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Re: TextRecognize tabular data

  • To: mathgroup at smc.vnet.net
  • Subject: [mg114185] Re: TextRecognize tabular data
  • From: telefunkenvf14 <rgorka at gmail.com>
  • Date: Fri, 26 Nov 2010 05:29:44 -0500 (EST)
  • References: <iciun9$lgu$1@smc.vnet.net>

On Nov 24, 5:59 am, Nate Dudenhoeffer <ndudenhoef... at gmail.com> wrote:
> I was just looking at some new functions in Mathematica 8, and found
> TextRecognize.  It is an OCR tool, and overall seems to work quite well.
>
> I would like to find a way to use it to get tabular data into a Mathematica
> list (even tabular data which may have columns of uneven length).   Any
> ideas on how to accomplish this?
>
> Thanks,
> Nate

1. Import and slice the image file into desired chunks using
ImagePartition[]. TextRecognize[#]&/@{your data to recognize, some
more data to recognize, and so on...} You may have to experiment with
scan resolutions to get the best result. Also, if you're data are
warped, due to sloppy copying/scanning this process will be a major
PITA. See point (3) below.

2. I've played around with TextRecognize (only in dev. versions, not
the final version 8 yet) and haven't been able to get consistent
results---even with good quality images. One trick I've found is that
preprocessing with MorphologicalBinarize[] can improve accuracy. (Try
a Manipulate[TextRecognize[MorphologicalBinarize[image,{a,b}]],.....]
or Manipulate[TextRecognize[MorphologicalBinarize[image,{b^5 &,
b}]],.....] and play with the parameters until you close in on
something that works best for a specific case.

3. If you have a large project, I'd recommend regular OCR software.
(especially if the images need to be straightened or cleaned up prior
to OCRing)

-RG


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