Tiziano
Posts: 20
Location:
Registered: 9 Nov 2012
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Troublesome First Stitch
Posted: 21 Nov 2012 at 14:30 GMT
updated: 21 Nov 2012 at 14:59 GMT
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For my first panorama I think I came up with the impossible. I shot a room, called The Atrium, at a local private school. Of the four sides of the room, two are very close to being identical. So close in fact that PTGui consistently places control points on image pairs which do not overlap in the real world. It took me three hours to realize that was what was going on! I've added two of the shots below, from opposite sides of the room.
I've tried, from the beginning (Load Images), about 20 times. I then change the PTGui defaults to full frame fisheye and it automatically tells me that the lens is a 5.5mm at 1.523x. I try 8mm, 9mm and 10mm (including some non-integer values) but each time PTGui gives me mixed up control points for images that in the real world do not overlap. After I Align Images, PTGui changes the focal length to 5.35mm all on its own. The first image below is a screenshot of PTGui's Align Images attempt.
Once I went so far as to delete 100s of control points on the offending overlaps and then overlapped the correct images. I then optimized and it throws an error which it politely tells me is 'very bad'.
Being a neophyte at panoramas this naturally has me stumped. Should I try to do each side of the room, independently, and then stitch the two sides together?
Or. . ?
FWIW my gear is:
Nikon D90 w/Rokinon 8mm Fisheye and a NN3 MKII with an RD-16II
A very stable Manfrotto tripod (I forget the model but it's huge and rock solid)
I screwed the NN/RD16 directly to the top of the tripod column, which was set all the way down in the tripod so it was very stable
The camera/lens is aligned so as to have zero parallax
Portrait orientation
6 shots around @ -10 degrees, 2 shots up (opposite) @ +60 degrees
2 nadir shots (opposite) using the NN nadir adapter
At all rotations the level on the NN stayed dead center
Camera set on manual, focus on manual
All shots were bracketed (3 times @ 1EV) in RAW, then into Lightroom to defringe and export as 16 bit TIFFs. I only used one of each however and they were all of the same exposure setting
Loaded into PTGui Pro, v9.1.6
I can provide all images from the set I loaded into PTGui if necessary but perhaps my writeup and the two images below will give an idea of my problems?
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Tiziano
Posts: 20
Location:
Registered: 9 Nov 2012
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Smooth
Posts: 4014
Location: Mount Panorama, Australia
Registered: 21 Jul 2004
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Re: Troublesome First Stitch
Posted: 21 Nov 2012 at 15:05 GMT
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You bring the images into PTGui as 9mm
Do NOT auto align images.
Go to the Control Point Tab and select image 0 in the left pane and image 1 in the right. Then with your keyboard hit Ctrl+Shift+G. This will add control point ONLY to the images in the panes showing. Then move on to the next overlapping image pair. I.E: 1 + 2, 2 + 3 etc.
Run the optimizer (advance mode) when done after checking the boxes FOV, A, B, C, Horizontal Shift and Vertical Shift.
Regards, Smooth 
www.omnipix.com.au
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Tiziano
Posts: 20
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Registered: 9 Nov 2012
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Re: Troublesome First Stitch
Posted: 21 Nov 2012 at 15:21 GMT
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Thanks!
It looks like I have some work to do.
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enbilaman
Posts: 143
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Registered: 3 Mar 2006
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Re: Troublesome First Stitch
Posted: 21 Nov 2012 at 15:42 GMT
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Tiziano said: 6 shots around @ -10 degrees, 2 shots up (opposite) @ +60 degrees
2 nadir shots (opposite) using the NN nadir adapter
Loaded into PTGui Pro, v9.1.6
I can provide all images from the set I loaded into PTGui if necessary but perhaps my writeup and the two images below will give an idea of my problems?
Using the NN nadir adapter is a fine solution to get rid of the obstruction from the panohead and from the tripod legs on the nadir... while it's not mandatory: www.ptgui.com/examples/vptutorial.html but then if you use it, you must correct the shot(s) by means of the ViewPoint correction feature of PTGui Pro. If not, inevitable stitching problem shall occur. The NPP was certainly not set in a way to consider these 2 images as "true normal nadir" shots. BTW only one such a "Viewpoint corrected" nadir shot is usually required.
Michel
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Tiziano
Posts: 20
Location:
Registered: 9 Nov 2012
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Re: Troublesome First Stitch
Posted: 21 Nov 2012 at 17:29 GMT
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Thanks Michel.
So, while the NNP is correct for the main shots (bearing in mind that it's a fisheye), it would be different for the nadir even with the nadir adapter?
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hindenhaag
Posts: 844
Location: Netherlands
Registered: 7 Mar 2010
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Re: Troublesome First Stitch
Posted: 22 Nov 2012 at 1:26 GMT
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Hi Tiziano,
use apply template in PTGui:
ge.tt/6l4Zl6S/v/0
Top tab before "align": apply template. Copy the template file in your "default folder for templates" under PTGuiPRO >Preferences>Files and Folders.
Please send set of pics in ge.tt.
Setting camera lens parameter in PTGui: lens type set "manual" to Full Frame Fisheye. In "optimizer" >Advanced set "lens distorsion" to Heavy + lens shift and then run optimize.
Wrong camera lens parameters often result in a stitch like yours.
Heinz
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kasenyee
Posts: 73
Location: Toronto, Canada
Registered: 22 Jun 2012
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Re: Troublesome First Stitch
Posted: 22 Nov 2012 at 2:53 GMT
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I find it's faster to delete control points than to add them. When i come into this type of problem, i just align, go to control points, select all the points that are not from a neighbouring image and delete them. I find it's a much faster method.
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Tiziano
Posts: 20
Location:
Registered: 9 Nov 2012
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Re: Troublesome First Stitch
Posted: 23 Nov 2012 at 19:10 GMT
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OK guys and gal, I've finally succeeded!
jmtype.com/pa/PA-Atrium_1.html
Thanks to all for the help.
Heinz, I'm grabbing the template now so that I can compare it to what I have.
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burake
Posts: 284
Location: Antalya, Turkey
Registered: 7 Jun 2012
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Re: Troublesome First Stitch
Posted: 23 Nov 2012 at 21:52 GMT
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Looks very fine...Congratulations...
Burak
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Tiziano
Posts: 20
Location:
Registered: 9 Nov 2012
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Re: Troublesome First Stitch
Posted: 24 Nov 2012 at 3:22 GMT
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Thanks!
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