Lecture 19 – Recognition 2. Identity Age Attractiveness Grammar Emotions Humanface Gender.

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Presentation transcript:

Lecture 19 – Recognition 2

Identity Age Attractiveness Grammar Emotions Humanface Gender

Face Recognition Difficulties Identify similar faces (inter-class similarity) Accommodate intra-class variability due to: head pose illumination conditions expressions facial accessories aging effects Cartoon faces

Inter-class Similarity Different persons may have very similar appearance TwinsFather and son s

Intra-class Variability Faces with intra-subject variations in pose, illumination, expression, accessories, color, occlusions, and brightness

Wholistic Processing

Guillaume-Benjamin-Amand Duchenne 1806—1875 Charles Darwin 1809—1882 Paul Ekman 1934 Facial Expressions of Emotion

Happily surprised Angrily surprised Happy Surprised Angry

American Gothic, Grant Wood, 1930

American Gothic Illusion Neth & Martinez, Vision Research, 2010

Configural Features Martinez & Du, JMLR 2012; Martinez, CVPR 2011 anger sadness surprise disgust

Scene Recognition

Change Blindness shows that your conscious perception of a fully complete scene at each moment in time is really a mental construction. You only have detailed information about the small region around where your eyes are fixated.

Automatic Processing of Scenes

Scene context matters!

We can very quickly understand scenes…

which are old? which are new?

Picture Memory We can identify scenes in about 125 ms!! (Potter 1969) People can remember up to 2500 and even pictures at a rate of one image every 2 seconds. But can we? what kind of detail do we process/remember?

Potter et al. 1976

differences between pictures?

Relational Violations Five Relational Violations that can slow down object or scene processing according to Biederman et al. (1982): Support: Object does not appear to be resting on a surface Interposition: The background appears to pass through the object Probability: The object is unlikely to appear in the scene. Position: The object is likely to occur in that scene but is unlikely to be in that particular position. Size: The object appears too large or too small relative to other objects in the scene.

Biederman et al., 1981 Position violation

Interposition violation

Support, size, and probability violation