Class Notes:  Tuesday 10/1/02
 

    -    Check Class Assignment 3 on student pages (from Class Home Page)

    -    Check new material on student pages (from Class Home Page)
 
 

Interesting visualization device:    Random dot stereogram
 

Background:    How to represent 3-d ideas using the 2-d medium of paper?

    -    Perspective plots

    -    Movies:    "time" as 3rd dimension

    -    Polarized light 3d movies

    -   Red - Green colored views

    -    Random dot stereogram
 
 

Random Dot Stereogram:

Due to Bela Julesz

Discussed in Section 2.6 of text.

Example:

Idea:     "adjust your eyes" so that the two images are "on top of each other"

    a.    by focussing on a distant point

    b.    by crossing your eyes

Then staring at the image will eventually show:

    (a)    an "inset diamond"

    (b)    a "diamond floating out in front"
 

Try with both this image, and that on page 42 of the text
 

How does it work?

    -    "Tricks" the visual perceptual system

    -    Based on random pattern of dots

    -    Nearly the same for both eyes

    -    But the diamond shape is "shifted by one pixel"

    -    Eye keys on this to create impression of "depth"

    -    Detailed analysis of "time to seeing it" given in Text, Section 2.6

    -    Many variations exist, based on other types of patterns
 

More powerful graphics, including

    -    Box Plots

    -    Smooth histograms

    -    Movies
 

Available from software called "Matlab"
 

Introduction on Computing Tips Page
 
 

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