Image Processing - May 2012

Information Technology (Semester 7)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks.

Attempt any four questions:-

1(a) Find the energy of the signal
(5 marks) 1(b) Prove that two dimensional DFT matrix is an unitary matrix.(5 marks) 1(c) What do you understand by digital negative of an image?(5 marks) 1(d) Show that Highpass = Original - Lowpass.(5 marks) 1(e) Give five classifications for the system in Digital Signal Processing with examples.(5 marks) 1(f) Compare analog and digital filters.(5 marks) 2(a) Find convolution of the two sequences x(n)= {1,2,3,4}h(n)={1,-1} (4 marks) 2(b) Determine N point circular convolution
(6 marks) 2(c) A particular digital image with 8 quantization level has following histogram. Perform the histogram equalization.
(10 marks) 3(a) What is morphology? Name and explain the basic operations in morphology.(10 marks) 3(b) For the 3-bit 4X4 image perform the following operation:-
(i) Negative
(ii) Thresholding with T=4
(iii) Intensity level slicing with background r₁=2 & r₂ =5
(iv) bit-plane slicing for MSB & LSB
(v) Clipping with r₁=2 & r₂ =5
(10 marks) 4(a) Design a Butterworth filter using Bilinear Transformation method with the following specification
A_p=3dB, A_s=15dB, ?_p=0.5?, ?_s=0.75?, F_s=1Hz.(10 marks) 4(b) Explain the method of segmentation using region splitting and merging.(10 marks) 5(a) Explain the following with examples:
(i) Thinning
(ii) Hit or miss transformation(10 marks) 5(b) Find 8 point DFT if x(n).
(10 marks) 6(a) Differentiate between the following:
(i) Convolution Vs Correlation.
(ii) Bit- plane slicing Vs Grey level slicing.
(iii) Low pass filter Vs Median filter.(10 marks) 6(b) Write a note on DCT and its applications . Find DCT of the given 4x4 image.
(10 marks)

Write short notes on (any four) :-

7(a) Digital Watermarking.(5 marks) 7(b) Biometrics Authentication.(5 marks) 7(c) Lossy Image Compression.(5 marks) 7(d) Content Based Image Retrieval (CBIR).(5 marks) 7(e) Text Compression.(5 marks) 7(f) Hadamard Transform.(5 marks) 7(g) Vector Quantization.(5 marks)