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F192098 Pages:2

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

SIXTH SEMESTER B.TECH DEGREE EXAMINATION(S), DECEMBER 2019

Course Code: EC370
Course Name:Digital Image Processing

PART A
Answer any two full questions, each carries 15 marks

೩) Animage f(x, 9) = 2 cos 27 (3x + 4y) is sampled with sampling intervals Ax =
0.2 and Ay=0.2 inx and y direction respectively. Determine the
i) Sampled image spectrum
ii) Fourier transform of image after it has been low pass filtered
iii) Reconstructed image.

iv) Will the system produce aliasing error?

For the image segment 15 1 compute the transform coefficients using
i) DFT
ii) Haar transform
State and explain 2D sampling theorem for band limited images.
What are orthogonal transforms? Define the energy compaction property of an
unitary transform.
State and prove any two properties of 2D DFT.

Explain how colour images are represented using HSI colour space model.

PART B
Answer any two full questions, each carries 15 marks
Give a short note on geometric transformations.
Write the algorithm for computing median of an n x n neighbourhood.
What is the value of middle pixel after applying a i) 3 x 3 median filter and ii) 3 x
3 box filter ?

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| 4 |
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Derive the transfer function of Wiener filter. Give the condition in which Wiener
filter reduces to an inverse filter.

Distinguish between unsharp masking and high boost filtering.

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Duration: 3 Hours

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