[Geowanking] Andropid/iPhone parameters for AR like applications
martin.tomko at geo.uzh.ch
Fri Sep 18 04:16:57 PDT 2009
Yes, that was my first try... You rarely get the description of the
physical sensor size, though. Even for "normal" cameras - you have to
search for it, for instance on dpreview...
Christian Willmes wrote:
> Oh then I can't help in the moment... because I don't have such fancy
> devices myself either. ;-)
> But I would try to investigate the technical descriptions of the
> devices (which are mostly available online) from the manufacturers
> (Apple, HTC, Samsung, Nokia etc.).
> Martin Tomko schrieb:
>> 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
>> 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
>>>> - 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.
Postdoctoral Research Assistant
Geographic Information Systems Division
Department of Geography
University of Zurich - Irchel
CH-8057 Zurich, Switzerland
email: martin.tomko at geo.uzh.ch
mob: +41-788 629 558
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