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Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
SIXTH SEMESTER B.TECH DEGREE EXAMINATION, APRIL 2018

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 a) State and explain the 2D sampling theorem. Explain how aliasing errors can be (7)
eliminated?

b) Define the terms brightness, contrast, hue and saturation with respect to a digital (4)

image.
c) Explain the terms False contouring and Mach band effect. (4)
2 a) Perform KL transform on the following matrix. (8)
_ [4 -2
x" இ 3 ۱
b) State and prove the convolution property of 2D DFT. (7)
3 a) Compute the 2D DFT of matrix x = ۶ ; (7)
b) Find the DCT of the sequence x(n) = {11,22,33,44}. (4)
c) Explain the energy compaction property of DCT. (4)

PART B
Answer any two full questions, each carries 15 marks.

4 a) What is meant by histogram equalization of an image? Explain how histogram (7)
equalization can be performed on a given gray scale image, with necessary
mathematical details.

b) Distinguish between image enhancement and image restoration. Give an example (4)
for each.
c) What are the steps involved in homomorphic filtering? (4)

5 a) Distinguish between smoothing and sharpening filters. Give the appropriate (8)

masks for any one smoothing and sharpening filters.

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