计算机视觉代写 | Robot Vision Main Summer Examinations

本次英国代写主要为计算机视觉相关的限时测试

Question 1
(a) Multiple Choice Each question has ONLY ONE CORRECT OPTION and is worth
3 marks. [6 marks]
(i) Which one does not aect the intrinsic parameters of a camera model?
a) Principal point coordinates
b) Image resolution
c) Focal length
d) Radial distortion
e) Exposure
(ii) In which case do you have to recalibrate the camera intrinsic parameters?
a) When the background scene changes
b) When the camera is rotated to 90 degrees
c) When there are quick illumination changes
d) When changing the image resolution
e) When you are moving around with the camera
(b) Give two reasons for using lenses in cameras. [6 marks]
(c) There is a mobile robot with two cameras (both are assumed as a pinhole model
and baseline between the cameras is 15 cm) whose optical axes lie on a horizontal
plane and parallel. In the initial position, the disparity of a point P in space is 30
mm, and the disparity is changed to 50 mm when the robot moves 40 cm toward
the point P. Calculate the focal length and show your working. [8 marks]

Question 2
(a) The Phong illumination (re ection) model is an empirical model of the local illumi-
nation of points on a surface. Name three components composing the Phong model
and describe each component. [6 marks]
(b) Draw results of following four operations i) dilation, ii) erosion, iii) opening, and iv)
closing on the given image (12  12 pixels) using the given mask. [6 marks]
(c) Describe the steps of the Canny edge detector. [8 marks]

Question 3
(a) Describe the steps of the RANSAC algorithm. [6 marks]
(b) Describe pros and cons of K-means clustering (at least two for each pros and cons).
[6 marks]
(c) Explain what makes SIFT descriptor invariant to i) scale, ii) rotation, iii) illumination,
and iv) small shifts (translations), separately. [8 marks]