EU - test-drb@ccmp.vtda.org

11 Jun 2006

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:
...
  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 desperate, but not 
...
  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.

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