I don't think that Joi's image is very typical. Most keitai are
basically fixed-focus, think, with a macro switch for close-range stuff.
Completely anecdotal here, but I just had a look at a DoCoMo Sony 506iC
and an AU Casio W21CA. In both cases the lens seems about to be about
35mm (in a rough comparison with the 24mm lens currently mounted on
my SLR). They both give sharp (well, as far as I can determine on the
low-resolution screen) focus down to about 8-10 cm., which covers about
a 4x6 cm area.
One thing you might check out would be the standards for QR code
recognition; that could possibly give you all you need to know about
what you can and can't do recognition on, at least for monochrome data.
Just out of curiousity, what are you trying to recognize?
Oh, and when you figure all this out, stick it up on the Wiki, eh?
Curt Sampson <email@example.com> +81 90 7737 2974
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Received on Wed Aug 31 05:14:42 2005