[bksvol-discuss] Re: Bad pages in scan
- From: "Shelley L. Rhodes" <juddysbuddy@xxxxxxxxxxxx>
- To: <bksvol-discuss@xxxxxxxxxxxxx>
- Date: Sun, 2 Jan 2005 14:01:27 -0500
The irony of that Guido, was two of the books were scanned using grayscale,
and I had to rescan and replace one page in one and replace three pages in
another. They were both novels by the same author, and publisher, one a
hard cover the other a paperback.
I do set brightness, when using static thresholding.
It is such a dramatic change, from readable with very few errors to
something well the cat dragged across the scanner, so to speak.
I am glad I am reading the books to find these little errors, but they are
still annoying and unexpected. Especially when I have returned the books to
the library and must go get them to rescan the proper pages.
Shelley L. Rhodes and Judson, guiding golden
juddysbuddy@xxxxxxxxxxxx
Guide Dogs For the Blind Inc.
Graduate Advisory Council
www.guidedogs.com
The vision must be followed by the venture. It is not enough to
stare up the steps - we must step up the stairs.
-- Vance Havner
----- Original Message -----
From: "Guido Corona" <guidoc@xxxxxxxxxx>
To: <bksvol-discuss@xxxxxxxxxxxxx>
Sent: Sunday, January 02, 2005 1:29 PM
Subject: [bksvol-discuss] Re: Bad pages in scan
Shelley, if you use grayscale there is no need to worry about brightness,
but with static threshold you also need to set brightness to the correct
level. It is possible that a couple of pages in the book may be a lot
lighter or a lot darker, causing a problem with static reco. In general
it is easier to get good results with grayscale than with static
threshold.
With static threshold and an EPSON scanner, the best brightness levels
usually range from 73 to 75.
Guido
Guido Dante Corona
IBM Accessibility Center, Austin Tx.
Research Division,
Phone: 512. 838. 9735.
Email: guidoc@xxxxxxxxxxx
Web: http://www.ibm.com/able
"Shelley L. Rhodes" <juddysbuddy@xxxxxxxxxxxx>
Sent by: bksvol-discuss-bounce@xxxxxxxxxxxxx
01/01/2005 11:03 PM
Please respond to
bksvol-discuss
To
<bksvol-discuss@xxxxxxxxxxxxx>
cc
<k1000@xxxxxxxxxxxxxxxxxxxxxxxx>
Subject
[bksvol-discuss] Bad pages in scan
I have noticed something while scanning books in two page mode. Even with
the confidence setting set at a reasonable percentage mine is at 97.5% It
will confidently misrecognize it seems at least one page in the books I am
doing.
I have been noticing this more as I do more books for Bookshare and edit
them before submitting.
Out of the last three books I scanned with two page mode, all of them,
had
one to three pages I had to rescan. I have ran across some books where
this doesn't happen but they seem to be pretty rare.
I usually have columns on, two page scanning, and either static or
grayscale
threshold. The pages it messes up on are usually text, no pictures.
And the really strange part is these particular pages are easy one's to
recognize.
I do line the book up flush, and it is usually at an optomized setting,
but
it kind of bugs me as I have to go back later, and get the book to replace
the pages.
I wonder why it is happening though.
Shelley L. Rhodes and Judson, guiding golden
juddysbuddy@xxxxxxxxxxxx
Guide Dogs For the Blind Inc.
Graduate Advisory Council
www.guidedogs.com
The vision must be followed by the venture. It is not enough to
stare up the steps - we must step up the stairs.
-- Vance Havner
Other related posts:
