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--- |
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dataset_info: |
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features: |
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- name: created_at |
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dtype: string |
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- name: sequence |
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sequence: |
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sequence: float64 |
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- name: width |
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dtype: float64 |
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- name: height |
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dtype: float64 |
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- name: preview_image |
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dtype: image |
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|
- name: num_points |
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dtype: int64 |
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|
- name: duration |
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|
dtype: float64 |
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- name: avg_force |
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|
dtype: float64 |
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|
- name: min_force |
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dtype: float64 |
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|
- name: max_force |
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dtype: float64 |
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|
- name: avg_altitude |
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dtype: float64 |
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|
- name: min_altitude |
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dtype: float64 |
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- name: max_altitude |
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dtype: float64 |
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- name: avg_azimuth_sin |
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dtype: float64 |
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- name: min_azimuth_sin |
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dtype: float64 |
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- name: max_azimuth_sin |
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dtype: float64 |
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|
- name: avg_azimuth_cos |
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dtype: float64 |
|
|
- name: min_azimuth_cos |
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dtype: float64 |
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- name: max_azimuth_cos |
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dtype: float64 |
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- name: signer |
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dtype: string |
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splits: |
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- name: train |
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num_bytes: 10848294.0 |
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num_examples: 137 |
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download_size: 8296862 |
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dataset_size: 10848294.0 |
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configs: |
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- config_name: default |
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data_files: |
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- split: train |
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path: data/train-* |
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extra_gated_description: Due to the consent forms we use, we cannot share the dataset |
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with others. But we may be able to help other researchers seek permission from the |
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signatories. |
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extra_gated_fields: |
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Country: country |
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Institution: text |
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I want to use this dataset for: text |
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--- |
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# SignSeq Dataset |
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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. |
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## Features |
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Each record contains the following fields: |
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| Field | Type | Description | |
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|-------------------|----------------------------|----------------------------------------------------------------------------------------------------------------------| |
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| `created_at` | `string` | ISO-8601 timestamp of recording start. | |
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| `sequence` | `sequence<sequence<float>>`| A list of points: each `[t, x_rel, y_rel, force, altitude, azimuth_sin, azimuth_cos]`. | |
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| `width` | `float64` | Original signature width. Used to de-normalize `x_rel` back to pixel coordinates. | |
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| `height` | `float64` | Original signature height. Used to de-normalize `y_rel` back to pixel coordinates. | |
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| `preview_image` | `image` | PNG rendering of the full signature trace. | |
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| `num_points` | `int64` | Total number of captured points in `sequence`. | |
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| `duration` | `float64` | Recording duration in seconds. | |
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| `avg_force` | `float64` | Mean pen pressure over the signature. | |
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| `min_force` | `float64` | Minimum pen pressure. | |
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| `max_force` | `float64` | Maximum pen pressure. | |
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| `avg_altitude` | `float64` | Mean pen altitude angle (radians). | |
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| `min_altitude` | `float64` | Minimum pen altitude angle (radians). | |
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| `max_altitude` | `float64` | Maximum pen altitude angle (radians). | |
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| `avg_azimuth_sin` | `float64` | Mean sine of pen azimuth angle (radians). | |
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| `min_azimuth_sin` | `float64` | Minimum sine of pen azimuth angle (radians). | |
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| `max_azimuth_sin` | `float64` | Maximum sine of pen azimuth angle (radians). | |
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| `avg_azimuth_cos` | `float64` | Mean cosine of pen azimuth angle (radians). | |
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| `min_azimuth_cos` | `float64` | Minimum cosine of pen azimuth angle (radians). | |
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| `max_azimuth_cos` | `float64` | Maximum cosine of pen azimuth angle (radians). | |
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| `signer` | `string` | Anonymized signer identifier. | |
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### Notes on `sequence` |
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- **Element breakdown** |
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1. `t` : Relative timestamp in seconds (starts at `0.0` for the first point). |
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2. `x_rel`, `y_rel` : Relative coordinates in [0, 1], to be multiplied by `width`/`height` to recover pixel positions. |
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3. `force` : Pen pressure (unitless). |
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4. `altitude` : Pen altitude angle in **radians**. |
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5. `azimuth_sin`, `azimuth_cos` : Sine and cosine of pen azimuth angle in **radians**. |
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