Kotomiya07/kuzushiji-dataset-coco

Kuzushiji Dataset (COCO format)

This dataset contains page images from historical Japanese documents (Kotenseki) with character-level bounding box annotations for Kuzushiji (cursive Japanese) recognition.

Dataset Structure

{
    "image": Image(),                    # Page image
    "image_id": str,                     # Image ID (e.g., 100241706_00004_2)
    "book_id": str,                      # Book ID (e.g., 100241706)
    "width": int,                        # Image width in pixels
    "height": int,                       # Image height in pixels
    "objects": {
        "bbox": List[List[float]],       # Bounding boxes ([x_min, y_min, width, height] (pixels))
        "category": List[str],           # Unicode strings (e.g., U+3042)
        "category_id": List[int],        # Category IDs
        "char": List[str],               # Actual characters (e.g., あ)
    }
}

Bounding Box Formats

Format	Description	Normalized
COCO	[x_min, y_min, width, height]	No (pixels)

Usage

from datasets import load_dataset

dataset = load_dataset("your-username/kuzushiji-dataset-coco")

# Access first example
example = dataset["train"][0]
print(f"Image ID: {example['image_id']}")
print(f"Number of characters: {len(example['objects']['bbox'])}")

License

This dataset is licensed under CC BY-SA 4.0.

Data Source

This dataset is derived from the 日本古典籍くずし字データセット (Japanese Historical Character Dataset).

• Provider: National Institute of Japanese Literature and other institutions (国文学研究資料館ほか所蔵)
• Processing: ROIS-DS Center for Open Data in the Humanities (CODH)
• DOI: 10.20676/00000340
• Website: https://codh.rois.ac.jp/char-shape/

Citation

If you use this dataset, please cite:

『日本古典籍くずし字データセット』（国文研ほか所蔵／CODH加工）doi:10.20676/00000340

English:

"Japanese Historical Character Dataset" (Owned by NIJL and others, Processed by CODH) doi:10.20676/00000340

Acknowledgments

Data provided by: ROIS-DS Center for Open Data in the Humanities (人文学オープンデータ共同利用センター)