3D Depth Adjustment

Discussion in 'Amateur Video Production' started by Gary Eickmeier, Apr 16, 2013.

  1. I have wondered what the 3D depth adjustment on my Sony 3D camcorder was
    actually doing. Does anyone else out there care about this? Sometimes the
    Auto Adjustment doesn't work, and I attempt a manual adjust, but I am not
    sure what I am doing, what it does. The two images can be made to converge,
    but where should they converge - on this subject or that? But no matter what
    I do, it never seems to screw up the 3D effect on playback, i.e. it always
    works, so what is going on there?

    I think what it is is just at which point do you want screen dept to occur.
    In 3D, the point at which the objects appear at screen depth is where they
    converge in the viewfinder. Anything deeper or closer to you than screen
    depth will diverge in the frame. So the adjustment determines how "deep" you
    want that point to be. If you make the images converge at Johnny, then
    anything or anyone closer than Johnny will appear to stick out from the
    frame, anything farther will recess from screen depth. You can never make
    infinity converge at screen depth, because that would make no sense.

    Sound reasonable?

    Gary Eickmeier
     
    Gary Eickmeier, Apr 16, 2013
    #1
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  2. Having never done the above (but having made MANY 3D
    still images for my web site (some examples are here:
    http://www.donferrario.com/ruether/video-4.htm
    http://www.donferrario.com/ruether/video---1.htm
    http://www.donferrario.com/ruether/video---5.htm
    http://www.donferrario.com/ruether/video----5.htm ),
    I gather that the idea is to place the frame edge in
    the same location in each image for the frame to be
    the proper reference location for the content. In even
    less clear "speak", the edges should frame the two
    images the same way... Ain't it gran' when we dare
    to "guess" in public? 8^) These, uh, don't really
    follow the above, though.....;-) They were made by
    shooting one still with a video camera, then moving
    it sideways a few inches (trying to remember the
    framing and aiming...) and then taking another photo.
    As you can (maybe...;-) see, even with considerable
    errors, there can still be a clear 3D effect. The
    frame edges may not exactly correspond with each
    other, though.

    --DR
     
    David Ruether, Apr 16, 2013
    #2
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  3. Hi David -

    Seems to me the frame edges will be the same on only the screen depth plane.
    The objects at infinity cannot have the same screen depth OR framing, or
    else infiinity would appear right on top of you, which is not desirable. But
    if Johnny is what you want at screen depth, then he will be framed
    identically in both images.

    I agree that this adjustment should be consistent from shot to shot. This
    would probably be achieved by deciding at the outset where you would like
    the adjustment to be for most subjects in this shoot, then keeping it there.

    Another mystery is the interoccular distance, the separation of the lenses.
    I have learned that this is not always the same as the human eyes, but
    depends on how far away you want to be able to distinguish stereo depth. For
    example, if the interocular is too close together, objects beyond about 30
    or 40 feet will all be in the same flat plane and have no depth. That would
    be true for real life as well, but it just seems too flat in a picture!

    So OK, don't shoot the Grand Canyon in 3D, you won't see any depth to it.
    You could inject some of your own design by making sure to have some
    foreground objects in the frame as well.

    Anyway, 3D is fun, and I can shoot in 3D and produce in HD or SD flat
    versions from the same footage, so all it costs is some extra data. This
    little Sony TD-10 is one fantastic little camera!

    Gary Eickmeier
     
    Gary Eickmeier, Apr 17, 2013
    #3
  4. Gary Eickmeier

    Brian Guest

    Some of the video converters have a 3D effect and he 3D depth can be
    adjusted. One example is Aiseesoft total media converter.
    If you are getting good results then the 3D depth should not be of a
    concern to you.
    I think it may apply then the subject is close to the camera. The only way
    to find out is to experiment.

    You can get some information from these sites.

    http://www.camcorderinfo.com/content/sony-hdr-td10-3d-camcorder-review/3d-features

    http://www.cyuan.org/papers/sid2011-3d.pdf
     
    Brian, Apr 17, 2013
    #4
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