Louisiana State University
Department of Electrical and Computer Engineering
EE4780 - Introduction to Computer Vision
Spring 2006

Problem Set 4

Assigned: March 24, 2006 (Friday)
Due: April 2, 2006 (Sunday)
What to Return: Email your m-file to the TA (zhao.ta@gmail.com) by midnight.

Problem: (100 points)

Write an m-file that finds the direction of a light source from an image of a perfect Lambertian sphere.
Assume that the light source is a point source at infinity.
Test your code with the images "Picture1.png" and "Picture2.png" given on the website.

NOTE: You may determine the center and the radius of the spheres manually.



BONUS: (20 points) Determine the center and the radius of the spheres automatically.