10 Jun
2006
10 Jun
'06
10:47 p.m.
so if someone puts a readable image of 2 facing pages
of text in front of you, will all that stuph you typed
still mean that much? And desperate as in the device
now being used by libraries to archive countless
tomes, the link to which was posted here a couple of
months ago? Desperate or not, I refuse to sit and flip
a book over ~500 times. I have obtained very suitable
results with a cheap Aiptek Pencam SD (1.2mp) - on the
first try! And image enhancement is possible if the
results are less then desireable
--- cctech-bounces at classiccmp.org
<frustum at pacbell.net> wrote:
desperate, but not
Chris M wrote:
> now an even better idea then a scanner is a
digital
> camera. 2 - 3 megapixels (even 1.2!) is
sufficient
for
> archiving text and graphics. It MUST have the
ability
> where you can vary the focal length (able to move
a
> fixed focus lense in and out in relation to the
image
> sensor. And you thought I wasnt going to say that
all
> wrong?). I would also deem ancillary storage
(i.e
> cflash etc) a necessity. Cheaper to ship then a
> scanner. Flat bed scanners are unwieldy,
especially
when it comes
to archiving bound stuph.
What you propose is something to do if you are something you'd want to do routinely.
Taking a picture of an 8.5" x 11" sheet of paper
with a 1.2 mpix camera
would get you 113 DPI.
In reality, it is worse than that. 99% of all
digital cameras lie about
their DPI -- a 1.2 mpix camera doesn't have 1.2
mpix
red, 1.2m green,
1.2m blue sensors. Different sensors have different
patterns, but
essentially they count each r, g, or b subsample as
a pixel and
interpolate. a common pattern is a tiling like this
R G B G
G B G R
Heavy duty image processing does its darnedest to
hide this fact, but it
is obvious in certain circumstances. Take a picture
of a B&W newspaper
from some distance where you will get some aliasing
and then look at the
picture -- you'll get lots of color fringing. The
only camera sensor
that doesn't do this is the one from foveon:
http://www.foveon.com/
This is a nice tie in to classiccmp -- the CEO of
Foveon is Federico
Faggin, co designer of the 8080 and co-founder of
Zilog.
Finally, the linearity of cameras is horrible for
work like this, so the
effective DPI will drop even lower.
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com