[Geowanking] Andropid/iPhone parameters for AR like applications

[Martin Tomko]

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...
Argh.
Martin

Christian Willmes wrote:
> Hi,
>
> 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.).
>
> Cheers
> Christian
>
> 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 
>> 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: 	martin.tomko at geo.uzh.ch
site:	http://www.geo.uzh.ch/~mtomko
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