| --- |
| license: cc-by-nc-4.0 |
| task_categories: |
| - object-detection |
| language: |
| - km |
| tags: |
| - document-layout |
| - khmer |
| - coco |
| - object-detection |
| pretty_name: ARDB Daily Bulletin Layout (COCO) |
| size_categories: |
| - n<1K |
| dataset_info: |
| features: |
| - name: image |
| dtype: image |
| - name: image_id |
| dtype: int64 |
| - name: file_name |
| dtype: string |
| - name: doc_id |
| dtype: string |
| - name: source |
| dtype: string |
| - name: width |
| dtype: int64 |
| - name: height |
| dtype: int64 |
| - name: objects |
| struct: |
| - name: id |
| list: int64 |
| - name: bbox |
| list: |
| list: float32 |
| length: 4 |
| - name: category_id |
| list: int64 |
| - name: category |
| list: string |
| - name: area |
| list: float32 |
| - name: iscrowd |
| list: int64 |
| - name: score |
| list: float32 |
| splits: |
| - name: train |
| num_bytes: 44962530 |
| num_examples: 136 |
| - name: validation |
| num_bytes: 2984508 |
| num_examples: 9 |
| - name: test |
| num_bytes: 7316400 |
| num_examples: 21 |
| download_size: 55251553 |
| dataset_size: 55263438 |
| configs: |
| - config_name: default |
| data_files: |
| - split: train |
| path: data/train-* |
| - split: validation |
| path: data/validation-* |
| - split: test |
| path: data/test-* |
| --- |
| |
| # ARDB Daily Bulletin Layout Detection (COCO) |
|
|
| A document-layout **object-detection** dataset built from **ARDB (Agricultural and Rural |
| Development Bank of Cambodia) daily market-price bulletins** — born-digital Khmer-language PDFs, |
| one price table per page. Every page is annotated with bounding boxes for five layout regions |
| (table, text, section header, page furniture, picture). |
|
|
| Each row is a full page image with its box annotations embedded, so the Dataset Viewer shows |
| the image beside its labels. |
|
|
| The source corpus spans a multi-year range (2022–2026), covering both structural bulletin |
| templates in circulation over that period. Supersedes `ardb-layout-coco-v4` (same annotations; |
| that card documents the split-assignment issue this version fixes). |
|
|
| ## Dataset structure |
|
|
| | Split | Pages | Boxes | Source documents | |
| |------------|------:|------:|------------------:| |
| | train | 136 | 636 | 45 bulletins (14 retail_only + 31 wholesale_retail) | |
| | validation | 9 | 42 | 3 bulletins (1 retail_only + 2 wholesale_retail) | |
| | test | 21 | 98 | 7 bulletins (1 retail_only + 6 wholesale_retail) | |
| | **total** | **166**| **776**| **55 bulletins** | |
|
|
| Splits are assigned by document, clustered by issue date (documents dated within 1 day of each |
| other are kept in the same split) and stratified by template era (each era's clusters are split |
| independently, then merged), so no bulletin's pages appear in more than one split, no near- |
| duplicate adjacent-day bulletin straddles a split boundary, and both structural templates are |
| represented in every split. |
|
|
| ### Fields |
|
|
| | Column | Type | Description | |
| |-------------|-----------------|-------------| |
| | `image` | image | Embedded page image (JPG). | |
| | `image_id` | int64 | Row index within the split. | |
| | `file_name` | string | Source image file name. | |
| | `doc_id` | string | Identifier of the originating bulletin. | |
| | `source` | string | Originating PDF (provenance). | |
| | `width` | int64 | Image width in pixels. | |
| | `height` | int64 | Image height in pixels. | |
| | `objects` | struct of lists | Per-box annotations (see below). | |
|
|
| `objects` is a struct of parallel lists carrying the full COCO annotation fields: |
|
|
| - `id` — annotation id (unique within its split; renumbered from v4 since pages moved |
| between splits — not semantically meaningful, no consumer reads it) |
| - `bbox` — `[x, y, width, height]` in pixels (COCO convention) |
| - `category_id` — class index (0–4, see below) |
| - `category` — human-readable class name |
| - `area` — box area in px² |
| - `iscrowd` — always `0` |
| - `score` — annotation confidence (`1.0`, human-verified) |
|
|
| ### Classes |
|
|
| | id | name | Notes | |
| |----|------------------|------------------------------------------| |
| | 0 | `Table` | The price table — exactly one per page, covering the full table including header row and label columns. | |
| | 1 | `Text` | Body / paragraph text, including footer notes. | |
| | 2 | `Section-Header` | Headings and titles. | |
| | 3 | `Page-Furniture` | Page headers and footers (2 per page). | |
| | 4 | `Picture` | Logos and stamps (1 per page). | |
|
|
| ## Usage |
|
|
| ```python |
| from datasets import load_dataset |
| |
| ds = load_dataset("Soxavin/ardb-layout-coco-v5") # splits: train / validation / test |
| row = ds["train"][0] |
| row["image"] # PIL image |
| row["objects"]["bbox"] # list of [x, y, w, h] |
| row["objects"]["category"] # list of class names |
| ``` |
|
|
| ## Data collection & annotation |
|
|
| 1. **Source.** Publicly published ARDB daily market-price bulletins spanning 2022–2026, |
| rendered page-by-page at 200 DPI. |
| 2. **Pre-annotation.** Candidate boxes were generated automatically with a document-layout |
| detector (Surya) and confidence-filtered, then mapped to the five-class set above. |
| 3. **Human correction.** Every page was reviewed and corrected in Roboflow: fragmented table |
| regions merged to one box per page, footer text unified under a single `Text` label, box |
| edges tightened, mislabels fixed, and spurious boxes removed. All final annotations carry |
| `score = 1.0`. |
| 4. **Splitting.** Splits are assigned by document, clustered by issue date to avoid |
| adjacent-day near-duplicate leakage, and stratified by template era so both structural |
| templates are represented in every split. Assignment is deterministic. |
|
|
| ## Limitations |
|
|
| - **Two structural templates.** The corpus spans two distinct bulletin layouts (a retail-only |
| 6-column table pre-May 2024, and a combined wholesale/retail 9-column table from May 2024 |
| onward). Both are represented in every split, though not in exactly proportional counts — |
| cluster integrity (no adjacent-day leakage) takes priority over exact proportionality. |
| - **Small scale.** 166 pages / 55 documents; suitable for fine-tuning and evaluation on this |
| document family, not as a general-purpose layout corpus. |
| - **Minority classes.** `Section-Header` and `Text` have substantially fewer boxes than the |
| other three classes, reflecting their genuine lower frequency per page (not every page has |
| a section header or footer text), rather than an annotation gap. |
|
|
| ## License |
|
|
| The **annotations** in this dataset (bounding boxes, class labels, and metadata) are released |
| under **CC BY-NC 4.0** — free to use for non-commercial research with attribution. The **page |
| images** are reproductions of bulletins published by ARDB; they are included for research use |
| only, and users are responsible for complying with the source documents' terms. This dataset is |
| not affiliated with or endorsed by ARDB. |
|
|
