Tesseract-OCR giving different results for same image on different systems.

adesh gautam

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Dec 16, 2019, 7:28:37 AM12/16/19

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Hi,

I am using tesseract-ocr on my images, and i am getting different results by running tesseract on different systems for same image.

I am using pytesseract library.

I am setting the following parameters:

--psm 6 -c classify_enable_learning=0 -c classify_enable_adaptive_matcher=0

Images have dpi=300.

Tesseract version:

tesseract v5.0.0-alpha.20191030
leptonica-1.78.0
libgif 5.1.4 : libjpeg 8d (libjpeg-turbo 1.5.3) : libpng 1.6.34 : libtiff 4.0.9 : zlib 1.2.11 : libwebp 0.6.1 : libopenjp2 2.3.0
Found AVX2
Found AVX
Found FMA
Found SSE
Found libarchive 3.3.2 zlib/1.2.11 liblzma/5.2.3 bz2lib/1.0.6 liblz4/1.7.5

OS:

Windows 10

Are there any system specific optimizations/dependencies by tesseract ?

Shree Devi Kumar

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Dec 16, 2019, 8:16:26 AM12/16/19

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Run tesseract --version on the different systems.

Are thetraineddata files being used on the different systems the same?

Share an image and the different output received in each case.

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adesh gautam

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Dec 16, 2019, 10:36:08 AM12/16/19

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There is the same version of tesseract on the two systems as i mentioned before.

The trained data is also same, eng.traineddata

These are the two images.

a.jpg

b.jpg

And these are the outputs for the same images on different systems.

System 1

a.jpg

['(A', '1, oy OFW ID CARD 2', 'Repubic of the Plasppines', 'o WJ, Department of Laor and Empioyment )', '(SSRee) Philippine Oversans Employment Admievstraticn,', 'ee ——', 'MARIA SANTOS DELA CRUZ', 'rn', '20911483', 'orion, 10', 'inde [0p {0)]', 'os', 'isle =', 'TUTTI ARG COMPANY [EI', 'dune 20, 2010']

b.jpg

['INTERNATIONAL STUDENT TY', 'EE', 'Ng ome']

System 2

a.jpg

['(~~', '% oy OFW ID CARD L', 'Nepubse of the Preappinas', '4 wi. Department of Labor and Employment »', 'Soe ac Pruippine Oversaas Employment Adminvstraion,', 'fp', 'MARIA SANTOS DELA CRUZ', 'si00an', '29911483', 'emt, 84', 'ine 1} 4 10)', 'mt', 'Mein Drbitue Bcd', '“werraci —ABo coMPany Oat', 'Si vue 90, 2010']

b.jpg

['DCL ae Pcl', 'R) arc orn', 'PN secret']

The output is different.

Is it normal for tesseract ?

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Shree Devi Kumar

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Dec 17, 2019, 2:17:28 AM12/17/19

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Please check file sizes for eng.traineddata - they maybe different versions even though they are called the same.

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adesh gautam

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Dec 17, 2019, 2:38:45 AM12/17/19

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The file size of eng.traineddata is same - 3.92MB.

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Shree Devi Kumar

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Dec 17, 2019, 11:06:16 AM12/17/19

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>There is the same version of tesseract on the two systems as i mentioned before.

OK. But is there any difference in specs of the 2 systems in terms of AVX etc. Hence tesseract -v would be useful.

Also, just check the results via CLI.

I get different results when using eng.traineddata from tessdata_best and tessdata_fast

ubuntu@tesseract-ocr:~/TEST$ tesseract unnamed.png - --tessdata-dir ~/tessdata_fast
Warning: Invalid resolution 0 dpi. Using 70 instead.
Estimating resolution as 195
OFW ID CARD

Republe of the Pieippings *
Department of Labor and Employment ae
Phiipploe Overseas Employment Admieistration,

MARIA SANTOS DELA CRUZ
29911483
‘enh

x Sess)

GIDE
ubuntu@tesseract-ocr:~/TEST$ tesseract unnamed.png - --tessdata-dir ~/tessdata_best
Warning: Invalid resolution 0 dpi. Using 70 instead.
Estimating resolution as 195
OFW ID CARD

Ropubkc of he Pisppines
Department of Labor and Employment "a
Phiipplaa Overseas Employment Admieistration

MARIA SANTOS DELA CRUZ
29911483
rn ve

hI [Op410)

[EI

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adesh gautam

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Dec 19, 2019, 5:41:17 AM12/19/19

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Both AVX and AVX2 are enabled on both the systems.

I am not using specific tessdata_fast or tessdata_best. I am using the default eng.traineddata that comes with windows installer.

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