CAD Presentation

By: Deep Patel (14MMCC15)

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Stereopsis – “Solid Sight”

Two Eyes

Interocular Distance (~2.5”)

Two Views

Limited Range (8”-30’)

Stereo Blindness

~12% of general population

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Active Stereo

Passive Stereo Polarized Filtered

Color Filtered

Autostereo

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Components Field Sequential Signal

Alternating Left/Right Images

LCD Shutter Glasses

Advantages Full Color Single Projector/Monitor Standard Screen or Monitor

Disadvantages Low Frame Rate Flicker More Expensive and Heavier

Glasses Light Loss Due to Glasses

Projectoror

monitor

Field Sequential Signal

Sync Signal

LCD ShutterGlasses

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Components Dual-projectors Polarized filter Polarized glasses Silver Screen

Preserves Polarization

Advantages Full Color Cheaper/Lighter Glasses Reduced Flicker Cheaper Projectors

Disadvantages Projector Synchronization and

Alignment Need Silver Screen Light Loss Due to Filter and

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Components Color Filtered Stereo Pair Color Filtered Glasses

Complementary Colors Color Pairs

Red/Cyan – Most Common Blue/Green

Advantages Can Combine Stereo Pair into Single

Image/Signal Works for Prints, Images, and Video Cheap Glasses

Disadvantages Hard to Get Full Colors– Best with Grayscale

Monitoror

Projector

CombineLeft/RightImage

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3D Without Glasses

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By Light Barrier Mask

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The idea is to project dynamic image onto rotating surfaces to create volumetric image,

This can only show transparent objects,

Problem is dead viewing area,

Commercial systems are far away.

Prototype have been build using: Rotating LED matrices,

Rotating helical projection using laser,

Laser projection into fog,

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Background

3D images contain more information than 2D Stereoscopic: 2x (L+R)

Multiview: ~8-16x

True 3D: continous (~100x)

Total number of beams law, points/sec rate Determine the quality of any 3D solution

Direction selective light emission Common for all 3D systems having a screen

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Additional independent variant to X, Y : Φ Emission range: FOV

Number of independent beams in the range: Angular resolution Φ = FOV / n

Angular resolution determines FOD.

Vertical / horizontal parallax Reduce the number of beams by

omitting vertical parallax

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Optical modules Project light beams to the points of the

screen from various angles

Holographic screen Direction selective property with

angularly dependent diffusion characteristics

Emission angle geometry determined The screen performs the necessary

optical transformation, but makes no principal change in directions

No optical road-blocks like at parallax barrier, lenticular lenses

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Medical

Entertainment and gaming

Advertising

Graphics and design

Flight simulators and navigation

Geology and mapping

Military and defense

Real estate

Air-traffic control

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Integrate existing applications / display 3D models in real-time Interactive applications

Display pre-rendered3D models High quality images

Display real-life 3Dscenes Light field streaming

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