About this site
Historiographical Image Page Search provides cross-collection search and browsing of the page images (han'men, 版面) of source collections compiled and published by the Historiographical Institute, the University of Tokyo. You can explore images from published collections such as Dai Nihon Shiryō and Dai Nihon Komonjo through full-text search, categories, a map, and an n-gram viewer.
What is included
The site covers the images of the Source-Page Gallery published by the Institute. Each page carries bibliographic metadata, so you can navigate by volume and page while inspecting the source image.
Text and search
To make the contents full-text searchable, the text for each page image is generated using the OCR of the National Diet Library (NDL). Because the text is produced by automatic recognition, errors and omissions can occur with hentaigana, cursive script, old-form characters, ruby, tables, and figures. A query may miss relevant pages, and the extracted text may differ from the original, so please treat the text as a finding aid and always check it against the page image.
Main features
- Search — full-text search over the OCR text; find the page images that match your keywords.
- Browse by category — reach a source through its collection series or classification.
- Browse by place — explore sources using place names and locations.
- Ngram Viewer — visualise how the frequency of a term changes, to get an overview of trends across the corpus.
Images and IIIF
The page images support IIIF (International Image Interoperability Framework), allowing high-resolution zoom as well as viewing and citation in any compatible viewer. OCR results can be overlaid on the original image in an annotated viewer.
Reuse and API
The search and n-gram features are also available as a programmatic API. See the API documentation for details. For the terms of use of the images and data, please follow the policy of the Historiographical Institute, which provides them.
Provided by
This site is provided by the Historiographical Institute, the University of Tokyo. For inquiries about the images and sources, please contact the Institute.