OCR with NVDA


Bernd Dorer
 

Hi Quentin,

i tried to scan a pdf in full screen mode and the results wit windows 10 OCR were really bad while ocr with tesserract were really good. In my point of view the OCR addon should updated with a new versio of tesserract.
I asked the Author which is busy at the moment.

best regards

Bernd

Am 05.05.2021 um 01:54 schrieb Quentin Christensen:

NVDA will work on scanned PDFs, although with the caveat noted earlier about the amount visible on screen.

I believe, Jaws has a commercial OCR engine, and just like Eloquence, the cost of that is part of what you pay for Jaws.  If you would like the same for NVDA, purchasing something like Abbyy FineReader will give you more OCR functionality using NVDA.

On Wed, May 5, 2021 at 3:39 AM David Kingsbury <davidkingsbury77@...> wrote:

Hi all,

I was trying to recognize a scanned PDF. JAWS Convenient OCR does this very nicely, but after first saying “empty document.” Sounds like the NVDA OCR will not work on scanned PDFs if they start out as empty documents. Is this correct?

David



--
Quentin Christensen
Training and Support Manager



Quentin Christensen
 

NVDA will work on scanned PDFs, although with the caveat noted earlier about the amount visible on screen.

I believe, Jaws has a commercial OCR engine, and just like Eloquence, the cost of that is part of what you pay for Jaws.  If you would like the same for NVDA, purchasing something like Abbyy FineReader will give you more OCR functionality using NVDA.

On Wed, May 5, 2021 at 3:39 AM David Kingsbury <davidkingsbury77@...> wrote:

Hi all,

I was trying to recognize a scanned PDF. JAWS Convenient OCR does this very nicely, but after first saying “empty document.” Sounds like the NVDA OCR will not work on scanned PDFs if they start out as empty documents. Is this correct?

David



--
Quentin Christensen
Training and Support Manager


David Kingsbury
 

Hi all,

I was trying to recognize a scanned PDF. JAWS Convenient OCR does this very nicely, but after first saying “empty document.” Sounds like the NVDA OCR will not work on scanned PDFs if they start out as empty documents. Is this correct?

David


Quentin Christensen
 

Yes being able to only OCR what is visible on screen is definitely a limitation.  I normally recommend setting documents to 100% zoom or page width etc.  If you have the document zoomed out so you can see 100 pages on screen, NVDA won't be able to recognise any text on such small pages.  If you have it zoomed in so you can only see one character, that's all it will be able to recognise.  Knowing the limitations, the OCR feature is useful, but doesn't replace a fully functional OCR program.


On Tue, May 4, 2021 at 7:27 AM Brian Vogel <britechguy@...> wrote:
On Mon, May 3, 2021 at 05:23 PM, Sascha Cowley wrote:
The Windows 10 OCR built in to NVDA only recognises text that is visible on screen.
-
Thanks.  This is what I thought I had recalled about the scope of what gets OCRed.  Not that this can't be handy, that's for sure, but if I want an entire file OCRed I pre-process with the OCR software of my choosing before ever opening it in the PDF reader of my choosing.
 
--

Brian - Windows 10 Pro, 64-Bit, Version 20H2, Build 19042  

Always remember others may hate you but those who hate you don't win unless you hate them.  And then you destroy yourself.

       ~ Richard M. Nixon

 



--
Quentin Christensen
Training and Support Manager


 

On Mon, May 3, 2021 at 05:23 PM, Sascha Cowley wrote:
The Windows 10 OCR built in to NVDA only recognises text that is visible on screen.
-
Thanks.  This is what I thought I had recalled about the scope of what gets OCRed.  Not that this can't be handy, that's for sure, but if I want an entire file OCRed I pre-process with the OCR software of my choosing before ever opening it in the PDF reader of my choosing.
 
--

Brian - Windows 10 Pro, 64-Bit, Version 20H2, Build 19042  

Always remember others may hate you but those who hate you don't win unless you hate them.  And then you destroy yourself.

       ~ Richard M. Nixon

 


Sascha Cowley
 

The Windows 10 OCR built in to NVDA only recognises text that is visible on screen.


mk360
 

Hi,

How you located on the object to recognise? what commands you used to review the text? Keep in mind that you need to place the object navigator on the object where you will use OCR, press VNDA r, and use object review commands to see the results.

Regards,

mk.

El 03/05/2021 a las 16:18, David Kingsbury escribió:

Hi all,

Using the most recent version of NVDA, I installed the OCR addon, made sure my recognition language was English, and attempted to run OCR on a scanned PDF by pressing NVDA +R. It says OCR running and then done, but nothing appears. Any idea what I am doing wrong?

Thanks,

David

 

 


 

Are you certain that there is text to recognize?

Also, and someone else with more expertise than I can answer this, will NVDA OCR (which uses Windows 10 OCR) actually process an entire document or just the portion visible on the screen?  The User Guide and Quick Commands Reference both state, "To recognize the text in the current navigator object using Windows 10 OCR, press NVDA+r."  I have never been entirely clear as to what the scope of "the current navigator object" is in this context.
--

Brian - Windows 10 Pro, 64-Bit, Version 20H2, Build 19042  

Always remember others may hate you but those who hate you don't win unless you hate them.  And then you destroy yourself.

       ~ Richard M. Nixon

 


David Kingsbury
 

Hi all,

Using the most recent version of NVDA, I installed the OCR addon, made sure my recognition language was English, and attempted to run OCR on a scanned PDF by pressing NVDA +R. It says OCR running and then done, but nothing appears. Any idea what I am doing wrong?

Thanks,

David