Illustration of the Capability and Limits of Visual Perception Aude Oliva Brain and Cognitive Sciences MIT Email: oliva@mit.edu Web site: cvcl.mit.edu
Demo 1 What do you see at a glance? Fast visual perception & Temporal constraints on visual processing
Temporal image understanding: Measuring Temporal image understanding: Measuring perceptual thresholds of various tasks perceptual thresholds of various tasks 80 msec mask duration Compare psychophysic al thresholds for a variety of Varying image tasks duration Incorrect: SOA n+1 Correct: SOA n+1 = SOAn + 10msec = SOAn – 30msec Greene & Oliva (2005)
Temporal image understanding: Measuring perceptual thresholds of various tasks 135 msec ~ 21 msec ~ 24 msec Threshold (in msec) for 75 % correct object in cluttered scene Global Scene Properties Greene & Oliva (2005, in preparation)
Demo 2 What do see when you are looking around? Visual search & Attention
How much did you miss…
Look for a person in the next scene
Where will the eye be drawn? Distractor INSIDE Distractor OUTSIDE Saliency * Context Context region Context region % trials on which eyes drawn to the distractor chance First fixation drawn to the Salient object WITHIN the Contextual region Kenner, Hidalgo-Sotelo, Oliva (2005)
Contextual Guidance Model Torralba, Oliva et al (2006)
Demo 3 Principles of visual perception and perceptual grouping
Hybrid Images Hybrid Images Angry man Neutral woman Web site: http://cvcl.mit.edu/hybridimage.htm
Hybrid Images What you see… From Far Away Up Close I see an angry guy It’s a woman!
Schyns & Oliva (1997)
Hybrid Images Hybrid Images Oliva, Torralba, Schyns (2006)
Perceptual Grouping Perceptual Grouping Reorganization of the shadows as a motorcycle Oliva, Torralba, Schyns (2006)
Changing expression Changing expression Sad Surprised Oliva, Torralba, Schyns (2006)
Perceptual & Cognitive Hysteresis Group 1: Walk towards the face Group 2: Walk away from the face Brady & Oliva (in preparation)
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