APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

SECOND SEMESTER M.TECH DEGREE EXAMINATION, DECEMBER 2017
Electronics and Communication Engineering
(Signal Processing)

01EC6304- Digital Image Processing

Max.Marks: 60 Duration: 3 hours
Answer any two questions from each Section

SECTION-4.£2x9)

|. (a) State and explain 2-D Sampling Theorem for band limited images. (4) (b) The image
I(x, y) 4 cos4z x. cos 67y ட ideally sampled with Ax = 0.5 and the
1 1

> .
2Ax | What is the reconstructed
(5)

samples are passed through an ideal LPF with bandwidth |

Bf 7

2 52
= 7 24

Il. For the 2x2 transform A and the image (J, A= 2 2 | andU= + calculate the

transformed image V and the basis images. Also represent the original image in terms of basis images.

image?

(9)

Ill. (2) For the image segment | = , compute the transform coefficients using 1 3
1. DFT ii. Haar Transform (4)

(b) Explain Homomorphic Filtering.

(5)
SECTION-B

IV. (a) Define the following
i. Point Spread function (PSF) ii. Circulant matrices iii. Block Circulant matrices (3)

(b) Explain Image Segmentation using Region Growing. (6)
۷ Explain DCT based JPEG Image Compression standard. What are the advantages of JPEG-2000 standard over
JPEG? (9)

VI. (a) What are the basic steps in Canny Edge Detection Algorithm? (3)
(b) Derive an expression for the frequency response of 2-D Discrete Wiener filter used for Image
(6)
(P.T.O)

Restoration.

SECTIQ&C (202)

۷۱. (a) State and prove Fourier-Slice theorem. (4)
(b) Explain the following Morphological Algorithms
i. Hole Filling ii. Thickening iii. Pruning (8)