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Visual motion illusions

Posted 3 years ago
POSTED BY: Erik Mahieu
5 Replies
Posted 3 years ago

Sorry, Hendrik, I was not aware of your contribution. When I started with mine, I analysed the attached video (marioReversePhi.mp4) that inspired me. I also noticed the flashing colours and even tested alternative sequences other than te one used:

colors = 
  VideoMapList[
   Last@DominantColors[#Image, 2, {"Color", "Coverage"}] &, v];
repeatedColors = 
 RotateLeft[
  FindRepeat[colors[[All, 1]], 
   SameTest -> (Abs[#1[[1]] - #2[[1]]] < .05 &)], 0]

enter image description here

But I realised that neither the flashing nor the composition of the sequence was the main driver of this illusion. I converted the Mario video to grayscale and the illusion of motion was similar:

VideoFrameMap[ColorConvert[#, "Grayscale"] &, v]

enter image description here

I think that the flashing and coloring may help but the main contribution to the illusion is the edge effect which I tried to explain above. I am working further on this while trying to answer Sander Huisman about his previous suggestion. I will be back on this very interesting visual effect!

Attachments:
POSTED BY: Erik Mahieu

This is somewhat related to this old post - but better explained! Thanks for sharing!

POSTED BY: Henrik Schachner

Fantastic! Thanks for sharing! Perhaps this could be implemented in some Wolfram function repository function? Have you thought about this?

POSTED BY: Sander Huisman

It's an interesting spacial illusion, and I can see how this sort of thing can be used to prevent accidents such as bumping into things, with a lot of application.

POSTED BY: Naomi Elliott

enter image description here -- you have earned Featured Contributor Badge enter image description here Your exceptional post has been selected for our editorial column Staff Picks http://wolfr.am/StaffPicks and Your Profile is now distinguished by a Featured Contributor Badge and is displayed on the Featured Contributor Board. Thank you!

POSTED BY: EDITORIAL BOARD
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