3D perception

Discussion in 'General 3D and Stereoscopic Discussion' started by alexi_drago, Sep 1, 2015.

  1. alexi_drago

    alexi_drago Active Member

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    I get the feeling that many people dismiss 3D due to either not recognising or perhaps not percieving what it is that they're seeing, a lot seem to think automatically that 3D just means things pop out the screen and don't understand that there is depth behind the screen too even when it's presented to them. I have spoken to one person who says he doesn't see the difference between a 2D image and a 3D image with depth, however, I don't completely trust what he says as he does have a tendency to jump on one bandwagon or another and is firmly in the camp against 3D and when he put on a pair of passive 3D glasses he instantly started complaining 'my eyes, my eyes!' before he'd even looked at a 3D source so the glasses would have had no more effect than putting on a pair of weak sunglasses.

    Anyway, back to the perception, I've noticed a couple of strange effects while working on and viewing stereoscopic images and it seems to be caused by how the brain is processing the information from the eyes.
    The first, I'm sure everyone will have noticed is (particularly when viewing a still image or scene) when you move your head sideways it seems like objects that are static in the background or foreground slide around sideways too, this seems to be because your brain is being fooled into thinking it's looking at a 3D scene and is expecting the view to change as you move your head so to make sense of the view not changing the brain perceives it as the background or foreground objects must be moving.
    The second thing I've noticed is from doing some stereo graphics programming, I had a cube spinning around in the foreground that I could position somewhere out in front (pop out) of the screen. Even though the actual size of the drawing of the cube on the screen didn't vary, depending on where I positioned the cube out from the screen I was percieving it to change in size, the further out from the screen and closer to my eyes the stereo position got, the smaller I perceived it to be even though it's size on the screen never actually changed.

    Are there any other perceptual effects anyone else has noticed or anyone care to elaborate on those I've mentioned?
     
    Last edited: Sep 1, 2015
    alexi_drago, Sep 1, 2015
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  2. alexi_drago

    alexi_drago Active Member

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    Another thing I noticed once while a friends daughter was viewing 3D, she started flailing her arms around as if trying to repel something in front of her but there was nothing really popping out from the screen, it was as if she expected there to be things there just because it was 3D.
     
    alexi_drago, Sep 1, 2015
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  3. alexi_drago

    uuglypher Member

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    Hi, Alexi,
    I am in total agreement with your observations on the variety of responses shown by different individuals to a variety of presented 3D illusions. I have long concluded that ( other than the confirmed nay-Sayers that the only "true" 3D experience comes from "normal" binocular vision) there is as much individual variation in demonstrable acuity of depth perception with the un-aided pair of eyes as there is with the abilities of different individuals to perceive presented 3D illusions of other sorts.

    When the infant experiences its first visual experience as a consequence of being blasted with patches and shapes of tones of brightness and colors it experiences exactly what the rest of us ( other than the blind) experience every day of our lives. The only difference is that as the infant continues to experience vision, it learns (with varying degrees of success) to make sense of and extract meaning from those views of patches and shapes of tones of brightness and colors...just as we all have. As regards the concept of three dimensions, the results of the learning process can vary as much as can the results of any of the other learning processes we experience during life. Some individuals simply have a far greater capacity for greater accuracy of depth perception via binocular vision than do other people.

    And so, I have long ceased to be surprised at the wide differences in capacity for visual perception and discernment that can be observed in any large, randomly selected population that is studied.

    by way of example, some individual clearly perceive the 3D effect when viewing this image pair, some others will not.

    Dave image.png image.png
     
    uuglypher, Aug 15, 2016
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