My "Stepped-out" Panorama

Discussion in '35mm Cameras' started by Annika1980, Jul 14, 2008.

  1. Annika1980

    Bates Guest

    While I would love to participate in all the inane conversation going
    on, I actually thought it might be interesting to learn something (and
    by that I mean: I would like to learn something). Can someone here
    please define for me a "Stepped-out" panorama? I've tried (with only
    modest success so far) to create panoramas. I've tried it two ways -
    one by simply rotating in one spot and the other by physically moving
    parallel to the object of interest while taking the shots. Is
    "stepped-out" something different again? It sounds to me like you
    actually move away from the subject of interest - but I from the
    examples shown here in this thread, I'm thinking it is more like what
    I mentioned before - moving parallel to the object of interest and
    taking all shots directly perpendicular to the object.

    Thanks in advance

    Bates.....
     
    Bates, Jul 15, 2008
    #41
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  2. How is it compared to Arcsoft Panorama Maker 4, do you know?

    I'm using that because it comes free with Nikons, and it's worked very well
    for me (relatively modest use), but I'm always willing to try something else
    if it's better.

    Neil
     
    Neil Harrington, Jul 15, 2008
    #42
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  3. Stay out of aus.photo! Noons don't like 'merikans.
     
    John McWilliams, Jul 15, 2008
    #43
  4. Annika1980

    Annika1980 Guest


    I give less than a **** what Noons likes.
     
    Annika1980, Jul 15, 2008
    #44
  5. That's evidently what "stepped-out panorama" means. . . . The expression was
    new to me too.

    As for the more conventional method, rotating in one spot, it's fairly
    important to rotate the camera in one spot, not yourself. Technically the
    correct point around which to rotate is the first nodal point of the lens,
    which can be found by (slightly tedious) experiment. It can generally be
    assumed to be somewhere behind the front element, and while a bit vague
    that's usually close enough unless there are objects quite close in the
    picture.

    Neil
     
    Neil Harrington, Jul 15, 2008
    #45
  6. Annika1980

    Scott W Guest

    You pretty much have it.

    To start with “stepped out” is not what it is really called, linear
    panorama is what everyone is talking about, it seems it was D-Mac who
    coined the term stepped out.

    In a normal stitched panoramic shot you want to be very careful to
    rotate the camera around the nodal point of the lens, this is to avoid
    parallax. Parallax is a problem when you have objects at different
    distances to the camera, if the camera shift position between shots
    then the foreground objects will shift from shot to shot compared to
    the background.

    In cases where the object being photographed is all about the same
    distance to the camera you can shift the camera as you take the
    photos. A good example of this is the stitched images on Google Earth,
    the shots are taken at a fairly high altitude and so there is little
    parallax problem.

    Scott
     
    Scott W, Jul 15, 2008
    #46
  7. Duh.
     
    John McWilliams, Jul 15, 2008
    #47
  8. You have a lot of that to give I assume?

    Cal
     
    Cal I Fornicate, Jul 15, 2008
    #48
  9.  
    John McWilliams, Jul 16, 2008
    #49
  10. Annika1980

    m II Guest

    Well, internet tough guy,...how many pictures did you steal today?

    Judging by your vocabulary, I'd say you will be going to Grade eight
    this fall. Again.



    mike

    --
    Due to the insane amount of spam and garbage,
    this filter blocks all postings with a Gmail,
    Google Mail, Google Groups or HOTMAIL address.
    It also filters everything from a .cn server.

    http://improve-usenet.org/
     
    m II, Jul 16, 2008
    #50
  11. So many toughies out today!
     
    John McWilliams, Jul 16, 2008
    #51
  12. Hmm, I'd think it would be a fairly unique endeavor. Since we observe the
    world from a single point, most work in art and photography is concerned
    with replicating that experience. But the stepped out idea creates an image
    that doesn't correspond to any view; it's wrong from wherever you observe
    it. And Annika's example shows that. (As ScottW points out, this only really
    works when the subject is essentially flat, and that wouldn't really count
    for this discussion.)
    So what programs support it? (Specific references, please.)

