burake
Posts: 286
Location: Antalya, Turkey
Registered: 7 Jun 2012
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nadiradapter vs.viewpointcorrection
Posted: 7 Feb 2013 at 6:29 GMT
updated: 7 Feb 2013 at 6:29 GMT
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Hi,
Here are screenshots from the nadir in two panoramas at the same place...In the first one the nadir shot was made with using nadiradapter and a very slight change of the place where the tripod was standing (it was an attempt to get rid of the overlapping area of one of the legs of the tripod - but not very well suceeded as you can see ).. I used view point correction...In the other panorama for the nadir shot I didn't care about NPP and moved the tripod more away...I did a nadir shot at an angle of about 45 degree, I just wanted to have a picture which covered all the nadir area...Here of course I used also view point correction...The same stitching results of 0,66 average and 2,80 max.(actually in the same project I just changed the two nadir shots)...But one can see the difference in stitching/blending results...
ge.tt/1eCc4iX/v/0?c
Regards
Burak
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Smooth
Posts: 4014
Location: Mount Panorama, Australia
Registered: 21 Jul 2004
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Re: nadiradapter vs.viewpointcorrection
Posted: 7 Feb 2013 at 7:05 GMT
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Burak,
It is not a case of one versus another. Both are typically used in conjunction with each other. You must be mindful of the tripod leg position when shooting and in use with the Nadir adapter. The Nadir adapter can be use to simply shot the 45° angle back over the scene.
At times using the VPC is not possible due to uneven surface. This is where using the Nadir adapter comes into it's own. So long as you keep the NPP as close as possible, always being mindful of shadows and tripod leg position.
Regards, Smooth 
www.omnipix.com.au
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John Houghton
Posts: 3710
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
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Re: nadiradapter vs.viewpointcorrection
Posted: 7 Feb 2013 at 8:55 GMT
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burake said: But one can see the difference in stitching/blending results...
One can certainly not miss the obvious transition in sharpness between the sharp nadir shot and the fuzzy surrounding shots. I imagine some intelligent masking to render the whole of the mat from the nadir image would look a lot better.
There are two main drawbacks when shooting from a large oblique angle:
1. Inconsistent floor shine. Reflections in glossy and lustre surfaces move about with changing viewpoints and so don't align when the floor itself is correctly aligned.
2. Near and far resolutions in the nadir shot can be very obviously different when the remapped viewpoint image is merged in with the surrounding images, particularly in the case of a fisheye lens. Avoid capturing the far distance at the edge of the fisheye image circle where the image quality falls off.
As Smooth says, it's much more important to maintain the NPP when the floor isn't flat (which may be difficult anyway when sliding the tripod about even when using the nadir adpater). In the special case of stepped surfaces, you can include a single nadir shot in the stitch more than once and mask surfaces at different levels, aligning each with its own individual vp correction. It's then an advantage to shift the tripod away from the NPP slightly, to ensure a more complete view is obtained over the edge of a step to facilitate masking.
John
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DennisS
Posts: 1624
Location: Los Anglels, United States
Registered: 1 Sep 2007
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Re: nadiradapter vs.viewpointcorrection
Posted: 7 Feb 2013 at 10:45 GMT
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Burake,
I also agree that it is not which is better, but when to use each one. I turn on Viewpoint Correction for all my Nadir patch shots, no matter how the image was captured. It is a case of which technique yields the best results for any given panorama. In your example, once you learn how to position the tripod, the Nadir adapter should yield better results than the offset method, simply because of the reflections off of the tiles.
Another technique is to lean the tripod over, extend the third leg, secure the leg with your foot and take the Nadir patch shot.
Yet another is to hand hold the camera out at arms length.
And there are many more.
The more techniques you master the more difficult panoramas you will be able to shoot.
Keep on doing comparisons. Get good at many techniques.
Dennis
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burake
Posts: 286
Location: Antalya, Turkey
Registered: 7 Jun 2012
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Re: nadiradapter vs.viewpointcorrection
Posted: 8 Feb 2013 at 16:51 GMT
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Thanks a lot for all the good advice...
Burak
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