Hello,
Yep that is exactly what I do; we read a predefined format so
I limit it to captial letters, digits and the < character. It speeds
up the reading and removes a lot of the rubbish.
Cheers,
Neil
On 19 April 2010 01:00, zdenko podobny <zde...@gmail.com> wrote:
> Hello,
>
> if I correctly understood "Comment by ffournel, Mar 30, 2010" on
> http://code.google.com/p/tesseract-ocr/wiki/FAQ we can achieved the same
> behavior by creating config file (e.g. digits in directory
> tessdata/configs/) with line:
>
> tessedit_char_whitelist 0123456789
>
> and than to run:
>
> C:>tesseract.exe nine.tif out tessdata/configs/nobatch
> tessdata/configs/digits
>
> Zd
>
> On Sun, Apr 18, 2010 at 7:50 PM, MARTIN Pierre <hicksc...@gmail.com> wrote:
>>
>> Dear NGuyenQ,
>>
>> From the page http://www.pixel-technology.com/freeware/tessnet2/
>> tessnet2.Tesseract ocr = new tessnet2.Tesseract();
>> ocr.SetVariable("tessedit_char_whitelist", "0123456789"); // If digit only
>>
>> This is brilliant advice you just gave him. It is very effective, i just
>> tested it on document with only digits and a few special characters.
>> Since i'm working with C++ only (No .net wrapper), here is what i
>> recommend to do:
>> // Init your tess API.
>> _tessApi = new tesseract::TessBaseAPI();
>> // Set up the current directory and language prefix.
>> _tessApi->Init("./", "cst");
>> // This is only important if you'll be parsing pictures with only one line
>> of text (Which is my case).
>> _tessApi->SetPageSegMode(tesseract::PSM_SINGLE_LINE);
>> // Here is the trick as explained and pointed by NGuyenQ:
>> _tessApi->SetVariable("tessedit_char_whitelist", "<0123456789");
>> // The in a loop for each of my documents, here is the idea:
>> PIX *pix = pixReadMemTiff((const l_uint8*)buffer.buffer().constData(),
>> buffer.size(), 0);
>> _tessApi->SetImage(pix);
>> doc.setRecognizedData("OCRLine", QString(text).trimmed());
>> pixDestroy(&pix);
>> delete [] text;
>> delete pix;
>> // Release everything.
>> _tessApi->Clear();
>> _tessApi->End();
>> delete _tessApi;
>> The very very interesting part is that before, i was getting "D" and "O"
>> instead of zeros, sometimes even "A" for "4" and "[]" and "[)" instead of
>> zeroes, despite my disambiguation file. Now, i'm getting everything correct,
>> which means the whitelist / blacklist are not just post-processing filters,
>> but real "recognition clues".
>> i recommend everyone to take note (Well... i'm discovering this feature
>> and it's real consequences, maybe you're not :D).
>> Pierre.
>>
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