Figure 1 q 2 4 3 0 3 2 1 1 1 1 2 2 0 1 1 3 p
TL9172 Digital image processing (3 ECTS) Examination 1
21.10.2005
Oulu Polytechnic, Institute of Technology Medical Engineering Degree Programme
1. Give an example how digital image processing can be utilized in the following ranges of electromagnetic (EM) spectrum (1 point each):
a. Gamma rays b. X-rays c. Ultraviolet d. Infrared
2. Give a brief answer to the following questions (1 point each).
a. Draw the grey level transformation that can be used to obtain image negative
b. What is the most common use for log-transform ? c. Explain the basic mechanism for gamma-correction.
d. Explain what contrast stretching means.
e. Explain what bit-plane slicing means.
3. Determine the length of the shortest a. 4-path
b. 8-path c. M-path
Between p and q (in Figure 1) when V={0,1} and V={0,1,2}. (6 p)
4. Do the histogram equalization to the image matrix shown below. Present both the gray level transformation and the new pixel values (5 p).
4 1 2 2 6
4 2 5 3 6
4 3 5 3 4
5 3 6 3 5
5 1 5 4 5
The maximum number of examination points is 20. The total number of points in this course will be 40. You need at least 14 points altogether to pass this
course.
