license-plate-recognition | OpenCV digital image processing course design homework [ | Data Manipulation library

Try to put the destroyAllWindows in a loop to close it properly (pressing q):

You may try different psm configuration:

pytesseract is only a binding for tesseract-ocr for Python. So, if you want to use tesseract-ocr in python code without using subprocess or os module for running command line tesseract-ocr commands, then you use pytesseract. But, in order to use it, you have to have a tesseract-ocr installed.

You can think of it this way. You need a tesseract-ocr installed because it's the program that actually runs and does the OCR. But, if you want to run it from python code as a function, you install pytesseract package that enables you to do that. So when you run pytesseract.image_to_string(Image.open('test-european.jpg'), lang='fra'), it calls the tesseract-ocr with the provided arguments. The results are the same as running tesseract test-european.jpg -l fra. So, you get the ability to call that from the code, but in the end, it still has to run the tesseract-ocr to do the actual OCR.