Hi Zhe,
You should be able to apply the fisheye_corr.cal file I gave you earlier to
correct the distortion and make it an angular fisheye image that pinterp works
with. (Why you need pinterp, I am not sure.) The command is as suggested in
the fisheye_corr.cal file itself:
pcomb -f fisheye_corr.cal -o fisheye.hdr \
| getinfo -a "VIEW= -vta -vh 180 -vv 180" \
> corrected.hdr
This will also crop the area outside of 180° to black, assuming that is what
you want. It assumes that you have already cropped the image to a minimum
square area. You should apply vignetting correction and absolute calibration
first.
Cheers,
-Greg
> From: Zhe Kong <[email protected]>
> Date: January 25, 2017 1:15:49 PM PST
>
> Dear list:
> I am trying to compare HDR images and simulated luminance maps. Since I use
> SIGMA 8mm 1:3.5 for Canon, I need to convert equisolid-angular to equiangular
> project. I see very useful information from the post below:
>
> https://www.radiance-online.org:447/pipermail/radiance-general/2015-August/011184.html
>
> However, I still have some questions need to figure out.
> 1) pinterp does not include equisolid-angular projection, so a equation needs
> to be applied to the function. Greg mentioned this simple expression,
> sin(theta)/theta, but I am still confused. Could anyone offer me the command?
>
> 2) The post discussed the steps of processing HDR images. If I get it right,
> the steps following "adjust exposure" are vignetting correction, adding view
> information, converting project from equisolidangular to equiangular, then
> calibrating the image. I use a GOSSEN Starlite 2 to record the luminance
> value on a grey card for calibration. My question is, should I calibrate the
> image before or after converting fisheye projection?
>
> Any suggestions or explanation would be appreciated.
> Zhe
>
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