Initializing tesseract with TessBaseAPIInit4 from python

[Guru Govindan]

Hi There,

I recently migrated to tesseract 4 and tried pytesseract. But that is too slow for the kind of application I am creating.

I wanted to write my own python wrapper that would use the tesseract.so.4 directly. 

I saw the example on the github page for the same (https://github.com/tesseract-ocr/tesseract/wiki/APIExample)

But I have issues initializing TessBaseAPIInit4().

I have multiple variables that I want to set and it keeps getting segmentation fault.

I am not sure what I am doing wrong. I also tried the C++ version of it. 

Please let me know if it is a known problem.

import os
from ctypes import *


lang = "eng"
filename = "/data/framecache/testing.jpg"
libname = "/usr/local/lib/libtesseract.so.4"


TESSDATA_PREFIX = os.environ.get('TESSDATA_PREFIX')
if not TESSDATA_PREFIX:
  TESSDATA_PREFIX = "/home/vagrant/reelz_base/shared/tessdata"


print "TESSDATA_PREFIX={}".format(TESSDATA_PREFIX)


tesseract = cdll.LoadLibrary(libname)
tesseract.TessVersion.restype = c_char_p
tesseract_version = tesseract.TessVersion()




api = tesseract.TessBaseAPICreate()
print api


vars_vec = ["tesseract_char_whitelist",
            "tessedit_pageseg_mode",
            "image_default_resolution"]


vars_values = ["ABCDEFGHIJKLMNOPQRSTUVWXYZ",
               "6",
               "70"]




vec_arr_type = c_char_p * len(vars_vec)
vars_vec_arr = vec_arr_type()
for i, val in enumerate(vars_vec):
  vars_vec_arr[i] = val


print "vars_vec_arr={}".format(vars_vec_arr)


val_arr_type = c_char_p * len(vars_values)
vars_val_arr = val_arr_type()


for i, val in enumerate(vars_values):
  vars_val_arr[i] = val


print "vars_val_arr={}".format(vars_val_arr)






rc = tesseract.TessBaseAPIInit4(api, TESSDATA_PREFIX, lang , 2, None, 0, vars_vec_arr, vars_val_arr, 0, c_bool(False))

[Shree Devi Kumar]

See https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!searchin/tesseract-ocr/zdenko%7Csort:date/tesseract-ocr/xvTFjYCDRQU/SI6du-4JBAAJ

Example how to use tessseract C-API in python with cffi  

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[Guru Govindan]

Thanks a lot Shree. I will try it tonight.

Best regards,

Guru

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