[Radiance-general] pinterp on a rectangle image

[Greg Ward]

Hi Ery,

Pcompos isn't smart enough to adjust the view after cropping, so it doesn't write it into the header in a way that pinterp can use it.

The image may be coming out square because a hemispherical fisheye can encompass at most 180 degrees vertically and horizontally, whereas an angular fisheye can be up to 360 degrees.  You can of course specify a different horizontal and vertical size with the -vh and -vv options, but both must be less than 180.

What is the view in your original fish.hdr file?

-Greg

> From: Ery Djunaedy <ery.mailinglist at gmail.com>
> Date: February 11, 2012 4:54:07 PM PST
> 
> Folks,
> 
> I want to convert an angular fisheye to a hemispherical fisheye, like the example in pinterp man page.
> 
> pinterp -vf fish.hdr -vth -ff fish.hdr 1 > hemi.hdr
> 
> My concern is that pinterp force the result image to be a square. The image that I have is a rectangular image, with the fisheye circle in the middle. When I use the above command, the result is always a square.
> 
> My question: is the interpolation also applied to the black region on the left and right side of the fisheye circle?
> 
> I tried to crop the input hdr to square with the following command (from 5616x3744 to 3744x3744 pixels):
> 
> ra_xyze -r -u -o fisheye.hdr | pcompos -x 3744 - -936 0 > fisheye_crop.hdr
> 
> But when I use fisheye_crop.hdr as an input to the pinterp command, it gives a "bad view file"error. Does this simply confirm that man page that the output of pcompos cannot be used with pinterp?
> 
> Thanks,
> 
> Ery