Cognitive Systems

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Cognitive Systems
Foundations of Information Processingin Natural
and Artificial Systems Lecture 5 3D Visual
Perception
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3D Perception / Color Perception

• Depth Perception
• Perceptual Organization
• Visual Completion
• Object Recognition

5.0
3
5.1
4
Depth Perception
5.1.1
5
The Problem of Depth Perception
5.1.2
6
Marrs 2.5-D Sketch
5.1.3
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From the Primal Sketch to the 2.5-D Sketch
5.1.4
8
The Hallway Illusion
5.1.5
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Four Kinds of Edges in an Image
5.1.6
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Convex vs. Concave Orientation Edges
5.1.7
11
Physical Constraints (I)
5.1.8
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Physical Constraints (II)
5.1.9
13
Impossible Objects
5.1.10
14
Shading (I)
5.1.11
15
Shading (II)
5.1.12
16
Perceptual Organization
5.2
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Classical Principles of Grouping (I)
5.2.1
18
Classical Principles of Grouping (II)
5.2.2
19
Degrees of Grouping
0 Px
5.2.3
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Tradeoffs between Grouping
0 Px
5.2.4
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Grouping by Synchrony
5.2.5
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Grouping by Common Region
5.2.6
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Grouping by Element Connectedness
5.2.7
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Figure/Ground Organization
5.2.8
25
Visual Completion
5.3
26
Edge Relatability
5.3.1
27
Illusory Contours
5.3.2
28
Illusory Contours (II)
5.3.3
29
Size Constancy
5.3.4
30
Size Illusion
5.3.5
31
Object Recognition / Object Models

• Object recognition is based on knowledge about
• Object parts
• and their spatial relationships
• Typical views
• gt Different approaches focus on different types
  of knowledge used in object recognition

5.4
32
Line-Complement Priming Experiment
5.4.1
33
Biedermans Geon Theory
5.4.2
34
Geons
5.4.3
35
Nonaccidental Properties of two Geons
5.4.4
36
Marrs Hierarchy of 3-D Models
5.4.5
37
Next week

• Color Perception
• Auditory, tactile, olfactory, and taste
  perception
• Multimodal integration of perceptual information

5.5