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--- |
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license: mit |
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language: |
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- ru |
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tags: |
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- ocr |
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--- |
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## Basic Description |
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Dataset contains source images and human-readable extracted texts. All texts were published in Russia in the 19th century and written using pre-reform orthography. |
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The dataset is designed to train and evaluate optical character recognition systems for texts published in Russian before the orthographic reform (1917). |
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## Data structure |
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For each text there is a file with its image and the text corresponding to this image. The names of these files are the same except for the extension or suffix `_image` and `_text` respectively. The images are placed in either pdf or png files. The texts are contained in files with the extension `txt`. For example: |
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* `afanasjev-chuzhbinskij_a_s.peterburgskie_igroki.pdf` |
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* `afanasjev-chuzhbinskij_a_s.peterburgskie_igroki.txt` |
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Or: |
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* `300_page_image_009.png` |
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* `300_page_text_009.txt` |
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Long texts (mostly novels) are presented in `pdf`. They can be found in the `pdf` subfolder inside the `books-pdf-plaintext` folder. The neighboring `txt` subfolder contains their corresponding texts. |
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Short texts of one-page length are in the `pages-img-plaintext` folder, where images are in `png` format. |
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## The specifics of the old orthography |
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Old orthography differs from modern orthography in that it contains 4 letters that were removed from the Russian alphabet after the reform, as well as a set of later abolished specific rules for spelling words. |
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These letters and rules are taken into account in a special package for Python, which is designed to convert text from the old orthography to the new one: [prereform2modern](https://pypi.org/project/prereform2modern/). |
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## Examples |
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### Image |
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### Corresponding text |
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7 |
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вамъ это происшествіе со всѣми должными приправами: съ непритворнымъ ужасомъ на лицѣ, въ глазахъ; съ содроганіемъ; съ восклицаніями и, наконецъ, съ поднятіемъ рукъ къ Небу!… Вы увидите какъ это послѣднее тѣлодвиженіе картинно въ немъ.» |
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«Не слишкомъ ли много чести, отецъ ректоръ, для жидовскаго раввина, что вы удостоиваете смѣяться надъ нимъ?» |
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«Кто вамъ сказалъ, что я смѣюсь надъ нимъ? вотъ увидите сами; пошлите завтра къ нему сказать, чтобъ пришелъ къ вамъ; онъ явится тотчасъ и тогда просто скажите ему, что вамъ любопытно знать для чего всѣ двѣнадцать деревень названы однимъ |
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## Acknowledgements |
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Dataset was formed thanks to the organizational help of Alexey V. Vdovin. |
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