Open Source Document Management System | OpenKM

PostPosted:**Wed Apr 13, 2011 2:47 pm**

OpenKM 5.0.3 (build: 5159) on Ubuntu server
tesseract 3
imagemagick 6.6.2.6-1ubuntu1.1

Running tesseract from the terminal I'm able to OCR a Tiff file without any problems, but when I upload the same document on OKM the document does not get processed. This what I get on my log file:

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2011-04-13 15:06:05,607 DEBUG [com.openkm.extractor.TiffTextExtractor] CMD: convert -depth 8 -monochrome /tmp/okm2222865511775852701.tif /tmp/okm8301523301139778998.tif
2011-04-13 15:06:05,797 DEBUG [com.openkm.extractor.TiffTextExtractor] CMD: convert -depth 8 -monochrome /tmp/okm2134408032814981524.tif /tmp/okm7437339512715843922.tif
2011-04-13 15:06:08,968 DEBUG [com.openkm.extractor.TiffTextExtractor] CMD: /usr/bin/tesseract /tmp/okm7437339512715843922.tif /tmp/okm998230814336069662
2011-04-13 15:06:08,969 DEBUG [com.openkm.extractor.TiffTextExtractor] CMD: /usr/bin/tesseract /tmp/okm8301523301139778998.tif /tmp/okm1392151765958597643
2011-04-13 15:06:09,216 DEBUG [com.openkm.extractor.TiffTextExtractor] TEXT: 
2011-04-13 15:06:09,338 DEBUG [com.openkm.extractor.TiffTextExtractor] TEXT: 
2011-04-13 15:06:09,362 INFO  [org.apache.jackrabbit.core.query.lucene.MultiIndex] updating index with 1 nodes from indexing queue.

The command convert -depth 8 -monochrome gets called first then tesseract gets issued for OCR, now testing the convert command from the terminal (also with the same tiff file) I get this error:

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> /usr/bin/convert -depth 8 -monochrome /root/file.tif /tmp/filenew.tif
convert: Bits/sample must be 1 for Group 3/4 encoding/decoding. `/tmp/filenew.tif' @ warning/tiff.c/TIFFErrors/494.

any ideas as to what's causing this?? I've checked for any missing libraries but for what I can see everything looks in order.

PostPosted:**Wed Apr 13, 2011 3:31 pm**

convert only seems to work with the depth set to 1

/usr/bin/convert -depth 1 -monochrome /root/file.tif /tmp/filenew.tif

file.tif-depth1.png (33.3 KiB) Viewed 3674 times

PostPosted:**Wed Apr 20, 2011 7:15 am**

In our testing 8 bits depth is working fine. Perhaps is anything related to a concrete TIFF file or the problems is with many others? Can you attach here a sample TIFF to test?

PostPosted:**Wed Apr 20, 2011 11:59 am**

thanks pavila,
our scanner produces tiff format documents with group 3/4 compression, i've attached a sample for you to look at.

PostPosted:**Fri Apr 22, 2011 7:09 am**

The TIFF has some problems:

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TIFFReadDirectory: Warning, 20110420_185355.tif: invalid TIFF directory; tags are not sorted in ascending order.
TIFFReadDirectory: Warning, 20110420_185355.tif: unknown field with tag 32931 (0x80a3) encountered.
TIFFReadDirectory: Warning, 20110420_185355.tif: unknown field with tag 32934 (0x80a6) encountered.

But the OCR text extraction works fine. You have several options:

Fix the TIFF problems
Download the source code and comment the call to ImageMagick convert, and compile it.
Create a dummy "convert" which only copy the input file to the output without any modification
Wait until the next week and test the new OpenKM major release (actually there is no document upgrade)

Open Source Document Management System | OpenKM

OCR issues - convert pre-process not working

OCR issues - convert pre-process not working

Re: OCR issues - convert pre-process not working

Re: OCR issues - convert pre-process not working

Re: OCR issues - convert pre-process not working

Re: OCR issues - convert pre-process not working