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APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Sixth semester B.Tech degree examinations (S), September 2020

Course Code: EC370
Course Name: Digital Image Processing

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks Marks
1 ஐ Explain the term ‘“‘m-connectivity” with respect to a digital image. (2)
b) Obtain the correlation of the following two matrices using matrix method. (5)
_ [11 2 _ (3 4
x(m,n) = ۳ ച്ച h(m,n) = ۲ 4
c) Compare 2D DFT and DCT of the gray scale image, (8)
1 2 3 4
_|5 6 7 8
(१५ = 2 3 4
5 6 7 8

2 a) Explain the principle of sampling and quantization. Discuss its effect on (8)

increasing (i) sampling frequency and (ii) quantization levels of image.

b) With diagram, explain the different colour image models. (7)

3 2) Obtain KL transform basis for the following matrix (8)
൨2
x=[3 4

b) State and prove convolution property and periodicity property of 2D DFT. (7)
PART B

Answer any two full questions, each carries 15 marks
4 a) Derive a Wiener filter for image restoration using minimum mean square (10)
approach. Give the condition in which Wiener filter reduces to an inverse filter.

b) Perform histogram equalization of an image shown below: (5)
3 2 4 5

_7 7 8 2
ரந: |3 1 2 3
5 4 6 7

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