Using Tesseract 4 in Windows

Question

I am struggle to use tesseract ocr in windows. Here is what I have installed: tesseract-ocr-w32-setup-v4.0.0-rc1.20181002.exe from here:

https://github.com/UB-Mannheim/tesseract/wiki

and I have installed on my machine. After that, I have setup the environment variable

but when I am trying to get text from image, with this command:

C:\Users\flaviu.marc>tesseract c:\Flaviu\imagine.png C:\Flaviu\output.txt

I get the following errors:

Error opening data file C:\Program Files (x86)\Tesseract-OCR\eng.traineddata
Please make sure the TESSDATA_PREFIX environment variable is set to your "tessdata" directory.
Failed loading language 'eng'
Tesseract couldn't load any languages!
Could not initialize tesseract.

Can you help me to solve my problem ? I am trying to use tesseract into VC++ app, but I get exactly the same errors just like I use tesseract from command line.

After I updated the environment variable:

I get the following error:

C:\Users\flaviu.marc>tesseract c:\Flaviu\imagine.png C:\Flaviu\output.txt
Tesseract Open Source OCR Engine vv4.0.0-rc1.20181002 with Leptonica
Error in pixReadStreamPng: spp == 1, cmap, trans array, invalid depth: 4

Later edit: if I have tried another image, the initialization is working now, but I still have some error messages:

Error in pixReadMemTiff: function not present
Error in pixReadMem: tiff: no pix returned
Error in pixaGenerateFontFromString: pix not made
Error in bmfCreate: font pixa not made

Why I encounter these errors ? Because when I try to run the classic code (pImage is NULL)

Pix* pImage = pixRead(sFileName);
if(NULL == pImage)
{
    m_sError.Format(_T("Could not read image with leptonica."));
    return sRet;
}

Code is taken from here: https://github.com/tesseract-ocr/tesseract/wiki/APIExample

Here is how I compiled leptonica:

how can compile libtiff ? I have no option for that ...

Check out this short but working tutorial on tesseract : youtu.be/2fmzooBKp8A — ObliteratedJillo
– ObliteratedJillo, Commented Aug 19, 2021 at 3:45

Dmitrii Z. · Accepted Answer · 2018-10-08 11:22:38Z

1

TESSDATA_PREFIX should be pointing to the directory with traineddata files for example:

tessdata default

tessdata good quality but slow

tessdata fast but lower quality

answered Oct 8, 2018 at 11:22

Dmitrii Z.

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6 Comments

Flaviu_ Over a year ago

I updated the answer. I pass by from initial error though.

Dmitrii Z. Over a year ago

That error means that something is wrong with your image. Try to run tesseract on another image.

Dmitrii Z. Over a year ago

I would suggest you to make another question regarding your last errors. In that case leptonica experts would more likely see the questions and would be able to help. Also it would help other users with similar problem, because question name would better describe the issue you have.

Dmitrii Z. Over a year ago

But at first glance it looks like leptonica was built without libtiff

Flaviu_ Over a year ago

I don't think I had this option (to compile or not libtiff), nor in leptonica nor in tesseract ...

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