OpenCV

Installation

Verwende Python3 als Standard:

sudo apt-get install python-is-python3

Evtl python2 entfernen (noch nicht gemacht): https://askubuntu.com/questions/1242702/how-to-remove-python-2-from-ubuntu-20-04

pip3

sudo apt install python3-pip
sudo update-alternatives --install /usr/bin/pip pip /usr/bin/pip3 1

update pip (als normaler User):

pip install -U pip

OCR https://www.geeksforgeeks.org/license-plate-recognition-with-opencv-and-tesseract-ocr/?ref=lbp

pip install pytesseract
pip install opencv-python
sudo apt-get install tesseract-ocr tesseract-ocr-deu 

cd ~/Software/OpenCV/detecting-and-ocring-digits
python ocr_digits.py --image apple_support.png

display_ocr

https://github.com/arturaugusto/display_ocr

Nice programm to change OCR parameters and see the effect immediately. (Slider for "Filter" not used in code ...)

Copied letsgodigital.traineddata to /usr/share/tesseract-ocr/4.00/tessdata/ for global use.

Added some image manipulation functions. Needs fine tuned parameters to recognize my LCD photo! Screenshot:

gImageReader

https://wiki.ubuntuusers.de/gImageReader/

Screenshot: Working pretty well when cropping the right section manually :-)

tesseract

See shell script test1/espcam_ocr.sh, reading all pic*.jpg from assets.

As well as the pictures seem to be pretty comparable, the results are heavily different...