# 3D Anaglyph stereoscopic rendering - PowerPoint PPT Presentation

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Joshua Smith and Garrick Solberg CSS 552 Topics in Rendering. 3D Anaglyph stereoscopic rendering. What is Stereoscopy?. Adds “depth” to a two dimensional image via stereopsis Two planar images are rendered, one for each eye

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3D Anaglyph stereoscopic rendering

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#### Presentation Transcript

Joshua Smith and Garrick Solberg

CSS 552 Topics in Rendering

## 3D Anaglyph stereoscopic rendering

### What is Stereoscopy?

• Adds “depth” to a two dimensional image via stereopsis

• Two planar images are rendered, one for each eye

• Through some method, such as color filters, the brain is tricked into believing it is seeing one image, resulting in the perception of depth

### Human Depth Vision

• Our eyes see two slightly different views into the world

• Ex: look at an object and close one eye, then switch

• The eyes shift and rotate these views onto a point of convergence. Objects closer or farther away than this point creates parallax.

### Anaglyph Projection

• Image corresponding to the right eye projection is displayed on one color (blue, green, or cyan)

• Image corresponding to the left eye is displayed in red

• Stereo glasses filter out the image an eye is not supposed to see by matching the color

PQ/LR = VQ/VR

VQ/VR = VM/RN

= (w – C)/w =

1 – C/w

p = D(1 – C/w)

### Measuring Negative Parallax

PQ/LR = QV/VR

= QV/(QR-QV)

= (QV/QR)/(1 – (QV/QR))

QV/QR = VM/RN

= (C-w)/C = 1 – w/C

PQ/LR = p/D =

(1-w/C)/(w/C)

= C/w -1

p = -D(1 – C/w)

### FrustrumCalculationDiagram

top = Dnear * tan(θFOVy/2)

bottom = -top

a = raspect * Ctan(θFOVy/2)

### Special Considerations

Eye (camera) separation

Convergence distance

Camera positions

High contrast

### Eye Separation

Human eyes are 6.5cm apart

Less will loose information

More will create greater spatial view but harder on eyes

Images from :

### Convergence

Scale of 1/30 between observer and closes object.

Based off of the space between eyes

Equivalent to ≈ 2 meters from a window

Viewing area is both the window and the horizon.

### Convergence – Hyper-Stereo

Closer than 1/30th

Makes the image seem like a model

Image from:

http://www.flickriver.com/photos/ur4chun8/3529791785/

### Convergence Hypo-Stereo

Farther than 1/30th

Enlarges the image

Image from

### High Contrast

• Creates "ghosts" where anaglyphs are too close/strong red and cyan spots

• Areas with lots of red or green/blue areas will have little to no information for the corresponding eye

### Types of Images

• Time sequential

• Shutters close to match to left and right images on screen

• Polarized

• Each lens will block light polarized in the opposite direction with two images superimposed

• Anaglyph

• Glasses with two different colored lenses that corresponds to two images superimposed

### Types of Anaglyphs

Type

Colors Visible

• Red – Green

• Red – Blue

• Red – Cyan

• Magenta – Cyan

• Anachrome

• Mirachrome

• Trioscopic

• Inficolor

• ColorCode 3D

• Monochrome

• Monochrome

• Bad reds good greens

• Better than Red – Cyan

• Better colors

• Fuller colors

• Almost full color

Cutesy of Wikipedia

### Limitations with Anaglyphs

• Image quality

• High contract colors

• Limited on what colors are displayed by lens type