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Understanding Optical Illusions Mohit Gupta
Truth: But this is an ! What are optical illusions? Light (Sensing) Oracle Perception: I see
Optical Illusion in Nature Image Courtesy:
A Brightness Illusion
Different kinds of illusions Brightness and Contrast Illusions Twisted Cord Illusions Color Illusions Perspective Illusions Relative Motion Illusions Illusions of Expressions
Lightness Constancy Our Vision System tries to compensate for differences in illumination
Why study optical illusions? Studying how brain is fooled teaches us how it works It makes us happy : Al Seckel Illusions of the senses tell us the truth about perception [Purkinje]
Simultaneous Contrast Illusions
Low-level Vision Explanation Receptive Fields in the Retina Negative Photo-receptors Positive Photo-receptors Inhibitory Light Excitatory Light
Low-level Vision Explanation Positive Gradient Negative Gradient
High-level Vision Explanation: Context Less Incident Illumination More Incident Illumination Brightness = Reflectance * Incident Illumination Higher Perceived Reflectance Lower Perceived Reflectance
The Hermann grid illusion
The Hermann grid: Low level Explanation Lateral Inhibition
The Hermann grid illusion Focus on one intersection
Why does the illusion disappear? Receptive fields are smaller near the fovea (center) of the eye
The Waved Grid: No illusion!
Scintillating Grids: Straight and Curved
Adelsons checkerboard illusion
Where is the illusion?
Rubiks Cube Color Illusion Same Color?
Rubiks Cube Color Illusion
Todorovics Gradient Chessboard Illusion Are all the dots the same color?
Craik-OBrien-Cornsweet Illusion Actual Profile Perceived Profile
Footstep Illusion Click Contrast affecting Perception of speed
Twisted Cord Illusions
Are the lines parallel? Straight?
Café Wall Illusion
A variant of the Café Wall Illusion
The Fraser Spiral Illusion
Pinnas Intertwining Illusion
Illusions involving perspective
Shepards table-top illusion Which is bigger?
Shepards table-top illusion Which is bigger?
Shape-from-Shading Shadows influence the perception of shape
Click Kerstens Ball and Shadow Illusion Shadows influence the perception of motion and position
Relative Motion Illusions
Out of Focus Illusion
Spinning Wheel Illusion
Motion Induced Blindness Click
Anamorphoses Leonardos Eye [Leonardo Da Vinci, 1485]
Image Courtsey: Good things come to those who wait
Why study optical illusions? Studying how brain is fooled teaches us how it works It makes us happy : Al Seckel Click Illusions of the senses tell us the truth about perception [Purkinje]
Have fun with Optical Illusions Then think about them! Eschers Waterfall
Mach Band Illusions
Intrinsic Image Separation
Footstep Illusion: Contrast affecting Perception of speed Kick-back Illusion Stepping feet Illusion Reverse-phi phenomenon[Howe et al, Journal of Vision]
Levels of Processing Low-level Vision Mid-level Vision High-level Vision Light receptive cells at the retina level Surfaces, contours, grouping Cognition – knowledge about materials, objects, scenes, illumination
SENSATION & PERCEPTION CHAPTERS 4 & 5 AP PSYCHOLOGY.
Starter What do you understand by the word Psychology? Write a short and simple definition in your book. The dictionary definition of Psychology is: Psychology.
Perception Chapter 6. Perception Selective Attention Perceptual Illusions Perceptual Organization Form Perception Motion Perception Perceptual Constancy.
Lecture 8 Human Input-Output Channels - Part II Human-Computer Interaction.
Cognitive Psychology, Fifth Edition, Robert J. Sternberg Chapter 3 Chapter 3: Visual Perception.
Lecture 7 Human Input-Output Channels – Part I Human-Computer Interaction.
Unit 4(G): Perceptual Organization and Interpretation Mr. McCormick A.P. Psychology.
Optical Illusions v1.0 Directions Its pretty straight forward… :-P However, just a tip… some of the examples have a lot of white space around them. I recommend.
Copyright © Allyn and Bacon 2007 Chapter 4 Sensation & Perception This multimedia product and its contents are protected under copyright law. The following.
“Op” Art Using Contrasts. “Op” is short for optical. Optical means having to do with the eye. An optometrist is an eye doctor.
1 PSYCHOLOGY (8th Edition) David Myers PowerPoint Slides Aneeq Ahmad Henderson State University Worth Publishers, © 2006.
Light. Where does light come from? Our major light source: the Sun.
© Andries van Dam et. al. CS123 INTRODUCTION TO COMPUTER GRAPHICS Introduction to Color CS123 – Introduction to Computer Graphics Color1/57.
Vision after complete blindness: Mike May Fine et al., Nature Neuroscience 2003; Robert Kurzon, ‘Crashing Through’
Lands Retinex algorithm 9.35 Edward Adelson. Lands Retinex theory of lightness constancy Edwin Land founded Polaroid. Cameras need correct exposure (both.
Pg 54 of IAN. Objective: To identify how parts of the eye function.
PowerPoint created by Mrs. B-D 2007 The Eyes Have It!
ConcepTest 23.1Reflection When watching the Moon over the ocean, you often see a long streak of light on the surface of the water. This occurs because:
Refraction Refraction of Water Waves Light Rays in Glass Atmospheric Refraction Apparent Depth Refraction is responsible for why objects look bent in water.
Sensation and Perception. Sensation How we detect physical energy from the environment and encode it into neural signals that the brain interprets as.
Thin Film Interference AP Physics B Montwood High School R. Casao.
Mise-en-scene from French mettre – “to place, put” refers to the visual arrangement of items on screen BUT, mise-en-scene also takes into account how those.
© 2010 Pearson Education, Inc. Conceptual Physics 11 th Edition Chapter 26: PROPERTIES OF LIGHT.
Sensation & Perception. Frasers spiral 1908 Sensation Definition What occurs when a stimulus activates a receptor What occurs when a stimulus activates.
Chapter 4 Sensation and Perception. Table of Contents Sensation and Perception: The Distinction Sensation : stimulation of sense organs Perception: selection,
Table of Contents OBJECTIVES: EXPLAIN THE DIFFERENCE BETWEEN SENSATION AND PERCEPTION COMPARE AND CONTRAST THE JND AND WEBERS LAW; AND THE ABSOLUTE THRESHOLD.
5 th Edition Copyright © Prentice Hall Psychology Stephen F. Davis Emporia State University Joseph J. Palladino University of Southern Indiana.
March 17, 2014 What is Op Art? Standard: EQ: What is Optical Art?
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