    I wonder if anyone has made a moving-slit camera that can be moved along a
    rail with a vertical-slit focal plane shutter synchronized to the rail
    movement; sort of a linear version of the swing-lens panoramic cameras?

    David J. Littleboy
    Tokyo, Japan
     
    David J. Littleboy, Jul 16, 2008
    #52
  13. Annika1980

    Paul Furman Guest

    Bolt a flatbed scanner on the back of a big view camera... I saw a web
    page where someone did that & produced a strange image of an automatic
    garage door opening (bent) during the exposure.

    --
    Paul Furman
    www.edgehill.net
    www.baynatives.com

    all google groups messages filtered due to spam
     
    Paul Furman, Jul 16, 2008
    #53
  14. Annika1980

    Scott W Guest

    PTGui pro supports it.

    Mainly for adding in the nadir image of a 360 VR, this lets you shoot
    without the tripod for the straight down shot. But it also works well
    for linear pans, in fact it works for any flat surface.

    Scott
     
    Scott W, Jul 16, 2008
    #54
  15. But that kind of artificially view-point-free image has its well
    established uses, such as in mapping. It's interesting that in the
    history of drawing and painting the use of perspective to give
    realistic viewpoint specific imagery was a very late development. And
    the whole business of the "correcting converging verticals" in real
    estate and architectural photography is a clue to the fact that
    contrary to the popular view what we see isn't a simple derivation
    from the optical geometry of the eye in the manner of a camera image,
    but is a brain-massaged projection.
     
    Chris Malcolm, Jul 16, 2008
    #55
  16. That's used in machine vision labs in such devices as laser scanning
    to build 3D images, although they ofetn move the object along the rail
    under the camera rather than the other way round. Something like it
    also takes places in some kinds of modern medical 3D scannery.

    But as usual software is once again overtaking mechanics -- smart
    software can now integrate such sequential images without needing them
    to be precisely stepped, because the software works out the steps from
    overlapping image comparisons. In fact theoretically you could now
    build up a 3D image of the interior of a building by hiring a kid to run
    through it while swinging a video camera round his head on a string
    :)
     
    Chris Malcolm, Jul 16, 2008
    #56
  17. Annika1980

    Annika1980 Guest

    Serious question for D-Mac/Indigo Blue/Nice Mice/Cryptopix/Alienjones/
    whatever:

    Do you think DxO would help with the pre-processing of the images
    prior to stitching?
     
    Annika1980, Jul 16, 2008
    #57
  18. A photofinish camera. The mechanism is a bit other in that the film
    moves past a slit in synchronization with whatever is moving.

    For horse racing the camera remains stationary and the slit is focused
    on the finish line. The film speed is set so a horse racing by won't
    get stretched or shrunk. You get a picture of the finish line with
    time on the horizontal axis - by measuring horizontal distance you can
    determine when items cross the finish line.

    For making an orthogonal image of a street, say, you would move the
    camera with the film speed set so that things come out in the right
    perspective.

    There's a prof at RIT who plays around with this.

    http://people.rit.edu/andpph/
     
    Nicholas O. Lindan, Jul 16, 2008
    #58
  19. Annika1980

    Bates Guest

    Thanks Neil,

    Actually - I should have (but honestly did not) realise that the
    camera should be rotated rather than myself. Would explain some of my
    results. Duh....

    Thanks again - who'da thunk you could learn something on a newsgroup?

    Bates....
     
    Bates, Jul 16, 2008
    #59
  20. Annika1980

    Bates Guest

    Cool. Again, thanks! I appreciate the pointers on the rotation as
    well. Can't wait to go home and try some new shots....

    Bates
     
    Bates, Jul 16, 2008
    #60
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