OCR 02: Tesseract-OCR

Catalog

• OCR 01: EasyOCR
• OCR 02: Tesseract-OCR
• OCR 03: PaddleOCR

Project Host And Brief

• Official Site: https://tesseract-ocr.github.io/
• GitHub Repository: https://github.com/tesseract-ocr/tesseract

Tesseract Windows Release

Link: https://github.com/UB-Mannheim/tesseract
Download: https://digi.bib.uni-mannheim.de/tesseract/

Installation

Windows

The installation size is small

1. Download w64 binary from https://github.com/UB-Mannheim/tesseract/wiki
2. Run it, and check the Chinese language traineddata during the install process.

Ubuntu

TBD

Usage

"C:\Program Files\Tesseract-OCR\tesseract.exe" fp01.jpg result_fp01 -l chi_sim

Performance

• Run on CPU, Speed is much faster than EasyOCR
• The correct rate is a little bit higher than EasyOCR, while the situation is almost the same, text can hardly be read when handling with the photos taken by a cellphone

Improving the quality of the output

Link: https://tesseract-ocr.github.io/tessdoc/ImproveQuality.html

Image processing

• Rescaling
• Binarisation
• Noise Removal
• Dilation / Erosion
• Rotation / Deskewing
• Borders
• Transparency / Alpha channel
• Tools / Libraries
• Examples
• Tables recognitions
• Page segmentation method
• Dictionaries, word lists, and patterns