Clay
Posts: 251
Location: Port Colborne, Ontario, Canada
Registered: 23 Aug 2004
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Reverse Engineer an Equilateral?
Posted: 1 Feb 2012 at 22:04 GMT
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Does anyone know how to "reverse engineer an equilateral"? I would like to convert some of my equilateral images back to their original source images. I use PTgui, and assume that knowing the lens parameters of the stitch would help.
Clay
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John Houghton
Posts: 3487
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
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Re: Reverse Engineer an Equilateral?
Posted: 1 Feb 2012 at 22:27 GMT
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Clay, Well that's an original query, I must say. It's not too difficult to generate "perfect" camera images, i.e. free of distortions, but to generate images very close to the original images is a tall order. What do you want to do with the generated images?
John
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DennisS
Posts: 1292
Location: Los Anglels, United States
Registered: 1 Sep 2007
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Re: Reverse Engineer an Equilateral?
Posted: 1 Feb 2012 at 23:08 GMT
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That's easy. Run PTGui in reverse!
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DorinDXN
Posts: 2853
Location: Timisoara, Romania
Registered: 14 Nov 2006
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Re: Reverse Engineer an Equilateral?
Posted: 2 Feb 2012 at 8:42 GMT
updated: 2 Feb 2012 at 8:44 GMT
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Hi Clay, you can generate rectiliniar/fish eye images back from the equirectangular with overlap but will not be the overlap from the original images. Some of that info is lost for good as the blender, when joins images into equirectangular, keeps and blends some parts and left other parts of one of the overlapping images out.
As a procedure will be close with what I posted couple of years back here in the forum when I posted how to show your panoramas on your camera's display, but, as usual, with no interes at all from the readers.
cheers,
Dorin
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Clay
Posts: 251
Location: Port Colborne, Ontario, Canada
Registered: 23 Aug 2004
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Re: Reverse Engineer an Equilateral?
Posted: 2 Feb 2012 at 16:54 GMT
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DorinDXN said: Hi Clay, you can generate rectiliniar/fish eye images back from the equirectangular with overlap but will not be the overlap from the original images. Some of that info is lost for good as the blender, when joins images into equirectangular, keeps and blends some parts and left other parts of one of the overlapping images out.
As a procedure will be close with what I posted couple of years back here in the forum when I posted how to show your panoramas on your camera's display, but, as usual, with no interes at all from the readers.
cheers,
Dorin
I did a search for posts on this but didn't come up with your thread, can you point me to it, please, Dorin?
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John Houghton
Posts: 3487
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
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Re: Reverse Engineer an Equilateral?
Posted: 2 Feb 2012 at 17:17 GMT
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Clay, If you could explain what it is that you are wanting to do in a little more detail, more constructive help would be possible. If you input a 360x180 equirectangular image to PTGui and specify the lens type as equirectangular with a fov of 360, you can then select views from that for output in rectilinear/fullframe/circular fisheye formats that simulate images that a camera would capture. The required view is set up in the Panorama Editor window by shifting the panorama image around with the numerical transform option (more accurate than simply dragging the image manually).
John
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Vilmer
Posts: 451
Location: Argentina
Registered: 23 May 2007
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Re: Reverse Engineer an Equilateral?
Posted: 2 Feb 2012 at 17:51 GMT
updated: 2 Feb 2012 at 17:54 GMT
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It's a way to upload quality images to the automated stitcher for 'google shopview'.
If you first stitch the images yourself, and apply hdr / fusion /what ever you need to make a perfect image, and convert them back to circular images, you just might be able to feed google with a better quality pano's than the crap they are showing now.
(you cannot upload equirectangulars to google)
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DennisS
Posts: 1292
Location: Los Anglels, United States
Registered: 1 Sep 2007
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Re: Reverse Engineer an Equilateral?
Posted: 2 Feb 2012 at 19:19 GMT
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Do your HDR work on the individual images prior to stitching. No backwards engineering needed.
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Vilmer
Posts: 451
Location: Argentina
Registered: 23 May 2007
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Re: Reverse Engineer an Equilateral?
Posted: 2 Feb 2012 at 19:57 GMT
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True,
ofcourse you can also think of fotoshopping on both side of the seams and nadir patching.
In short, things that google's automated stitcher doesn't do.
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