There's another good paper on this subject by Jessi Stumpfel et al.
http://gl.ict.usc.edu/skyprobes/
-Greg
> From: "Guglielmetti, Robert" <[email protected]>
> Date: January 25, 2011 3:50:37 PM PST
>
> On 1/25/11 4:33 PM, "Lars O. Grobe" <[email protected]> wrote:
>
>> Hi Claus!
>>
>> I am not optimistic about capturing sky and sun using a simple camera.
>> Without worrying about hdr codes - unless you achieve an exposure quick
>> enough to have a non-saturated sun image, the hdr code cannot do the
>> magic and invent pixel values. You may try low-transmission filters, but
>> that costs you the weaker sky luminances. So probably, hardware needed.
>
>
> You could use filters to get the luminance peaks and extend the series by
> re-shooting without the filter. Time and camera handling are definitely a
> problem for getting an honest (and alignable) LDR series. Greg has a paper
> on this someplace, I think. Can't find it right now...
>
>
> Rob Guglielmetti IESNA, LEED AP
>
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