[jawsscripts] Re: Convenient OCR usage with Flash installation window

  • From: "Geoff Chapman" <gch@xxxxxxxxxxxxxxxx>
  • To: <jawsscripts@xxxxxxxxxxxxx>
  • Date: Mon, 22 Oct 2012 10:54:29 +1100

ah. hmmm, Thanks Don for this further clarification upon contrast and 
enlargement.

I certainly hadn't cottoned on to the greyscale, then setting a "threshold?" 
and then converting to black and white thing.  I'm still not sure I totally 
get that, but it sounds like the conversion to greyscale thing is necessary 
before one can convert to the presumably more contrasted black/white.  upon 
which the OCR might conceivably do a better job.
Ok, I think I get that much.

And your saying this can't be done then, on the whole windows OS screen 
itself then, before running convenient OCR? and then setting it back to 
normal afterwards? Or I guess that isn't that feasible to do??? Maybe it 
can't even be done in windows colour schemes anywayz.

I wonder.


----- Original Message ----- 
From: "Don Marang" <donald.marang@xxxxxxxxx>
To: <jawsscripts@xxxxxxxxxxxxx>
Sent: Saturday, October 20, 2012 11:39 PM
Subject: [jawsscripts] Re: Convenient OCR usage with Flash installation 
window


> Normally, before performing OCR of a screen or window, an image of the
> area is taken and some preprocessing is performed.  It is possible to
> help with contrast problems to convert to grayscale and then set a
> threshold and convert to black and White.  Like I said before, most OCR
> engines do not do well with inverse video or low resolution, so
> reversing colors and enlarging 3x may be needed as well.
> However, I am not sure these OCR preprocessing tips help with the JAWS
> Convenience OCR.  I am not sure there is any method to manipulate or get
> access to the temporary image of the window before OCR is performed.
>
>
> *Don Marang*
> Vinux Package Development Coordinator - vinuxproject.org
> <http://www.vinuxproject.org/>
>
>
> On 10/20/2012 12:06 AM, Geoff Chapman wrote:
>> Thanks for this david.
>>
>> Firstly not relevant I know, but I simply cannot belieeeeeeve adobe has
>> gotten away with providing such a ridiculously inaccessibly/poorly coded
>> front end flash updater! for, - how many years now? just unbelievable!
>>
>>
>> Secondly though, I think somehow I've disabled this, or made it 
>> autoupdate
>> or something,
>> as I haven't seen it pop up on my machine for a goodish while now.
>>
>> Do you know if there's a way of forcing it to reappear by any chance?
>>
>> Problem is with messing with color schemes in windows, is I'd imagine
>> optimally you'd kinda need a sightling nearby to indicate what kind of
>> contrast difference one's choices actually visually made to that window,
>> before running the Convenient OCR test on it.
>> Would not one?
>> tricky!
>> ----- Original Message ----- 
>> From: "David Farough" <David.Farough@xxxxxxxxxxxxx>
>> To: <jawsscripts@xxxxxxxxxxxxx>
>> Sent: Saturday, October 20, 2012 12:47 AM
>> Subject: [jawsscripts] Convenient OCR usage with Flash installation 
>> window
>>
>>
>>> Recently someone on the list suggested that Convenient OCR might help
>>> with the Flash installation screen.  Recently I tried it out.  The only
>>> text that convenient OCR could find was the window title.  Probably
>>> because much of the window is dark red with light or white text.  Those
>>> infamous buttons are black text on a gray background.  this is a good
>>> example which seems to strengthen Don's findings.
>>>
>>> If anyone gets better results than I had I would be interested to know
>>> how they did it.
>>>
>>> David Farough
>>> Application Accessibility Coordinator/coordonateur de l'accessibilité
>>> Information Technology Services Directorate /
>>> Direction des services d'information technologiques
>>> Public Service Commission / Commission de la fonction publique
>>> Email / Courriel:  David.Farough@xxxxxxxxxxxxx
>>> Tel. / Tél:    (613) 992-2779
>>>
>>>>>> Don Marang <donald.
>>> Most of my experience with color combinations is with attempting to
>>> get
>>> good results from screen snapshots in Vinux with my speedy-ocr profgam.
>>>
>>> It needs good contrast and does not do well in inverse video.  I want
>>> to
>>> find a way to tell if inverse colors are being used, so I can reverse
>>> them again before performing OCR.  I probably will run the OCR both
>>> ways
>>> and pick the most accurate.  First, I need to determine automatically
>>> which is more accurate, possibly by getting confidence info from the
>>> OCR
>>> engine.
>>>
>>> I have yet to find an accessible light text on a dark background color
>>> scheme for my website suitable for low vision users.  I have not found
>>> good colors for visited, hover, and active links.
>>>
>>>
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