Fish-eye-lens images to lat-long mapping

hdri
1

Dear list members,

I use HDRShop to convert between mappings for environment maps, e.g., from mirror ball to lat-long, etc.

I wish to re-map an image taken with a Sigma 8mm 180 degree field-of-view fish eye lens. I have taken high-res images
of the sky with the lens pointing straight up and wish to convert these images to lat-long mapping (with 180 degree field-of-view this will give me data for the upper half of the 360x180 degree long-lat map)

So far I have used the 'mirrorball closeup' option in HDRShop when converting, but I have now made several experiments and measurements which show that interpreting the fish-eye-lens image as "mirrorball closeup" is incorrect. In fact the fish-eye-lens image seems to be identical to the hemispherical mapping used by RADIANCE when rendering with the -vth option.

I am searching for a piece of software which can convert from (cropped) fish-eye-lens image to mirrorball closeup (or directly to lat-long). Perhaps a plugin for HDRShop?

Best,
Claus

Sincerely,
Claus

2

Not sure where you see think the Mirrorball Closeup is wrong. When cropped right at the 180 deg circle, it fits the bill just fine.

A free alternative is using Hugin: http://hugin.sourceforge.net
Also, there's the Photoshop Plugin Flexify2 (which I prefer for workflow reasons): Flexify 2 Photoshop plug-in for panoramas, polyhedra, and maps - Flaming Pear Software

There's a tutorial on all three methods in my book, pages 282ff. Can get it on www.hdri-handbook.com or on SafariBooks.

Best,
Christian

ยทยทยท

On Dec 8, 2009, at 12:04 AM, Claus B. Madsen wrote:

Dear list members,

I use HDRShop to convert between mappings for environment maps, e.g., from mirror ball to lat-long, etc.

I wish to re-map an image taken with a Sigma 8mm 180 degree field-of-view fish eye lens. I have taken high-res images
of the sky with the lens pointing straight up and wish to convert these images to lat-long mapping (with 180 degree field-of-view this will give me data for the upper half of the 360x180 degree long-lat map)

So far I have used the 'mirrorball closeup' option in HDRShop when converting, but I have now made several experiments and measurements which show that interpreting the fish-eye-lens image as "mirrorball closeup" is incorrect. In fact the fish-eye-lens image seems to be identical to the hemispherical mapping used by RADIANCE when rendering with the -vth option.

I am searching for a piece of software which can convert from (cropped) fish-eye-lens image to mirrorball closeup (or directly to lat-long). Perhaps a plugin for HDRShop?

Best,
Claus

Sincerely,
Claus
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