what software used for ocr on linux

Krishnakant Mane krmane at gmail.com
Fri Jul 11 07:28:57 UTC 2014

Sorry guys, I really missed the discussion.
I guess there are a few options and we have to combine a few things here 
and there.
So what is the best combination as of now?
Happy hacking.
On Friday 11 July 2014 12:49 PM, Willem van der Walt wrote:
> The abbyy engine does auto rotation detection or whatever the correct 
> term is.  I found that one need to use the contrast setting of 
> scanimage for best results.
> On Fri, 11 Jul 2014, Tony Baechler wrote:
>> I vaguely recall Tesseract having an option for this, but it isn't
>> automatic.  Convert from ImageMagick should do that as well, but it 
>> isn't
>> automatic either.  The short answer is trial and error if memory 
>> serves.  I
>> remember thinking that maybe the reason for the terrible OCR is due 
>> to the
>> pages not being aligned and rotating the images, but I didn't get any 
>> better
>> results.  I haven't played with the other OCR engines.  I think 
>> FineReader
>> is better about this.  I'm possibly wrong here, but as I understand 
>> it, the
>> Windows software for the blind does the image rotation before passing 
>> it to
>> the OCR engine and detects the page misallignment during the scanning
>> process.  The Internet Archive seems to use FineReader and scans 
>> millions of
>> books in all kinds of conditions, so perhaps it can handle the rotation
>> automatically.
>> On 2014-07-10 06:49 AM, Sam Hartman wrote:
>>> Is there a way to get tesseract or openocr or anything open-source to
>>> deal with rotations?
>>> The commercial software along with anything targeted for the blind 
>>> tends
>>> to
>>> 1) deal with 90 or 180-degree rotaions--I put the book down on the 
>>> glass
>>> in the wrong orientation
>>> and
>>> 2) Deal with small rotations (it wasn't perfectly aligned) relatively
>>> well.
>>> I find these features really important when scanning things myself.
>>> Less so when OCRing images from the web etc.
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>> -- 
>> Have a good day,
>> Tony Baechler
>> tony at baechler.net
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