Is ChoiceIterator implemented in the wrapper?

[ArtGardner]

This is about ChoiceIterator, as in this reference:

https://code.google.com/p/tesseract-ocr/wiki/APIExample#Example_of_iterator_over_the_classifier_choices_for_a_single_sym

I can find no mention of it in the wrapper source, nor in these discussions. Is someone working on it?

Actually, it's not clear that this class is in libtesseract302.dll either, just based on scanning the symbols with depends22.

[charlesw]

From memory this functionality wasn't exposed through the CAPI in version
3.02 which is why I haven't been able to expose it. I'll have another look
into this over the weekend and let you know what I find out.
On 30 Oct 2014 01:25, "ArtGardner" notifications@github.com wrote:

I'm referring to alternative choices for a single symbol, please see:

https://code.google.com/p/tesseract-ocr/wiki/APIExample#Example_of_iterator_over_the_classifier_choices_for_a_single_sym

I can find no mention of it in the wrapper source, nor in these
discussions. Is someone working on it?

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#129.

[ArtGardner]

Awesome, thanks!

[charlesw]

I've checked out the source in 3.04 (master branch) and this functionality
is not currently exposed. I'll see if I can get it added however this will
have to wait till the official 3.04 release of tesseract.

On 4 Nov 2014 01:46, "ArtGardner" notifications@github.com wrote:

Awesome, thanks!

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#129 (comment).

[ArtGardner]

Fair enough, thanks again. For my own understanding, what was I looking at via the above link? At the top of the page, I see "This wiki provide simple example how to use tesseract-ocr API (v3.02.02) in C++". Are there multiple CAPI's for tesseract?

[charlesw]

No there's only one CAPI, however there is also a C++ API which is what the
sample you mentioned uses.

[ArtGardner]

That clears it up. Thanks again!

[charlesw]

FYI, this functionality has since been added to the capi. So should be able to add support for this ince Tesseract 3.04 is released.

[ddobrev]

Hello. I'd like to ask about any news on ChoiceIterator.

[charlesw]

Sorry still waiting on official 3.04 release of Tesseract.

[ddobrev]

@charlesw I need it right now so I compiled Tesseract 3.04 from source. I want to try wrapping ChoiceIterator myself so could you please give me some hints? Do I need to wrap it manually or do you use a generator?

[charlesw]

Hi Dimitar, you best bet would be to mirror the current result iterator
only returning the various choices instead of results. In general you'll
need to do the folling:

• Declare the functions in the TesseractAPI interface that correspond to
  the caoi functions for the iterator
• Create a wrapper class that takes the choice iterators handle and
  destroys the iterator on disposal
  Note that none of these builds are supported and I don't believe that all
  the Tesseract languages for 3.04 have been trained/generated yet which may
  be a problem for you, though I could be mistaken about that.

Feel free to submit a pull request with your changes :)

@charlesw https://github.com/charlesw I need it right now so I compiled
Tesseract 3.04 from source. I want to try wrapping ChoiceIterator myself so
could you please give me some hints? Do I need to wrap it manually or do
you use a generator?

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#129 (comment).

[jhuntsman]

Hi, I needed this also, so I compiled the latest tesseract 3.04 to use to add the wrapper. I created a fork and branch here: https://github.com/jhuntsman/tesseract/tree/feature_3.04/choice-iterator, you are welcome to it if it helps.

[charlesw]

Great, would you be able to create a pull request so I can merge your changes?

[jhuntsman]

@charlesw Absolutely I will do that. I cleaned things up and also used your Dev_3.0.3 branch as my base so as not to conflict since it does depend on 3.03+. Pull request is forthcoming

[charlesw]

Merged fix, thanks