Introduction to SIFT features

1
Introduction to SIFT features

• Original idea
• David G. Lowe

2
Outdoor environment
3
API platform
4
API platform
5
Scale-Space
6
Gausian Kernel, DOG
Sigma 4
Diff Sigma2-Sigma4
Sigma 2
7
Difference of Gausian, DOG
8
DOG
9
SIFT keypoints
10
After extrema detection
11
After curvature, edge responses
12
Keypoints orientation and scale
13
Keypoint orientation and scale
14
(No Transcript)
15
Orientation histogram
16
PCA-SIFT
Reduction of the feature vector from 128 to 36
descriptors
17
Rotation
18
Outdoor experiment
19
Interest point detection
20
Stereo matches
21
Transient matches
22
Problems
23
(No Transcript)
24
(No Transcript)
25
(No Transcript)