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List: freedesktop-create
Subject: Re: [CREATE] [hugin-ptx] Re: Lens correction database
From: "Pablo d'Angelo" <pablo.dangelo () web ! de>
Date: 2007-05-11 7:22:01
Message-ID: 46441999.3030804 () web ! de
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Hi Arnd,
Arnd Baecker schrieb:
> On Fri, 11 May 2007, Pablo d'Angelo wrote:
>
> [...]
>
>
>> The problem is that the distortion parameters change with the focus. They
>> are different for short distance (as in the test shots) and the far distance
>> (where the camera is usually used).
>
> Unfortunately, not all cameras store the focus distance in their
> exif. For example for Canon EOS (20D ,300D, 350D, 5D, Digital Rebel XT,
> 1D, 1Ds) see,
> http://photo.net/bboard/q-and-a-fetch-msg?msg_id=00F5eG
> the Makernote 0x0004: FocusDistanceUpper and FocusDistanceLower
> always show 0.
>
> Maybe it is still hidden somewhere in the makernote ...
Yes, EXIF data is not reliable and I think, an automated lookup doesn't work
in practice (at least for the focus distance).
I guess, we should focus on the far distance parameters, since most images
are in that category.
ciao
Pablo
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