APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
SECOND SEMESTER M.TECH DEGREE EXAMINATION, MAY 2016

Electronics &Communication Engineering

Signal Processing
OIEC6304 Digital Inuge Pmcessing
Max. Marks : 60 Duration: 3 Hours

PART A (Amswer any two questions)

1.. Determine the DFT rrutrix for N—4. (5 Marks)
0. Explain the principle of homornorphic filter. (4 Marks) 2. a. DCT has excellent लाला
compaction for hi$)ly correlated data .Why? (5 Marks)

b. Compare histogram equalization and histogram rnatching. (4 Marks)

3. a. Prove that two dimelbional circular convolution oftwo arrays is the product (5 Marks) of
their DFTs.
b. Explain the mechanism of unsharp masking. (4 Marks) PART B (Amswer any two
questions)

4 8. Derive an expression for the transfer hinction of2D Wiener filter. (5 Marks) 0. Explain Huff-
nan coding. (4 Marks)
5 ௨ The different combination of3x3 irnages are given below (5 Marks)
0 1 1
(i) | 2 1
1 102
(11) 1 2 1 (111) 1 20

In which case the entropy is minimum? Justify your answer?

b. Explain LOG filter . (4 Marks)
6 a€Explain diagonalisation of block circulant nutTices. (5 Marks)
b. Explain any two types of objective Fidelity criteria. (4 marks)

PART C (Answer any two questions)
7 8 Explain morphological operations required for generating the skeleton of an (6 Marks) image.
b. Discuss Fourier slice theorem.(6 Marks)
8 9. What are structuring elements? (6 Marks) b. Explain Algebraic Reconstruction
Technique. (6 Marks)

9 8. Describe the irnage reconstruction technique using parallel beam filtered (6 Marks) back
projection.

0. Explain hit-and-miss transform. (6 Marks)