I want to find a generalized method that can help me improve accuracy of OCR output. I have tried several methods in OpenCV i.e binary thersholding, adaptive thresholding, blurring, closing etc. After pre processing I get good results for one template but the accuracy for another template decreases. Hence I want to preprocess all templates using one method that can give me 90 to 95 percent accuracy.
The images I am trying to process are here.
OCR used is pytesserect.