史Historiographical Image Page Search (HI, U-Tokyo)
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Historiographical Image Page Search (HI, U-Tokyo)

Search the page-level image gallery of historiographical sources published by the Historiographical Institute, the University of Tokyo. Text data is generated with NDL OCR.

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Visualization

Ngram Viewer

Visualize the per-year frequency of OCR n-grams.

Visualize per-year frequencies of strings from NDL-OCR text. The top 5 results are shown by default.

  • Use slash (/) to compare multiple keywords. Example: 東大寺/興福寺
  • Regular expressions are supported. Example:平.盛清.寺(.+?)寺
  • We aggregate 1- to 5-gram strings that appear at least 6 times in the OCR.