[Radiance-general] evalglare with regular lens

[Christoph Reinhart]

Dear Ery,

If you do not have a full fisheye lens you should use a vertical illuminance measurement with the HDR image and feed the measured illuminance into evalglare. As Thomas noted, the resulting contrast portion (second part of DGP equation) might be wrong depending on what happens outside of the lenses view range. I'd be happy for Jan to add his two cents as well.

Best,

Christoph
Christoph Reinhart
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From: Thomas Bleicher [mailto:tbleicher at googlemail.com]
Sent: Monday, February 06, 2012 9:27 PM
To: Radiance general discussion
Subject: Re: [Radiance-general] evalglare with regular lens

Ery

You can use the pinterp program to convert from one projection to another. See the man page for an example or dig in the archives where this has been discussed before. However, note that the glare equations are based on a full hemispherical image. You will have to fill in the missing perimeter of your converted fisheye image with values of the right brightness or your glare evaluation will be off.

Regards,
Thomas
On Mon, Feb 6, 2012 at 9:15 PM, Ery Djunaedy <ery.mailinglist at gmail.com<mailto:ery.mailinglist at gmail.com>> wrote:
Folks,

I have a bunch of HDR images generated from photographs taken with regular -- non-fisheye -- lens. Is there a way that we can use these images for glare analysis in evalglare? The evalglare description says that it only accepts fisheye images. There is a tutorial from Harvard GSD (Doyle and Reihart) that shows a non-fisheye photo in evalglare: http://www.gsd.harvard.edu/research/gsdsquare/Publications/HDR_III_Evalglare.pdf

I am wondering whether this can be done at all.

Thanks,

Ery

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