0:10:08: Q1 What does orthogonal mean for a matrix Q? ANS: b
0:17:23: Q2. D is diagonal and therefore it corresponds to scalingrotationtranslation? ANS: scaling
0:25:00: Q3. What is the corresponding cartesian coordinate of a 2D point (4,6,2) in homogeneous coordinate? ANS: (2,3)
0:50:11: Q4. How many degree of freedom do we have for 2D rotation? ANS: 1
0:51:15: Q5. how about rigid transformation? ANS: 3
0:53:33: Q6 how about similarity transformation ANS: 4
0:54:53: Q7 How about affine transformation? ANS: 6
0:55:26: Q8 How about homography (projective transform)? ANS: 8