panorama software,virtual tour software
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Joined: 2009-09-25
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Posts: 17
2009-09-26
#1

Horizontal field of view?

I posted earlier, here a better explanation. When stitching, they get jumbled. Is it related to the horizontal field of view setting in pw? If not, what could it be?

Source:
http://www.smartyoung.com/public/not-password-protected/360/pwsource.JPG

Result:
http://www.smartyoung.com/public/not-password-protected/360/pwresult.JPG

Using Panoweaver 6.00.090804, Nikon D300, Sigma 28-70mm F2.8 EX DG lens, Manfrotto rotator.

 


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Joined: 2002-11-23
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Posts: 5438
2009-09-27
#2
Panoweaver 6.0 is the first release that allows multirow type stitching from rectilinear lenses. All previous versions were fisheye lens only.

I have never used it for this purpose. So others may be more use to you answering this question.

Do you know what the FOV of your images are? If so type this in and stitch again. It is highly unlikely that this will be an automatic stitch so be prepared to add manual control points.

How accurate is your NPP setting?

Regards, Smooth
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Joined: 2009-09-25
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Posts: 17
2009-09-27
#3

Thanks. I got a fully automated stitch as described below, but I don't understand why.

About your questions: It is one single row with 18 pics (not multirow). I did a guesstimate at npp thinking parallax issues would be limited with objects mostly far away and many images next to each other in the horizontal plane, each 20 degrees apart (360/18). This is guessing on my behalf.

In any case I tested a random number in hor fov (I think 30 instead of 50) and that did the trick for the stitch in pw6. But the logic behind what value to put here is beyond me and I'm hoping someone can explain this.

The lens data (Sigma 28-70mm F2.8 EX DG lens) states angle of view 75.4 - 34.3. The lens was "zoomed out" so I'm guessing that gives 34.3 for hor fov? However, I had placed the camera body vertically on the rotator and perhaps this would give yet another hor fov value identical to the vertical fov of the lens unless pw6 considers the "long" side of the picture to be "horizontal" regardless of me rotating the camera body? I couldn't find a vertical fov value for the lens at the sigma web site, perhaps this is not a term thats used.

I also tried the stich in the demo version of ptgui pro and got it right at the first try. I wonder how it can now the hor fov value since it seems to be needed. From exif data? Exif data states "Focal length: 28mm" and "Focal length in 35mm film: 42mm".

Hope someone can shed a light!