tesseract-c_api-demo.py

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#!/usr/bin/python
# -*- coding: utf-8 -*-

# Copyright 2012 Zdenko Podobný
# Author: Zdenko Podobný
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""
Simple python demo script of tesseract-ocr 3.02 c-api
"""

import os
import sys
import ctypes

# Demo variables
lang = "eng"
filename = "../phototest.tif"
libpath = "/usr/local/lib64/"
libpath_w = "../vs2010/DLL_Release/"
TESSDATA_PREFIX = os.environ.get('TESSDATA_PREFIX')
if not TESSDATA_PREFIX:
    TESSDATA_PREFIX = "../"

if sys.platform == "win32":
        libname = libpath_w + "libtesseract302.dll"
        libname_alt = "libtesseract302.dll"
        os.environ["PATH"] += os.pathsep + libpath_w
else:
        libname = libpath + "libtesseract.so.3.0.2"
        libname_alt = "libtesseract.so.3"

try:
        tesseract = ctypes.cdll.LoadLibrary(libname)
except:
        try:
                tesseract = ctypes.cdll.LoadLibrary(libname_alt)
        except WindowsError, err:
                print("Trying to load '%s'..." % libname)
                print("Trying to load '%s'..." % libname_alt)
                print(err)
                exit(1)

tesseract.TessVersion.restype = ctypes.c_char_p
tesseract_version = tesseract.TessVersion()[:4]

# We need to check library version because libtesseract.so.3 is symlink
# and can point to other version than 3.02
if float(tesseract_version) < 3.02:
        print("Found tesseract-ocr library version %s." % tesseract_version)
        print("C-API is present only in version 3.02!")
        exit(2)

api = tesseract.TessBaseAPICreate()
rc = tesseract.TessBaseAPIInit3(api, TESSDATA_PREFIX, lang);
if (rc):
        tesseract.TessBaseAPIDelete(api)
        print("Could not initialize tesseract.\n")
        exit(3)

text_out = tesseract.TessBaseAPIProcessPages(api, filename, None , 0);
result_text = ctypes.string_at(text_out)
print result_text