[Radiance-general] calculating global illuminance from an HDR image of an angular, fish-eye view

[Humann Chris]

Dear group,

I recall seeing a 'pcomb' routine listed here for calculating the  
global illuminance of a HDR scene calculated with  an angular fish-eye  
view (-vta) but now can't seem to find it.  Does anyone have this that  
they would be willing to share?

As always, thanks and best regards.

Chris

Christian Humann ~ Associate
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On Sep 23, 2010, at 10:53 AM, Lars O. Grobe wrote:

> Hi,
>
> There are cheap photospectrometers available starting at $1000, but  
> if you want to measure total luminous flux or diffuse reflectance,  
> you will need an integrating sphere. The sphere is the expensive  
> component of such a setup.
>
> Cheers, Lars.
>
> --
> Dipl.-Ing. Architect Lars O. Grobe
>
> On Sep 23, 2010, at 19:44, "Randolph M. Fritz" <RFritz at lbl.gov> wrote:
>
>> Christoph,
>>
>> Imaging technology is awfully cheap these days. I think something  
>> could be improvised with standard filters and a moderately-priced  
>> camera, but it would take some expertise to design, fabricate, and  
>> calibrate.  Design expertise, of course, we have on this list,  
>> fabrication and calibration, not so much (at least, I don't think  
>> we do.)  Have you thought about wandering over to your local  
>> physics department & asking for help?  Or perhaps to MIT?  It might  
>> make a good student project.
>>
>> Randolph
>>
>>
>> On 2010-09-23 10:05:56 -0700, Reinhart, Christoph said:
>>
>>> Dear all:
>>>
>>> I am looking for an affordable (<$3000) set of devices that can  
>>> measure the spectral power distribution of light sources in the  
>>> visible range as well as wavelength dependant surface  
>>> reflectances. Does something like this exist? At the NRC we had a  
>>> $10,000 Minolta spectrometer that measured wavelength dependant  
>>> diffuse reflectances as well as overall specular reflectance. Are  
>>> there any more affordable devices? What are you using for light  
>>> sources?
>>>
>>> Christoph
>>>
>>> _______________________________________________
>>> Radiance-general mailing list
>>> Radiance-general at radiance-online.org
>>> http://www.radiance-online.org/mailman/listinfo/radiance-general
>>
>>
>> -- 
>> Randolph
>>
>>
>>
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