Hi Christian,
unfortunately, I don't have the devices myself, I only have access to
the photos they produce... But I can ask some friends.
What I want is the actual values (that are hardware bound and do not
change) of the sensor size (in mm), and the focal length (again, if the
actual zoom is not optical, this is constant. If the zoom is optical, it
should change - but in the exif metadata that I get from the Android
devices, I cannot find the values for the focal length used...).
Cheers
Martin
Christian Willmes wrote:
Hi Martin,
Martin Tomko schrieb:
Dear geo... folks,
following the AR discussion recently, I thought this may be the right
forum to ask, as I assume that Android and iphone devices are widely
used by mobile AR developers.
Would you by any chance know where to find the folllowing information?:
- physical sensor sizes (that is, in mm).
- optical focal length (preferable) or focal length in 35mm equivalent
I did not worked on an implementation yet, but I would assume that you
can read out this parameters from the particular systems OS.
Are you asking for some Android or iPhone API calls, to get this
information or do you mean something else?
Alternatively, do you guys know what angle of view do these devices
have (as far as I know, there is no zoom, so it should be only one
value, right)? For whatever view-based application these parameters
are crucial to compute the visible field of view. And as far as I can
tell, they are not available anywhere...
As far as I know there is zoom. And it should be possible to get the
actual zoom state from the device OS itself.
regards,
Christian
--
Martin Tomko
Postdoctoral Research Assistant
Geographic Information Systems Division
Department of Geography
University of Zurich - Irchel
Winterthurerstr. 190
CH-8057 Zurich, Switzerland
email: [email protected]
site: http://www.geo.uzh.ch/~mtomko
mob: +41-788 629 558
tel: +41-44-6355256
fax: +41-44-6356848
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