[Radiance-general] pinterp on a rectangle image

[Thomas Bleicher]

Ery

Without modification you can't use the cropped image as input to pinterp.
You have to add an appropriate "view ..." line to the header of the cropped
image manually to give pinterp the information it needs for the conversion.

If you are just taking away the black area to the left and right of a (180
degree) angular fisheye projection you can copy the view line from the
original file and only adjust the "-vh" value to match the "-vv" value. If
you also reduce the opening angle you have to calculate how large the
cropped angle would be and add that as the value for "-vv" and "-vh".

Regards,
Thomas

On Sun, Feb 12, 2012 at 9:00 AM, Ery Djunaedy <ery.mailinglist at gmail.com>wrote:

> Greg,
>
> I guess the more important question is whether or not the original file
> can be used? The purpose for this conversion is to calculate the
> illuminance at the camera point.
>
> Thanks,
>
> Ery
>
>
> On 02/11/2012 09:48 PM, Greg Ward wrote:
>
>> 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@**gmail.com<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
>>>
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