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About hologram technology

  1. Jun 5, 2010 #1
    hello, It's chitose wonder chick again.

    First, I don't know where should I put this question so I choose this.

    ..................................................

    yesterday, I talk with my friend about hologram we saw in magazine and something bother me...

    Dose hologram have refect on objuct? such as clear floor

    I watch the news that claim about their useing hologram technology while interveiw (I belive you guys saw it too) and something not right...

    hologram1_wideweb__470x2770.jpg

    I don't see any changing of light in area around woman that claim to be holograph, nor any reflect on floor. (floor is clear enough to reflect table... see?)

    Since we can see it, dose it mean there are light emiting form it to our eyes right? so it should have reflect if these hologram thing are place on clear floor or anything that reflective.

    or it naturally for hologram to have no reflect or change in light of surrounding it?

    can anyone advice.

    ..................................................
    P.S. English is not my native languge, please fogive me If I'm wrong in gramma or spelling.
     
    Last edited: Jun 5, 2010
  2. jcsd
  3. Jun 5, 2010 #2
    Light from a hologram is just like light from any other source. Holograms do indeed appear in reflections.


    "Something not right" indeed. What they were doing was not even remotely similar to a hologram. It's just a standard chroma key effect...the person being "projected" stands in front of a colored screen, and the colored background is subtracted out when her image is composited into the main video. The only thing new was that they used a bunch of cameras so they could get it to look right from multiple angles. There was nothing actually being projected anywhere.

    Real holographic projectors have been built, but they are experimental pieces of lab equipment rather than useful displays. The displays are quite small, low resolution, monochromatic, and require very large amounts of processing power. Also, real holograms can't be projected out into thin air like that...you can see a 3D image, but only where there's a holographic screen behind it.

    http://www.technologyreview.com/computing/18572

    There's several other types of 3D displays out there, from screens with lenticular arrays to show a 3D image to someone sitting in the right position, to devices using spinning mirrors and projectors to produce a 3D effect.
     
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