Need for Matching
viewgraphs.fm—4
Nevatia - 12
8/4^95
• For inference of 3-D from multiple views
• For registering a model to an image
• For Object Recognition
• Problems:
• To find the right features (descriptions) to match
• Low level features
• easier to extract but ambiguous, and not invariant
• Higher level features
• more reliable but difficult to compute
• Suggested by Gestalt Psychologists (~ 1920s)
Identified grouping properties such as
• continuation
• closure
• symmetry
but did not provide a computational definition.
• Requirements for Grouping
• Properties for Grouping
• Selection among competing properties
• Efficiency and generality of the process
viewgraphs.fm—3
8/4/95
Perceptual Grouping