| --- |
| dataset_info: |
| features: |
| - name: created_at |
| dtype: string |
| - name: sequence |
| sequence: |
| sequence: float64 |
| - name: width |
| dtype: float64 |
| - name: height |
| dtype: float64 |
| - name: preview_image |
| dtype: image |
| - name: num_points |
| dtype: int64 |
| - name: duration |
| dtype: float64 |
| - name: avg_force |
| dtype: float64 |
| - name: min_force |
| dtype: float64 |
| - name: max_force |
| dtype: float64 |
| - name: avg_altitude |
| dtype: float64 |
| - name: min_altitude |
| dtype: float64 |
| - name: max_altitude |
| dtype: float64 |
| - name: avg_azimuth_sin |
| dtype: float64 |
| - name: min_azimuth_sin |
| dtype: float64 |
| - name: max_azimuth_sin |
| dtype: float64 |
| - name: avg_azimuth_cos |
| dtype: float64 |
| - name: min_azimuth_cos |
| dtype: float64 |
| - name: max_azimuth_cos |
| dtype: float64 |
| - name: signer |
| dtype: string |
| splits: |
| - name: train |
| num_bytes: 10848294.0 |
| num_examples: 137 |
| download_size: 8296862 |
| dataset_size: 10848294.0 |
| configs: |
| - config_name: default |
| data_files: |
| - split: train |
| path: data/train-* |
| extra_gated_description: Due to the consent forms we use, we cannot share the dataset |
| with others. But we may be able to help other researchers seek permission from the |
| signatories. |
| extra_gated_fields: |
| Country: country |
| Institution: text |
| I want to use this dataset for: text |
| --- |
| |
| # 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**. |
|
|
