Rapid Object Detection using a Boosted Cascade of Simple Features

1. Rapid Object Detection using a Boosted Cascade of Simple Features Author：Paul Viola, Michael Jones Conference on Computer Vision and Pattern Recognition 2001 Speaker：Liu, Yi-Hsien

2. Outline • Introduction • Features • Integral Image • AdaBoost • Cascade • Conclusions

3. Introduction There are three main contribution of this paper: • Integral image • Contract classifiers by AdaBoost • Combine classifiers in a cascade structure • Viola–Jones object detection framework

4. Features • Harr-like Feature

5. Integral Image

6. Integral Image(Cont.) • 1=A • 2=A+B • 3=A+C • 4=A+B+C+D • A=1 • B=2-1 • C=3-1 • D=4-2-3+1

7. AdaBoost • Select a small set of features • Train the classifier

8. AdaBoost(Cont.)

9. AdaBoost(Cont.)

10. AdaBoost(Cont.)

11. Cascade

12. Conclusions