The illusion of Depth What is Stereoscopy Derived from Greek word stereo meaning solid and scopy meaning viewed Early form of 3D image using lenses Anaglyph Stereo Image ID: 585079
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Slide1
Stereoscopy
The illusion of DepthSlide2
What is Stereoscopy?
Derived from Greek word “stereo” meaning “solid” and “
scopy
” meaning “viewed”
Early form of 3D image using lenses:Anaglyph Stereo Image Slide3
History
280 BC
–
Postulated by Euclid1833 –
first stereoscopy using mirrors.Slide4
Modern Stereoscopic methods: Passive
Passive Viewers:
Color Filtering
Standard is Red for right eye and Cyan for left eyeSlide5
Modern Stereoscopic methods: Active
Active Viewers:
Switching
Glasses switch eyes coordinated with screenSlide6
The eye and the brain conspire to fool you !!!
Stereoscopy: How it worksSlide7
Stereopsis: The Brain…
under 50 ft.
Brain uses feedback from the eye muscles to determine parallax:
Convergence.Slide8
Stereopsis: The Brain…
beyond 50 ft.
Brain uses feedback from the eye muscles to determine parallax
Convergence.
But, Also….Slide9
Stereopsis: The Brain…
beyond 50
ft
Brain senses differences between images on the retina.
Factors influencing Focus and Tracking.
Angular size of objects
Classical perspective
Desaturation of colors
Atmospheric Distortion
Shadows
Motion ParallaxSlide10
Stereopsis: Problems
Stereopsis
Convergence
Focus
Orthogonal distortionStereopsis – processes of convergence and focusConvergence
–
brain solves for parallax
Focus
–
eye and brain solve for sharpness
Stereoscopic illusions require Convergence and focus to
work separately
.Slide11
Stereopsis: Problems
Stereopsis
Convergence
Focus
Orthogonal distortionThe smaller something is, the more distorted the angles and shapes they form.Your brain resists interpreting large angles on a small display.Slide12
Modern Applications: Video
3D movies have been available since “The Power of Love” -1922
The increased cost of creation must be offset (costs more to see)
Few people have 3D display tech for aftermarket viewing
Digital videography is dropping the cost of 3D filming.Slide13
Applications: Virtual Reality
As a sub-function of smartphones making them much more prevalent.
Headsets
“Window on Reality” using camera with overlay images. (Pokémon game)Slide14
Credits
1- “
The Illusion of Reality in Stereoscopy
”, CC0, Donald E Seminek
3- Image: Women using Stereoscope, CC0, Hyperlink4- Image: Stereoscopy by Osiponkive, CC0, Hyperlink
5- image via Creative Commons, CC0,
–
Author
Locafox.de
7-
Astronomygcxe.co.uk
with author’s permission
12-
Pixabay
, CC0, no credits
13-
Pixabay
, CC0, Stefan
Schweihofer
, GermanySlide15
Widescreen Test Pattern (16:9)
Aspect Ratio Test
(Should appear circular)
16x9
4x3Slide16
Perspective
One-point Perspective
Two-point Perspective
ReturnSlide17
Angular Size and Motion
The Moon’s motion across the sky is about 15 degrees per hour.
Return