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Partial stereo panoramas -- single shot processing

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  • panovrx
    Stick two fisheye equipped DSLRs together and you can shoot good partial stereo panoramas (up to about 150 degrees) in a single shot. Some DSLRs can be sycned
    Message 1 of 1 , May 16, 2009
      Stick two fisheye equipped DSLRs together and you can shoot good partial stereo panoramas (up to about 150 degrees) in a single shot.
      Some DSLRs can be sycned perfectly by simply wiring two cable releases together (Canon 5Ds work well).

      The next step is to align them (to minimize vertical disparities and set the depth of the scene relative to the screen frame). If you load the two fisheye shots into Stereophoto Maker to do this using autopano it will not do a good job and you probably do not want fisheye perspective anyway. What I have tried with reasonable success is this:
      convert to 140 degree square rectilinear images with PTGui. Align these with Stereophoto Maker. The autoalign works fine even with these ultra wide angle rectilinear pairs. Export from Stereophoto Maker and load these aligned rect images into PTGui and export as equirectangular, cylindrical, or Vedutismo say. Load these aligned exports into Stereophoto Maker and run autoalign again.
      Each step just takes a few seconds.

      These eg. are with 2 Canon 5D/shaved Nikkor 10.5mm
      http://www.mediavr.com/vedutismo140a.jpg
      http://www.mediavr.com/vedutismo140simplify.jpg (with Topaz Simplify)

      This is Vedutismo 140 degrees wide with some horizontal compression in PTGui.

      This is with two 5D cameras horizontal as close to one another as you can put them (ie. about twice eye separation). This works ok disparity wise for this kind of scene depth for anaglyph or shutter glasses but is too much disparity for some kinds of display scenarios
      (eg. Iz3d screen). Mounting the cameras vertically you can get them much closer (base to base).

      It is obvious that fisheye single shot capture will not work properly for scene detail at the periphery of a 180 degree fisheye as then the two lenses have no horizontal disparity and the disparity is reduced progressively to zero as you move from the centre of the frame to the edge. But for many scenes it works ok up to about 150 degrees I think.

      Twin 5Ds with shaved 10.5mm Nikkors is good for timelapse 360s too -- -- set to point in opposite directions -- as I have described before.

      Peter M
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