[BlindMath] Scanning braille for sight reading

White, Jason J jjwhite at ets.org
Wed Jul 26 14:56:18 UTC 2017


You could just use a good text editor such as Emacs, and set the fill column to 40 characters (or whatever your preferred line length is). You would need a braille display with a braille keyboard for text entry. BRLTTY supports computer braille text entry under Linux. If you want page breaks, you could introduce form feed characters manually or write a script to automate it.

> -----Original Message-----
> From: BlindMath [mailto:blindmath-bounces at nfbnet.org] On Behalf Of John G
> Heim via BlindMath
> Sent: Wednesday, July 26, 2017 10:50 AM
> To: steve.jacobson at visi.com; Blind Math list for those interested in
> mathematics <blindmath at nfbnet.org>
> Cc: John G Heim <jheim at math.wisc.edu>
> Subject: Re: [BlindMath] Scanning braille for sight reading
>
> I think what somebody else said was right -- the instructor is used to people
> taking photos with their phone and submitting that. But the whole reason I'm
> doing this is to find the best tools. I think I am going to see if I can find a linux
> text editor that allows me to generate brf files.  That ducksbury tool sounds
> interesting to me but right now, I must have linux.
>
>
>
> On 07/26/2017 08:52 AM, Steve Jacobson via BlindMath wrote:
> > John,
> >
> > I can see where increasing the DPI might help since the braille dot is
> > smaller than most characters.  Another thing to experiment with is
> > whether your scanner is getting the image in black and white or color.
> > I frankly don't know which will work the best because such things seem
> > variable.  I have had cases, though, where low contrast differences on
> > a page came out better in black and white because of the binary
> > nature, but it seems likely that approach might cause some dots to not
> > show at all falling below a threshold.  Obviously, the brightness
> > sensitivity can also matter.  I would think that an instructor in such
> > a course would have very specific recommendations, though, or perhaps
> > Hadley itself.  This does not seem like it would be an unusual problem.
> >
> > I, for one, would be interested to hear what you find out.  I don't
> > remember, are you an Optacon user?
> >
> > Best regards,
> >
> > Steve Jacobson
> >
> > -----Original Message-----
> > From: BlindMath [mailto:blindmath-bounces at nfbnet.org] On Behalf Of John
> G.
> > Heim via BlindMath
> > Sent: Wednesday, July 26, 2017 7:12 AM
> > To: Blind Math list for those interested in mathematics
> > <blindmath at nfbnet.org>
> > Cc: John G. Heim <jheim at math.wisc.edu>
> > Subject: Re: [BlindMath] Scanning braille for sight reading
> >
> > My instructor is sighted. She can sight-read the braille if the dots
> > come up clearly enough in the scanned document. I guess I wouldn't be
> > taking the course if I could see but if I could, all I'd have to do is
> > to keep tweaking the scanner settings until it worked. I think the
> > first thing I am going to do is increase the DPI. There is a lot of
> > info out there that says 300 DPI is best for OCR and my own
> > experiments have confirmed that.  But a higher DPI might be better
> > just to get braille dots to show up on a scanner.
> >
> >
> >
> > On 07/26/2017 04:43 AM, George Bell wrote:
> >> Hi John,
> >>
> >> Scanning embossed braille is not an easy task.  Indeed there was once
> >> a program called "OBR" (Optical Braille Recognition).  But even that
> > required
> >> that specific makes and models of scanner be used, which allowed
> >> control
> > of
> >> lighting during the scan.
> >>
> >> You instructor should know this.
> >>
> >> Do I get the impression you are using a Perkins type braille writer
> >> as opposed to say 6 key entry into PC braille software such as Duxbury?
> >>
> >> George
> >>
> >> -----Original Message-----
> >> From: BlindMath [mailto:blindmath-bounces at nfbnet.org] On Behalf Of
> >> John G Heim via BlindMath
> >> Sent: 25 July 2017 15:02
> >> To: Blind Math list for those interested in mathematics
> >> Cc: John G Heim
> >> Subject: [BlindMath] Scanning braille for sight reading
> >>
> >> I'm taking a braille class through Hadley School for the Blind. I am
> > trying
> >> to submit my homework assignments as scanned images of braille pages
> >> for
> > the
> >> instructor to sight-read. The instructor asked me to scan them as
> >> photos
> > but
> >> I don't know what that means. Does anybody have experience scanning
> >> in braille and can tell me the best format, mode, and dpi settings? I
> >> sent my instructor tif line-art at 300 dpi which works well for OCR
> >> but that
> > didn't
> >> work for sight-reading braille.
> >>
> >>
> >> --
> >> --
> >> John G. Heim; jheim at math.wisc.edu; sip://jheim@sip.linphone.org
> >>
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