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Jonathan Gin Joseph Leong Psych 221 March 11, 2003. Motivation: WHAT is that???. Advances of Stereography. 1832. 1979. 1959. 1832 – Wheatstone creates the first stereoscopic viewer 1959 – Julesz creates the random dot stereogram

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Jonathan Gin Joseph Leong Psych 221 March 11, 2003

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Jonathan gin joseph leong psych 221 march 11 2003

Jonathan Gin

Joseph Leong

Psych 221

March 11, 2003


Jonathan gin joseph leong psych 221 march 11 2003

Motivation:WHAT is that???


Jonathan gin joseph leong psych 221 march 11 2003

Advances of Stereography

1832

1979

1959

  • 1832 – Wheatstone creates the first stereoscopic viewer

  • 1959 – Julesz creates the random dot stereogram

  • 1979 – Tyler designs the first single image random dot stereogram


Jonathan gin joseph leong psych 221 march 11 2003

What is Stereography?

  • The word stereo originates from the Greek meaning spatial (3D)

  • Our eyes view the world from different perspectives allowing the creation of

  • 3-D images in 2-D planes


Jonathan gin joseph leong psych 221 march 11 2003

Importance of Stereography

  • Entertainment (VR, 3-D displays)

  • Medical Imaging

  • Terrain Mapping


Jonathan gin joseph leong psych 221 march 11 2003

Step 1


Jonathan gin joseph leong psych 221 march 11 2003

Step 2


Jonathan gin joseph leong psych 221 march 11 2003

AutoStereograms

  • Throw out those viewing glasses!

  • Autostereograms can be categorized as Random Dot Stereograms or Bitmap Patterned Stereograms:

Autostereograms


Jonathan gin joseph leong psych 221 march 11 2003

Algorithm to Making Random Dot Stereogram

  • Start with a depth map.

  • Taking each horizontal line at a time, impose the constraints of the pixels.

  • Scan the horizontal line, this time filling in the unassigned pixel values with random numbers.

  • Do this for all horizontal lines.


Jonathan gin joseph leong psych 221 march 11 2003

Depth Map

  • You can load in a depth map……….

  • Or Create your own!


Jonathan gin joseph leong psych 221 march 11 2003

Some Interesting Considerations…

Removal of Obscured Points


Jonathan gin joseph leong psych 221 march 11 2003

A distortion called “Echoes”….

  • Accidental occurance that two sets of points share a common point

=

Overlapped Dots


Jonathan gin joseph leong psych 221 march 11 2003

An Accurate Separation Distance Formula


Jonathan gin joseph leong psych 221 march 11 2003

Bitmap Pattern Stereography

  • easier to see than random dot stereograms

  • implementation very similar to random dot case


Jonathan gin joseph leong psych 221 march 11 2003

How to View Stereograms?

  • Stare through the picture, and concentrate

  •  These didn’t work for us…..

2. Look at your own reflections and stare!!!


Jonathan gin joseph leong psych 221 march 11 2003

TA DA!!!

Random Dot

Bitmap Pattern


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