Question 1
Which of the following describes how SIFT achieves rotation invariance?
Question 2
What is the primary benefit of using a multi-scale approach in SIFT keypoint detection?
Question 3
During SIFT descriptor construction, a $4 \times 4$ array of spatial bins is used. Within each bin, what type of information is accumulated?
Question 4
Which of the following is a key characteristic of SIFT descriptors that makes them robust for matching?
Question 5
What is the role of the 'keypoint localization' step in the SIFT algorithm?
