user-patterns Segmentation fault

[Christopher Smeenk]

I would like to use tesseract to read data from a scanned high school transcript. The form contains a bunch of fields (student name, gender, address) and corresponding values (characters, words or numbers).

I understand the way to do this is using config files augmented with user data [see the man page,  patterns are explained in more detail in the file /path/to/tesseract-ocr/dict/trie.h].

However, when I try to set my own eng.user-words or eng.user-patterns, tesseract returns a Segmentation Fault.

First, here is a test image I am using to check the pattern matching: (attached file test-002.png)

Here is some info about my install:

cs@pleco:/data/OCR/tesseract/tests$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04.4 LTS
Release: 12.04
Codename: precise

cs@pleco:/data/OCR/tesseract/tests$ tesseract -v
tesseract 3.02.02
 leptonica-1.69
  libjpeg 6b : libpng 1.2.46 : libtiff 3.9.5 : zlib 1.2.3.4

Here's is a good run, showing the output:

cs@pleco:/data/OCR/tesseract/tests$ tesseract testImages/test-002.png thetext -psm 3
Tesseract Open Source OCR Engine v3.02.02 with Leptonica
cs@pleco:/data/OCR/tesseract/tests$ cat thetext.txt
Na me: Roosevelt, Fra nklin


Age: 102


Name: Harper, Stephen
Age: 58


Name: Hawk, Tony
Age: 34


Nane: Shakespeare, Bill
Age: 432

Here are the config file and user pattern files:

cs@pleco:/usr/share/tesseract-ocr/tessdata$ cat configs/bazaar_test 

load_system_dawg F

load_freq_dawg F

user_words_suffix test-words

user_patterns_suffix test-patterns

cs@pleco:/usr/share/tesseract-ocr/tessdata$ cat eng.test-patterns 

Name: \A\c*, \A\c*

Age: \d*

cs@pleco:/usr/share/tesseract-ocr/tessdata$ cat eng.test-words 

Name:

Age:

Roosevelt

Franklin

Harper

Stephen

Hawk

Tony

Shakespeare

And here is the result when running tesseract with the config file:

cs@pleco:/data/OCR/tesseract/tests$ tesseract testImages/test-002.png thetext -psm 3 bazaar_test
Tesseract Open Source OCR Engine v3.02.02 with Leptonica
Segmentation fault

What am I doing wrong? Thanks for reading!

Chris

[zdenko podobny]

Hi,

I tried it in 3.03 version (on openSUSE 13.1) and there was no segfault (3.02 segfault also for me).

Zdenko

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[Christopher Smeenk]

Thank you Zdenko. I can confirm v3.03 works with no segfault on my system too.

I am still having trouble to use the user-patterns and user-words files to control the output from tesseract v3.03. I will start another thread about this.

Chris