1. Visual Categorization with Bag of Keypoints
Gabriella Csurka
Christopher R. Dance
Lixin Fan
Jutta Willamowski
Cedric Brays
Presented by Jason Yosinski, Yun-hsueh Liu

2. SIFT Descriptors

3. Cluster SIFT Descriptors
Clusters k=200
Clusters k=20

4. Keypoints Histogram

5. Classifiers
Testing
Training

6. Classifier – Naïve Bayes
Classifying 39 test images using Bayes classifier (0.6 seconds).
confusion matrix
Correctness ratio: 54%

7. Classifier – Nearest Neighbor
Training nearest classifier (0.0 seconds).
Classifying 39 test images using nearest classifier (0.1 seconds).
confusion matrix
Correctness ratio: 59%

8. Classifier -- FLD Still working on this part…..
Have problem in doing ROC curves; we can’t get it working