be multiplied by width/height to recover pixel positions.
    3. force : Pen pressure (unitless).
    4. altitude : Pen altitude angle in radians.
    5. azimuth_sin, azimuth_cos : Sine and cosine of pen azimuth angle in radians.
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