Exception while using tesseract with CentOS Linux

[Swapnil Paithankar]

Hi,

I am getting an exception when I am trying to use tesseract with linux(CentOS version 7 (core)) as follows- 

System.DllNotFoundException: Failed to find library "liblept1753.so" for platform x64. 

I am having hard time solving this. Any help would be appreciated.

Thanks

[Lakshay Saini]

Hi Swapnil,

Most probably, the problem persists in the location of the liblept.so file.

In my system (CentOS 7), I had the same problem because the code was trying to find liblept.so file, but I had liblept.so.5.0.2.

So, to solve it, I changed the following code inside the "leptonica.py"

lept = ffi.dlopen(find_library('lept'))

to:

lept = ffi.dlopen(find_library('/usr/local/lib/liblept.so.5.0.2')) (The actual path of the lib.)

Regards,

Lakshay Saini

[Lorenzo Bolzani]

Hi,

leptonica is a little strange about versions. For example leptonica 1.76 means library version 5.

The library I use is liblept.so.5 under /usr/local/lib/, /usr/lib/x86_64-linux-gnu/  (with Mint 19, Ubuntu based)

I suppose you already have this if you correctly installed leptonica. You can check this with:

ldconfig -p | grep lept

So I suppose you just need to replace the "1753" somewhere with a "5" so that it looks for this file (if you are compiling something). Or create a symlink to liblept1753.so (I wouldn't do this unless really necessary).

You can try:

ldd /usr/local/bin/tesseract

(change the path to your tesseract executable if different) to see what libraries the executable is actually looking for. If it wants liblept1753.so you need to find a package with this file or use a symlink.

Lorenzo

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