Hi Raghu,
The spot luminance measurements should ideally be done for several
ranges for each HDR capturing (e.g. one reference area with 100cd/m2,
another one with several thousands) and finally you compare the
illuminance of the image with the measured one and you should reject any
image with a deviation larger than 25% deviation of the illuminance.
With a proper calibration you can be also within 10%.
Definitely the luminances of your image are totally off (=physically
impossible, at least factor 50 for the blue sky) - it has nothing to do
with evalglare.
BTW. evalglare calculates the illuminance also for that image (617414.88
lux) - there is no limit or "out of bounds". Just that your image has
much too high luminances, so you get also an unrealistic illuminance...
It is hard to tell where the problem lies exactly, but definitely it is
caused by your applied hdr generation process.
Cheers
Jan
On 06.02.18 18:57, Raghuram Kalyanam wrote:
Hi Jan,
We did the calibration and the results of spot luminance measured and
calculated from HDR for the light source (calculated with custom made
tool ) is very close.
I want to compare the measured Vertical eye illuminance with the one
calculated with evalglare, but the results are out of bounds from
evalglare, so i couldn't even compare.
Could you suggest me anything else i should be taking care of? Any
ideas.
Best Regards,
Raghu
On Feb 6, 2018 6:24 PM, Jan Wienold <jan.wien...@epfl.ch> wrote:
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 <kalya...@rhrk.uni-kl.de
<mailto:kalya...@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
<gregoryjw...@gmail.com
<mailto:gregoryjw...@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 <kalya...@rhrk.uni-kl.de
<mailto:kalya...@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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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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