Physics behind 3D Movies - PowerPoint PPT Presentation

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Physics behind 3D Movies

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  1. Physics behind 3D Movies Ng Boon Hian

  2. Case Study – 3D movies With 3D viewing technology offered in cinemas, many people are fast to snap up on the tickets to 3D movies. I watched Alice in Wonderland in 3D version at Shaw Theatre recently and wondered what was the science behind the 3D glasses.

  3. How do our eyes work • Our eyes project a 3D image in the brain by seeing things from two different viewpoints as noted by the gap between our eyes and these 2 2D images are formed in the brain into 1 3D image. Thus, 3D images are formed and everything in the real world is 3D.

  4. 2D Movies 2D movies work on a film being projected onto the screen. Everything is on the screen and in 2D. The light is unpolarized.

  5. Polarized light and Unpolarized ight • Light is an electromagnetic wave • Electromagnetic waves consist of electric and magnetic component • Electric component (electric force field) moves up and down as the electromagnetic waves forward

  6. Unpolarized light • From Sun, bulbs, candles • No fixed plant of oscillation • Yellow plane arrow changes angles but keeps direction of light • Random changes in direction of light 3D animation

  7. Polarized Light • Filtered Light • Fixed plane of oscillation • Half of the intensity of unpolarized light

  8. Unpolarized VS Polarized • For unpolarized light, no matter how the arrow turns, electric forces are always perpendicular to ray direction Polarized light Unpolarized light

  9. Polarizers • Filters out the unpolarized light into single light planes • Have lines aligned in 1 direction and only allow 1 plane of light to pass • Circular polarization and linear polarization

  10. Circular polarizer and linear polarizer • Circular polarizer used for 3D glasses

  11. Circular polarizer and linear polarizer • Circular polarizer is just a quarter wave plate in addition to the linear polarizer • Linear polarized 3D glasses will work with all the old stereo projectors, StereoJet prints, and modern projector systems with linear polarizers attached • Circular polarized 3D glasses are specifically for the StereoGraphics Z-Screen and some 3-D digital projection systems.

  12. Circular polarizer and linear polarizer • Not much difference as both saturates colors and eliminates reflections from water and windows for cameras • Circular polarizers are more expensive but can eliminate possible metering errors while linear polarizers are unable to

  13. Filters to transform unpolarized light to polarized light • Polaroid filter • Enables only 1 polarization of light to pass through.

  14. 3D Movies • Eyes are two inches apart, two different angles on viewing the same things creates a 3D image • 3D movies trick the brain by projecting two 2D images separately to the two eyes and recreate a 3D image in the brain

  15. 3D Movies • 3D movies not viewed with the glasses are very fuzzy and eye-straining to look at • The same scene is projected simultaneously from two sources • Previous 3D movies used colour as filter but polarization is used

  16. Colour and Polarization • Colour 3D uses contrast of colours • An anaglyph image is formed • Each lens is made up of a chromatically different colour – blue and red • Colour used to provide separation • Red part allows blue light to enter while blue part allows red light to enter

  17. Colour as filter • A severe disadvantage is that film cannot have much colour as colour is used as filter in this case Stereo Monochrome image

  18. Polarization • Two synchronised projectors project two respective views, each with a different polarization • Each side of the glasses allows 1 plane of light to enter

  19. 3D Movies • Due to the 3D effect, viewers can feel the thrill of being in the movie themselves and get really close to the characters

  20. Bites • 3D glasses if not cleaned properly can pass on eye infections to others • Can cause headaches and blurred vision • Forces viewers to focus on things in the foreground (which causes eyes to converge) and distance (which causes them to separate) simultaneously • Vergence accomodation conflict

  21. Build your own 3D glasses activity • Cardboard • Scissors • Tape • Red and Blue acetate (Available from art store)

  22. Build your own 3D glasses activity • Trace a pattern on the paper of the three parts of spec mainly the two sides and a middle portion • Place them on the cardboard and cut out the shapes • Cut eyeholes • Tape the blue and red acetate separately on the two eyeholes and you have a 3D glasses

  23. Other Facts • 3D glasses used will not produce a 3D effect on home TV as light is unpolarized

  24. Thank you! • • • • • • • • • • • • •