Ryan Popa
Posts: 58
Location: Romania
Registered: 31 Mar 2011
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how to fit nadir in this pano
Posted: 2 Nov 2011 at 1:15 GMT
updated: 2 Nov 2011 at 1:16 GMT
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I have the following images. I try to get a nice nadir, but no luck.
problem:
1) if I just stich the images and use hugin mask, I get points where the stiching is wrong
2) if I try to remove the tripod in photoshop, I end up with differences in luminosity which I don't know how to handle ...
can somebody please tell me how to do this? I need to do this for another 20 panoramas, so I really need some help.
Thank you
www.panonest.com/question.zip
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Vilmer
Posts: 451
Location: Argentina
Registered: 23 May 2007
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Re: how to fit nadir in this pano
Posted: 2 Nov 2011 at 2:03 GMT
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zip file is damaged.
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Marco W
Posts: 111
Location: Bali, Indonesia
Registered: 12 Feb 2010
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Re: how to fit nadir in this pano
Posted: 2 Nov 2011 at 2:05 GMT
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Differences of Luminosity and brightness can be solved with an adjustment layer in Photoshop (Exposure, Levels, Curves and/or Highlight Contrast Layers) and masking these adjustment layers for the concerned area's.
For a tutorial and explanation about Adjustment Layers, read this; psd.tutsplus.com/articles/techniques/a-basic-guid...
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Ryan Popa
Posts: 58
Location: Romania
Registered: 31 Mar 2011
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Re: how to fit nadir in this pano
Posted: 2 Nov 2011 at 10:26 GMT
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please try again, I reuploaded the archive. I would appreciate you looking trough the photos, maybe trying to stich them to see what's wrong. Thank you
www.panonest.com/question2.zip
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Tactus 360
Posts: 1245
Location: Tynset, Norway
Registered: 2 Sep 2010
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Re: how to fit nadir in this pano
Posted: 2 Nov 2011 at 11:13 GMT
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There is nothing wrong, per se, but the big problem is the lack of anything in the nadir to stitch. It is problemmatic stitching a nadir like this, since their is little to latch onto.
I stitched images 1-4 and the last, and ignored the two -90-degree images. That was done quite fast, without too much attention to the nadir; it was not perfect, but with a little time, the nadir would have fitted in perfectly.
The images are very soft and you might do well to sharpen them a little before trying a stitch.
Send me a pm and I will email you the template.
Jon
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John Houghton
Posts: 3487
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
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Re: how to fit nadir in this pano
Posted: 2 Nov 2011 at 20:09 GMT
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Tactus 360 said: There is nothing wrong, per se, but the big problem is the lack of anything in the nadir to stitch.
Quite the opposite; there is masses of detail at the nadir. There's a regular pattern of dots perfectly visible in the floor covering. Difficult for an automatic control points generator, but not too difficult for manual assignment, assisted by automatic jumping to the matching dot. This works ok provided you use good lens parameters. You can also use t3, t4 ... points to straighten the lines of dots at the nadir to aid alignment. The really difficult part is the blending, and the elimination of the unfortunate shadow of the outstretched arm holding the camera for the nadir shot. Getting a really clean blend at the nadir that withstands close scrutiny is far from easy. I did my tests with PTGui rather than Hugin, so my project file isn't much use to Ryan. Photoshop's transform tools and content aware fill optionss are useful for fixing the problems, but they don't always work as well as one would like.
BTW - the setup of the panohead needs tweaking as the bottom rail lateral setting is a few mm from optimum.
John
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Ryan Popa
Posts: 58
Location: Romania
Registered: 31 Mar 2011
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Re: how to fit nadir in this pano
Posted: 2 Nov 2011 at 20:17 GMT
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thank you for your response.
1)Did I make any mistake when taking the photo?
2)What do you mean by t3,t4?
3)how did you figure out the bottom rail was not in the right position? I try to eliminate the paralex as much as possible, but it looks like I still need to work on it..
thank you
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hindenhaag
Posts: 729
Location: Netherlands
Registered: 7 Mar 2010
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Re: how to fit nadir in this pano
Posted: 3 Nov 2011 at 6:22 GMT
updated: 3 Nov 2011 at 6:24 GMT
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Ryan,
I also did my test with PTGui Pro as John did.
I feel there might be a mistake in your workflow. The Nadir shot be shot in the same position as your first shot. Always start at 0° and work to the right to be sure of the situation taking a lot of shots per row.
This would mean you take your for shots around. Then, to get back to first shot position, move to 0° and set the camera to -90° to shoot Nadir1. Turn Rotator by 180° to the other side for Nadir.
This way your first shot has the bed on top of the picture as well as Nadir1/2. Your Nadir shots are turned by 90° to the first shot. PTGuiPro can heal this by choosing viewpoint correction. In cases like this I first stitch the 4 shots around. Then I added the masked Nadir shots. I got stitching errors in the door of the bathroom for example. So you have to mask out not only the tripod, but may be for example part of the door in the bathroom as well to avoid stitching errors. But I do not know what happens in Hugin.
To deal with the shadow in the handheld, besides using PS you could take a second handheld having moved aside to free the shadow of the arm in the first shot. then you mask the shadows as well.
T3 T4 is the possibility in PTGuiPro to change the sort of control points. You can change it to tell PTGui which lines are completely straight in vertical or horizontal. Visit John's site to see the tutorial.
www.johnhpanos.com/horizons.htm
Regards,
Heinz
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John Houghton
Posts: 3487
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
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Re: how to fit nadir in this pano
Posted: 3 Nov 2011 at 7:02 GMT
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hindenhaag said: This way your first shot has the bed on top of the picture as well as Nadir1/2. Your Nadir shots are turned by 90° to the first shot. PTGuiPro can heal this by choosing viewpoint correction.
The nadirs can be taken at any angle of yaw you like, so viewpoint correction is not needed to "heal" this. OTOH, viewpoint correction can be employed to deal with the lower rail mis-setting, which causes the parallax error shown in this animation:
The straight line control points (t3,t4,...tn) are better described in this guide to the optimizer:
www.johnhpanos.com/optitute.htm
In this project, they can only be used on a temporary basis when the output is selected to display the nadir in rectilinear projection. After optimization, the output needs to be restored to the usual 360x180 equirectqangular format, and the line points deleted. The lens parameters should not then be further optimized. PTGui's normal optimizer does not support the line points, so the alternative Panotools optimizer must be used for this.
John
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