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Lec. 27, Tuesday, Nov. 30Chapter 8: Binocular vision (cont’d.)

• Why two eyes• Binocular disparity• Conveying depth in art• Stereo images

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We are here

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Next homework is due Tuesday, Dec. 7.

Review: mpeg movies, examples

Clicker questions Thursday!

MPEG files (review)

MPEG (moving picture experts group) files are for movies and DVDs

The basic idea:1. Send a complete picture every now and then2. Between complete pictures, send only the

difference between the images (consider a car moving against a fixed background)

3. Send fewer colors than the whole range

Prof. Robertson

Classroom teachingPHYS1230 Light and Color – Fall 2010

PHYS5150 Plasma Physics – Spring 2011

Ionospheric physics with rocket instruments(Ionized upper atmosphere)

Scott KnappmillerShannon DicksonRobert Niederriter

Devin Konecny

AdvisingEngineering physics majors

Thesis committees

Research projects

Space physicsLunar surface environment

Addrienne DoveTodd Strong

HobbiesAdventure travel

movie

movies

http://plasma.colorado.edu/MASS_movie.MOV

http://www.misu.su.se/~jacek/nlcmovies.html

Visit to caribou migrationJune 2010, Brooks Range, Alaska

Demo: caribou crossing moviehttp://plasma.colorado.edu/Alaska/caribou_crossing.wmv

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Conveying 3-d in 2-d art

Six ambiguous depth cues (having more than one interpretation)

1.Size2.Perspective3.Light and shadow4.Low contrast5.Overlay6.Previous knowledge

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2. Perspective

The convergence of parallel lines as they become more distant, as in railroad tracks. Also, tall buildings look less wide at the top.

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“Vanishing point”

Masaccio

Trinity (1425-1428)

First use of perspective in western art.

Santa Maria Novella, Florence

Filippo Lippi

1406-1469

Annunciation

1445

9Pieter Jansz Saenredam, Assendelft Church, 1649.

10Pieter Jansz Saenredam, Assendelft Church, 1649.

11ARTIST Giorgio de ChiricoPAINTING Mystery and Melancholy of a Street“Mystery” is made by confusing perspective.

12Artist Name: John Grazier, Title: Will Grandmother Be Home

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"The Suitcase and the City" by John Grazier.

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Rays of light travel from the object, through the picture plane,and to the viewer's eye. This is the basis for graphical perspective

Wikipedia

Extended lines

Converge at two points

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Two point perspective Used when the picture plane is not parallel to surfaces in

the image.

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Giorgio de ChiricoNatura morta, Torino a primavera1914

Two vanishing points

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Giorgio de ChiricoNatura morta, Torino a primavera1914

Two vanishing points

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3. Light and shadow

The shadow shows the cross section of the object

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Wall clock. Alarm clock on table. Ball on table.

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Nativity at Night by Geertgen tot Sint Jans, c. 1490

The Matchmaker by Gerrit van Honthorst

What is the source of light?

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Shadows also convey texture

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Francisco de Zurbarán, Martyrdom of Saint Serapion, 1628.

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Yrjö Edelmann

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Artist Yrjö Edelmann

Title Lotta i sängen

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Highlights

• These are reflections of incident light.

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24Matisse: The Painter’s Family

No shadow. No perspective. On purpose.

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4. Low contrast for distance

Pine Trees, six sided screen, Hasegawa Tohaku, (1539-1610)

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26Hiroshige: Miyanokoshi

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5. Overlay

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Overlay as done by Rene Magritte

28Rene Magritte -Carte Blanche

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6. Previous knowledge

Which bunny is closer than the cow?

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6. Previous knowledge (2)

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Table top is not a parallelogram. Table top is not a trapezoid. Also demonstrates shape constancy.

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Schroeder’s stairs Thiery’s figure

Ambiguous figures

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M. C. Escher

Waterfall

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In which direction will it drive off?

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Victor

Vasarely

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Lec. 27, Tuesday, April 20Chapter 8: Binocular vision

• Why two eyes• Binocular disparity• Conveying depth in art• Stereo images

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We are here

35Demo:

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How do colored 3-d glasses work?

The two images are in red and blue ink, printed on the same page.

Red ink is black seen through the blue filter and is light seen through the red filter. The reverse is true for blue ink. So the red-filtered eye sees the blue image and vise versa.

Problem: images do not have a full range of color.

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Special screen that does not “scramble”polarization

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http://www.youtube.com/watch?v=2pkGVbz75fg

Dragon in 3D by 3D Phil – Use Red & Cyan 3D Glasses

http://www.youtube.com/watch?v=iLEL-IybU-s&feature=related

Animation of rotating objects:

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How do polarized 3-d glasses work?

1. The two images are projected onto a screen. 2. The light passes through polarizing filters leaning 45

degrees to the left and 45 degrees to the right.3. The person wears polarizing glasses so each eye sees

just one of the images. 4. The projection screen must be special to preserve the

polarization.

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Special screen that does not “scramble”polarization