| --- |
| license: mit |
| task_categories: |
| - object-detection |
| language: |
| - zh |
| - en |
| pretty_name: LottoScan License Plates |
| tags: |
| - license-plate |
| - ocr |
| - obb |
| size_categories: |
| - n<1K |
| configs: |
| - config_name: default |
| data_files: |
| - split: D_01 |
| path: data/D_01/*.parquet |
| - split: D_05 |
| path: data/D_05/*.parquet |
| --- |
| |
| # LottoScan License Plates |
|
|
| License plate dataset with **4-point oriented bounding boxes** and plate text labels. |
| All images are 640x640 JPEG. |
|
|
| Total samples: **2** |
| Splits: **24** (D-01..D-12 for daytime, N-01..N-12 for nighttime) |
|
|
| ## Categories (4 dims × cartesian) |
|
|
| Split names use underscore (D_NN, N_NN) because HuggingFace forbids |
| dashes in split names. |
|
|
| - Time: D=day / N=night |
| - Distance: near / mid / far (encoded in id index 1-4 / 5-8 / 9-12) |
| - Plate count: 1-2 (odd within block) / 3+ (even within block) |
| - Angle: front <30° (odd) / oblique >30° (even) |
|
|
| Per-split row counts: |
|
|
| | Split | Rows | |
| |-------|------| |
| | D_01 | 1 | |
| | D_02 | 0 | |
| | D_03 | 0 | |
| | D_04 | 0 | |
| | D_05 | 1 | |
| | D_06 | 0 | |
| | D_07 | 0 | |
| | D_08 | 0 | |
| | D_09 | 0 | |
| | D_10 | 0 | |
| | D_11 | 0 | |
| | D_12 | 0 | |
| | N_01 | 0 | |
| | N_02 | 0 | |
| | N_03 | 0 | |
| | N_04 | 0 | |
| | N_05 | 0 | |
| | N_06 | 0 | |
| | N_07 | 0 | |
| | N_08 | 0 | |
| | N_09 | 0 | |
| | N_10 | 0 | |
| | N_11 | 0 | |
| | N_12 | 0 | |
|
|
| ## Schema (per row) |
|
|
| | Field | Type | Description | |
| |------------------|----------------|--------------------------------------------------| |
| | `image` | Image | 640x640 JPEG | |
| | `quadrilaterals` | float[N][4][2] | Normalized 4-point quads, order: 左上→右上→右下→左下 | |
| | `plate_texts` | string[N] | Plate text strings, parallel to quadrilaterals | |
|
|
| ## Usage |
|
|
| ```python |
| from datasets import load_dataset |
| ds_d05 = load_dataset("a27259954/4DataTool", split="D_05") # 中距離 / 1-2 個 / 直視 |
| sample = ds_d05[0] |
| sample["image"] # PIL.Image |
| sample["quadrilaterals"] # [[[x,y],...]] |
| sample["plate_texts"] # ["ABC-1234", ...] |
| ``` |
|
|
