Proyectos de Investigación

Other & Demos

Definitions of Relative and Absolute disparities.


IS-P: I just made these images to explain the definitions of absolute and relative disparities.




IS-P: Calculus of binocular disparity of a 3D dot using the anaglyph technique.


Missing fundamental motion illusion

 IS-P: I made these examples in order to show this interesting motion illusion



 Squarewave signal moving rightward. 

Missing fundamental. Squarewave signal moving rightward

without the fundamental or first harmonic.

Do you see it moving rightward?



Analysis of the stimuli



Example of the missing fundamental illusion. Top left panel, spatio-temporal plot (x-t plot) of a squarewave stimuli (0.5 c/deg) moving rightward. Top right panel, x-t plot of the squarewave with the first harmonic removed (i.e. missing fundamental). Note that the edges are moving rightward but the stimulus is perceived moving leftward. Bottom panels show the spatio-temporal amplitude spectrum of the top x-t plots. Bottom-left panel, the energy of the first harmonic is located in the quadrants 1 & 3 (moving rightward). Bottom-right panel, spatio-temporal spectrum of the missing fundamental. Note that although the edges in the x-t plot are moving rightward, however, the energy of the current first harmonic (1.5 c/deg) is located in the quadrants 2 & 4 (moving leftward). By Ignacio Serrano-Pedraza.