grey_and_binarize.py

#!/usr/bin/env python3
import cv2
import argparse

if __name__ == "__main__":

    parser = argparse.ArgumentParser(description='Pre-process for OCR')
    parser.add_argument('input', help='Name of original image')
    parser.add_argument('output', help='Name of output image')
    args = parser.parse_args() 

    img = cv2.imread(args.input)
    h, s, grau_img = cv2.split(cv2.cvtColor(img, cv2.COLOR_BGR2HSV))

    
    cv2.imwrite(args.output, grau_img)

    # Binarisierung
    ret, bi_img = cv2.threshold(grau_img, 0, 255, cv2.THRESH_BINARY+cv2.THRESH_OTSU)
    res_name2 = 'Binarized' + args.output
    cv2.imwrite(res_name2, bi_img)