run-time error about missing functions, etc.

[SDSL]

Hi,
I need to build tesseract-ocr (https://code.google.com/p/tesseract-ocr/) from source in order to OCR some PDF files.  Many people use "convert" of imagemagick to first convert a PDF to a TIFF then resort to Tesseract to OCR the TIFF to a text file.

Since Tesseract depends on the Leptonica Image Processing Library (http://leptonica.com/), i had to build that from source as well.  Our OS distro is the old RHEL 6.2.  In our computing environment, most  utilities/tools are not installed at the typical locations (/usr/bin, /usr/local, etc.).   According to one of the README files, I don't need the JPEG/JPG & PNG headers/libs unless I need to write to a PDF so i did not yank them in (from our non-standard locations) while building Leptonica.  

When I fired off Tesseract as in
   /path/to/somewhere/install/tesseract-ocr_3.02.02/bin/tesseract  t.tiff  output
I got the following error message
   Tesseract Open Source OCR Engine v3.02.03 With Leptonica
   Error in findTiffCompression: function not present
   Error in pixReadStreamTiff: function not present
   Error in pixReadStream: tiff: no pix returned
   Error in pixRead: pix not read
   Unsupported image type

I am puzzled since the 2 missing functions are present in the shared lib according to my investigation below ...

From ldd of the Tesseract ELF binary:
   %  ldd  /path/to/somewhere/install/tesseract-ocr_3.02.02/bin/tesseract
   ...
   liblept.so.4 => /path/to/somewhere/install/Leptonica_1.71/lib/liblept.so.4 (0x00007fb10b4e6000)

And also the LD_LIBRARY_PATH setting (I know LD_LIBRARY_PATH is to be frowned upon but i only used it here as a temporary hack):
   %   echo $LD_LIBRARY_PATH
   /path/to/somewhere/install/tesseract-ocr_3.02.02/lib:/path/to/somewhere/install/Leptonica_1.71/lib

The 2 functions that appeared in the error output above, namely findTiffCompression & pixReadStreamTiff, DO EXIST in the share lib:
   %  nm -D /path/to/somewhere/install/Leptonica_1.71/lib/liblept.so.4  |  grep findTiffCompression
   00000000001a0140  T  findTiffCompression

   %  nm -D /path/to/somewhere/install/Leptonica_1.71/lib/liblept.so.4  |  grep pixReadStreamTiff
   00000000001a03e0  T  pixReadStreamTiff

What am I missing here?

Thanks for reading.

[zdenko podobny]

This is leptonica issue ;-)

Leptonica use stub/dummy file for not presented support[1]. So message "Error in pixReadStreamTiff: function not present" you should read as:"you did not compiled leptonica with (lib)tiff support you want to use it for reading tiff file"...

[1] https://tpgit.github.io/Leptonica/tiffiostub_8c_source.html

Zdenko

--
You received this message because you are subscribed to the Google Groups "tesseract-ocr" group.
To unsubscribe from this group and stop receiving emails from it, send an email to tesseract-oc...@googlegroups.com.
To post to this group, send email to tesser...@googlegroups.com.
Visit this group at http://groups.google.com/group/tesseract-ocr.
To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/90d8d0e8-ae7f-43af-8485-24826d78c10e%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.