[Blindmath] Extracting bitmap images from pdf files

[Pickrell, Rebecca M (TASC)]

Can somebody explain what a touchpad is?
I'm thinking of touch screen, and getting hung up I think.
Can anybody enlighten me?

-----Original Message-----
From: blindmath-bounces at nfbnet.org [mailto:blindmath-bounces at nfbnet.org] On Behalf Of Ben Humphreys
Sent: Wednesday, January 25, 2012 2:34 PM
To: john.gardner at orst.edu; Blind Math list for those interested in mathematics
Subject: Re: [Blindmath] Extracting bitmap images from pdf files

Wow - Now I finally understand how the touchpad and embosser work
together to enable greater functionality.

It's a Eureka moment!

Ben

At 01:33 PM 1/25/2012, you wrote:
>Dick, if someone is fortunate enough to have a ViewPlus embosser and IVEO
>Creator Pro, she can have pretty good access to images.
>* import the PDF into IVEO Creator Pro.
>* Check the PDF to find which pages have images of interest and emboss those
>pages.
>* Put the embossed page on the touchpad and "Zoom Rectangle" by clicking on
>diagonally-opposite corners of the image of interest.  This will zoom that
>image to occupy maximum size the page will permit.
>* Emboss the zoomed image and read it using the touchpad.  Horizontal text
>on the image should read when pressed.  The OCR in Creator Pro works really
>well with PDF's so if the resolution is at all decent, the text usually is
>OCRed well.
>* Go back to the original image and do same for any other image on that
>page.  Repeat for images on other pages.
>
>Note that a sighted person can skip the first embossing step and just zoom
>those images.  Handy to have sighted people around, but if there aren't it
>just takes a little longer.  By the way, that sighted person can create
>overlays on important objects on the graphic and label them to improve
>accessibility even more.
>
>John
>
>-----Original Message-----
>From: blindmath-bounces at nfbnet.org [mailto:blindmath-bounces at nfbnet.org] On
>Behalf Of Richard Baldwin
>Sent: Wednesday, January 25, 2012 10:08 AM
>To: BlindMath Mailing List; accessibleimage at freelists.org
>Subject: [Blindmath] Extracting bitmap images from pdf files
>
>Many blind students receive electronic textbooks in pdf format.
>
>Many textbooks contain lots of images.
>
>Many images are poorly described in textbooks.
>
>Various ways to convert bitmap images into tactile images are available --
>some fairly good, some not so good, some very poor. However, regardless of
>the quality of the conversion to tactile format, you must have the original
>image file in order to get anything.
>
>I have tried four or five different online file conversion sites in an
>attempt to find a clean way that a blind student can extract the images
>from a pdf textbook file without success. Different sites have different
>problems, but they all seem to have some kind of problems that make it very
>difficult to extract the images from pdf files.
>
>Has anyone identified an online site or downloadable program that is
>available either free or at a reasonable price to cleanly extract the
>images from pdf files, which often range up to 10 or more megabytes  or
>more in size?
>
>Thanks,
>Dick Baldwin
>
>--
>Richard G. Baldwin (Dick Baldwin)
>Home of Baldwin's on-line Java Tutorials
>http://www.DickBaldwin.com
>
>Professor of Computer Information Technology
>Austin Community College
>(512) 223-4758
>mailto:Baldwin at DickBaldwin.com
>http://www.austincc.edu/baldwin/
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