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

[Greg Ward]

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>
> 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> 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>
>>> 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 to the pictures.
>>> 
>>> It would be great if anyone could identify the issue.
>>> 
>>> Best Regards,
>>> Raghu
> 
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