[Radiance-general] Faulty fisheye HDR, DGP always 1.0

[Jan Wienold]

was it taken on mercury ? ;-)

the luminances are far off... it sums up to more than 600000 lux
Jan


On 06.02.18 18:18, Greg Ward wrote:
> Hi Raghu,
>
> We may need to wait to hear from Jan or someone who understands 
> evalglare better than I do.  I don't think there is a problem with 
> your HDR image as you generated it.
>
> -Greg
>
>> *From: *raghuram kalyanam <kalyanam at rhrk.uni-kl.de 
>> <mailto:kalyanam at rhrk.uni-kl.de>>
>>
>> *Date: *February 6, 2018 9:05:41 AM PST
>>
>> *
>> *
>>
>> Hi Greg,
>>
>> I added these options while passing to evalglare like below.
>>
>> evalglare -vta -vh 180 -vv 180 <hdr file>, and it worked but it 
>> always gives 1.0 as DGP (even other parameters are out of bounds).
>>
>> With out those options evalglare throws an error.
>>
>> Apart from that
>>
>> Are all the LDR’s provided, valid to combine into HDR?
>>
>> I doubt if one or more of the LDR’s is the culprit (especially 
>> something to do with over or under exposure).
>>
>> Best Regards,
>> Raghu
>>
>>> On Feb 6, 2018, at 5:05 PM, Greg Ward <gregoryjward at gmail.com 
>>> <mailto:gregoryjward at gmail.com>> wrote:
>>>
>>> Hi Raghu,
>>>
>>> It looks like your HDR image header is missing the necessary view 
>>> information.  Typically, this might be something like:
>>>
>>> VIEW= -vta -vh 180 -vv 180
>>>
>>> for a perspective such as yours.  You should be sure that your 
>>> fisheye mapping corresponds to one of the standard Radiance types.
>>>
>>> Best,
>>> -Greg
>>>
>>>> *From: *raghuram kalyanam <kalyanam at rhrk.uni-kl.de 
>>>> <mailto:kalyanam at rhrk.uni-kl.de>>
>>>> *Date: *February 6, 2018 5:21:59 AM PST
>>>> *
>>>> *
>>>> Hi All,
>>>>
>>>> I am trying to asses visual discomfort  using fisheye HDR images. 
>>>> We generated HDR image from a set of 360 degree LDRs and then 
>>>> converted to fisheye HDR ( using a custom made tools). The 
>>>> intension was to use these Fisheye HDRs as input to Evalglare and 
>>>> get DGP value. The Camera used is Ricoh Theta V 360 degree camera.
>>>>
>>>> The problem I am facing is, the DGP calculated from the generated 
>>>> fisheye HDR with Evalglare is always 1.0. We did the calibration 
>>>> but I would like to have expert opinion from you people, what is 
>>>> going wrong with these set of images. Here is the link 
>>>> <https://seafile.rlp.net/f/0212995d110648d38032/?dl=1> to the pictures.
>>>>
>>>> It would be great if anyone could identify the issue.
>>>>
>>>> Best Regards,
>>>> Raghu
>>
>
>
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-- 
Dr.-Ing.  Jan Wienold
Ecole Polytechnique Fédérale de Lausanne (EPFL)
EPFL ENAC IA LIPID

http://people.epfl.ch/jan.wienold
LE 1 111 (Office)
Phone    +41 21 69 30849

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