What preprocessing operations are performed by Tesseract OCR? -

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i couldn't find detailed documentation , don't feel browsing source code. want not redo canny edge detection example if done tesseract engine.

this document provides overview of engine: https://github.com/tesseract-ocr/docs/blob/master/tesseracticdar2007.pdf

so looks don't need implement canny edge detection.

tesseract uses otsu thresholding binarize image before processing https://github.com/tesseract-ocr/tesseract/blob/master/ccstruct/otsuthr.h

edit: if want see binarized image create new config file in "\tessdata\configs\", add line: tessedit_write_images true , process image: tesseract your_image out your_config_file. tesseract saves binarized image tessinput.tif.


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