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Re: [PanoToolsNG] Re: Stereo-3D Anaglyph Panoramas

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  • Luca N Vascon
    Any software writer out there?!?! I d like to mix panoramas with this thechnique http://www.david-laserscanner.com/ ... -- IUAV università degli studi,
    Message 1 of 61 , May 1, 2009
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      Any software writer out there?!?!
      I'd like to mix panoramas with
      this thechnique
      http://www.david-laserscanner.com/

      Roger D. Williams ha scritto:
      >
      >
      > On Fri, 01 May 2009 16:04:26 +0900, Wim Koornneef
      > <wim.koornneef@... <mailto:wim.koornneef%40gmail.com>> wrote:
      >
      > Hi, Wim!
      >
      > >> You mean you used two different cameras and lenses for the stereo
      > >> pair? I have two cameras to use with my two different lenses, but
      > >> thought this would be unusable for stereo panoramas.
      > >
      > > At first I thought this too, people always talk about the need of two
      > > equal setups but I had doubt if this was true so I did a test and I
      > > found out that it is possible to work with 2 different cameras with
      > > different lenses !
      > >
      > > Test it for yourself:
      > >
      > > Take a very sturdy tripod and a precise panohead, take a pano with each
      > > camera+lens combination of a static and controlled scene (same
      > light, no
      > > movements in the scene etc.) and take more images then usually to get
      > > approx. 50% overlap ( I shot 8 images with each camera+lens combination)
      > >
      > > Be absolutely sure that you don't move the tripod when changing cameras
      > > and make sure that each camera is mounted in the proper NPP. (I used a
      > > NodalNinja5 panohead with stoppers on the swingarm rail and my wife
      > > Margriet assisted me to hold the tripod in place).
      > >
      > > Then stitch a totally and carefully optimized pano of each set of
      > source
      > > images with the same equirectangular size.
      > > Put them in Photoshop in layers and make a comparison at 100% pixel
      > > level.
      > > I promise you will be supprised by the small pixel shift between both
      > > panos !
      >
      > Well yes, I promise to be surprised! This ignores the effects of quite
      > different second-order lens distortion, so I suppose this must be
      > negligable. Surprising! Although come to think of it, I used to shoot
      > with both eyes open, one eye looking through the SLR with the zoom
      > set to 1:1 and the other looking at the scene itself. This was a great
      > help in framing for someone used to a bright-line finder, as I was,
      > and the bonus was that I saw everything in 3D. I'll bet there was more
      > difference between the two images my eyes were seeing than between
      > two panoramas properly optimized.
      >
      > > The maximum shift between the panos I noted in my test was just 2
      > > pixels...
      > > Keep in mind that the left and right pixel shift in the anaglyphs (or
      > > the colorcode3D) images is far more then a few pixels and that explains
      > > why it is possible to use 2 different cameras with different lenses.
      >
      > I am encouraged. It means I can try taking some myself.
      >
      > > BTW, the method for using 2 cameras with different lenses is copyright
      > > 2009 - Wim Koornneef - dmmdh productions !!
      > >
      > > No just kidding, take your advantage and please feel free use the
      > method
      > > :-))
      >
      > <Wry but appreciative grin!>
      >
      > >> Using a bar with two cameras necessarily means that both cannot be
      > >> revolving about their non-parallax points. Do you find that greatly
      > >> affects stitching, generating errors in the final panorama?
      > >
      > > Yes, the out of NPP shooting gives a lot of problem when shooting and
      > > stitching the "normal" way.
      > > The solution is to shoot a lot more images then usual, how many "more"
      > > depends on the distance to nearby objects.
      > > When the distance is at least 1.5 meter 25 images for each camera will
      > > do but when the distance is less then you have to take much more
      > images.
      > > In one of my tests I had to shoot 72 images to avoid errors close to
      > > nadir but in this case the ceiling was only 70cm away from the
      > camera....
      > > In practice I shoot 50 images around and use only 25 of them, when
      > > needed (to much errors in one or more seems) I put one or more extra
      > > images in the row to solve the error.
      > > To output the panos as layers is the second best option that I like
      > > avoid because it is a hell of a job to retouche errors in 2 panos in
      > > such a way that there is no visible trace of it in the 3D output.
      >
      > This is depressing. I moved to fisheyes because I hate stitching
      > multiple images, and four-around or six-around is about my limit. But
      > I can believe you about the pain of retouching two panos for stereo
      > vision. No thank you!
      >
      > I seem to remember something said about taking many photos on the way
      > around the 360 degrees and using only a narrow, central, "slice" of
      > each to make stitching more successful. And I suppose that a rotating
      > slit camera (I have one, and used it exclusively for 360-degree
      > panoramas until I learned to stitch them) is the ultimate in this
      > respect. There might be a way to use a slow-panning movie to
      > create a good-looking panorama even if it was not actually rotating
      > around the NPP. The image might look quite good but of course the
      > parallax effects would introduce some distortion into the things at
      > first partially hidden and then gradually revealed as the camera
      > turned. I can imagine it, but I'd like to see how it looks... And
      > you would still need two cameras locked and turning together. You
      > couldn't have the same camera turning about two different centers
      > of rotation--the left and right images would be interchanged at
      > the 180-degree point! Ha, ha!!
      >
      > Roger W.
      >
      > --
      > Work: www.adex-japan.com
      >
      >

      --
      IUAV università degli studi, Venezia

      Dr. Luca Vascon
      tel . (+39) 041.2571262, e-mail vascon@...

      laboratorio multimedia Facoltà di Design e Arti, DADI
      Magazzino 7 ex Ligabue, Dorsoduro 1827 30123 Venezia
    • Karol Kwiatek
      Hi, Do you have a script for creating stereo-anaglyph panoramas in 3D modelling software (3D studio Max or Maya)? Karol
      Message 61 of 61 , May 10, 2009
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        Hi,

        Do you have a script for creating stereo-anaglyph panoramas in 3D modelling software (3D studio Max or Maya)?
        Karol
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