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Ubuntu 20.04

sudo apt-get update

sudo apt install libopencv-dev python3-opencv

python3 -c “import cv2; print(cv2.__version__)”

sudo apt install tesseract-ocr

sudo apt install libtesseract-dev

tesseract --version

Windows

1. Install tesseract using windows installer available here.
2. Note the tesseract path from the installation. Default installation path at the time of this edit was: C:\Program Files\Tesseract-OCR\. It may change so please check the installation path. WARNING: Tesseract should be either installed in the directory which is suggested during the installation or in a new directory. The uninstaller removes the whole installation directory. If you installed Tesseract in an existing directory, that directory will be removed with all its subdirectories and files.
3. In cmd: pip install -r requirements.txt
4. Set the tesseract path in the script before calling image_to_string: pytesseract.pytesseract.tesseract_cmd = r'C:\Program Files\Tesseract-OCR\tesseract.exe'