1. Mentor: Salman Khokhar
Action Recognition in Crowds
Week 3
Mentor: Salman Khokhar

2. Feature Extractions and Codebook
SVM Training
Input Video
Feature Extractions and Codebook
Histograms
Annotations
Scores
Software Used: LibSVM & Matlab

3. Color Codes Yellow = missed detection Green = false positive
Blue = correct detection
Red fill = confidence level
No fill = not the action

4. Action recognition (33 Frames)

5. Precision-recall and ROC curve (11 annotations)
46.2%
56.6%

6. Action recognition (33 Frames)

7. Precision-recall and ROC curve (30 annotations)
58.3%
31.2%

8. Action recognition (20 Frames)

9. Precision-recall and ROC curve (21 annotations)
30%
72%

10. Next Week… Continue SVM training
Improve current action recognition algorithm
Train across multiple videos instead of just one