1. Combining Local Descriptors for 3D Object Recognition and Categorization
Author :Andrea Selinger Salgian
Department of Computer Science
The College of New Jersey
date:2009/02/23
repoter：鄒嘉恆

2. Introduction
Combine keyed context patches and SIFT to significantly reduce the error rate on recognition and categorization.

3. Outline The descriptors Experimental results Conclusion
Keyed context patches
SIFT
Experimental results
Object recognition
Object categorization
Conclusion

4. Keyed context patches

5. SIFT(1/5)
Scale-space extrema detection

6. SIFT(2/5) Keypoint localization Elimination low contrast
Elimination edge response

7. SIFT(3/5)
Orientation assignment

8. SIFT(4/5)
Keypoint descriptor extraction

9. SIFT(5/5)

10. Experimental results(1/2)
Object recognition

11. Experimental results(2/2)
Object categorization

12. Conclusion
Confirm that the performance of the descriptor combination is higher than that of either of the descriptors alone.