generate_wordstr_box.py

#!/usr/bin/env python3

import argparse
import io
import unicodedata

import bidi.algorithm
from PIL import Image

#
# command line arguments
#
arg_parser = argparse.ArgumentParser(
    """Creates tesseract WordStr box files for given (line) image text pairs"""
)

# Text ground truth
arg_parser.add_argument(
    '-t',
    '--txt',
    nargs='?',
    metavar='TXT',
    help='Line text (GT)',
    required=True,
)

# Image file
arg_parser.add_argument(
    '-i',
    '--image',
    nargs='?',
    metavar='IMAGE',
    help='Image file',
    required=True,
)

args = arg_parser.parse_args()

#
# main
#

# load image
with open(args.image, 'rb') as f:
    im = Image.open(f)
    width, height = im.size

# load gt
with io.open(args.txt, 'r', encoding='utf-8') as f:
    lines = f.read().strip().split('\n')
    if len(lines) != 1:
        raise ValueError(
            'ERROR: %s: Ground truth text file should contain exactly one line, not %s'
            % (args.txt, len(lines))
        )
    line = unicodedata.normalize('NFC', lines[0].strip())

# create WordStr line boxes for Indic & RTL
if line:
    line = bidi.algorithm.get_display(line)
    print('WordStr 0 0 %d %d 0 #%s' % (width, height, line))
    print('\t 0 0 %d %d 0' % (width, height))