ocropus-dewarp

#!/usr/bin/env python

from __future__ import print_function

import re
import argparse
import sys

import numpy as np
from scipy.misc import imsave

import ocrolib
from ocrolib import lineest

np.seterr(divide='raise',over='raise',invalid='raise',under='ignore')

parser = argparse.ArgumentParser("dewarp lines as used for the recognizer")

parser.add_argument("-e","--lineest",default="center",
                    help="type of text line estimator, default: %(default)s")
parser.add_argument("-l","--height",default=48,type=int,
                    help="set the default height for line estimation, default: %(default)s")


parser.add_argument("files",nargs="*")
args = parser.parse_args()

inputs = ocrolib.glob_all(args.files)
if len(inputs)==0:
    parser.print_help()
    sys.exit(0)

print("# inputs", len(inputs))

if args.lineest=="center":
    lnorm = lineest.CenterNormalizer()
else:
    raise Exception(args.lineest+": unknown line normalizer")

lnorm.setHeight(args.height)

for fname in inputs:
    print("#", fname)
    base,_ = ocrolib.allsplitext(fname)
    try:
        line = ocrolib.read_image_gray(fname)
        lnorm.measure(np.amax(line)-line)
        line = lnorm.normalize(line,cval=np.amax(line))
        imsave(base+".dew.png",line)
    except Exception as e:
        print("ERROR", e)
        continue