(keitai-l) Re: questions abt Japanese phonecams, focal distance

I have worked with QR codes a great deal for both onscreen and print
display. The size you use them at really depends on the method of delivery.
Many companies tend to display them much to large on their web sites, making
them useless to cameras that do not have a macro switch. I learned this
first hand as one of my previous foma handsets did not. What this meant is
that by the time I had the camera far enough away from the screen to get the
entire code in, it would be out of focus. You can print them very small and
still have positive recognition, however you must be careful on how you go
about scaling them. Any anti-aliasing due to improper resizing can make them
useless.
regards,
Kris

-----Original Message-----
From: keitai-l-bounce@appelsiini.net
[mailto:keitai-l-bounce@appelsiini.net]On Behalf Of Slavin (area/code)
Sent: Wednesday, August 31, 2005 1:45 PM
To: keitai-l@appelsiini.net
Subject: (keitai-l) Re: questions abt Japanese phonecams, focal distance


Interesting, thanks a lot Curt --

To your point, I think figuring out what the QR standards are is a good way
to go. I am looking around for them. I am wondering if anyone has firsthand
experience with using them; how small do they get? are they fixed size? I
was under the impression they could get <1 cm^2.

I can't explain what we're trying to recognize, only because it takes a bit
of work to explain it -- as soon as we have the website up (next 2 days or
so) I'll post it. Whatever you're expecting, it's not that...

And xool, I didn't know about the wiki, but indeed, as I figure this out,
I'll post it.

thx

K


----- Original Message -----
From: "Curt Sampson" <cjs@cynic.net>
To: <keitai-l@appelsiini.net>
Sent: 30 August, 2005 10:14 PM
Subject: (keitai-l) Re: questions abt Japanese phonecams, focal distance


>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?
>
> cjs
> --
> Curt Sampson  <cjs@cynic.net>   +81 90 7737 2974
>
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