Grouping
- Goals
- Gather features that belong together
- obtain an intermediate representation that cmopactly describes key image or video parts
- Top down segmentation: pixels belong together because they are from the same object
- Bottom up segmentation: pixels belong together because they look similar
- Gestalt Theory
- Whole is greater than sum of its parts
- Relationships among parts can yield new properties/features
Segmentation
- K-means clustering
- Probabilistic clustering
- Mixture of Gaussians
- GMM
- Mean-shift Algorithm