Digital Signal and Image Processing (DSIP) Semester 7 (3 Hours) May 2012

Digital Signal and Image Processing (DSIP) Semester 7 (3 Hours) May 2012
GN-6302 [Total Marks : 100]
N.B:	(1)	Question no 1 is compulsory.
	(2)	Attempt any four question out of remaining six questions.
	(3)	Assume suitable data if necessary.
1.	Justify / contradict following statements.		20
	(a)	Laplacian is better than gradient for detection of edges.
	(b)	For digital image having salt and pepper noise, median filter is the best filter
	(c)	Unit Ramp signal is neither Energy nor power Signal.
	(d)	Lossy compression is not suitable for compression executables files.
2.	(a)	Perform Histogram Equalization for following. Obtain a plot of original as well as Equalized Histogram.   Intensity 0 1 2 3 4 5 6 7 No. of pixels 70 100 40 60 0 80 10 40	10
	(b)	A casual FIR system has three cascaded block, first two of them have individual Impulse response .h1 (n) = {1,2,2} h2  (n) =u(n)-u(n-2) Find Impulse response of third block .h1 (n), If an overall impulse response is h(n)={2,5,6,3,2,2}	10
3.	(a)	Explain in detail enhancement techniques in Spatial Domain used for images.	08
	(b)	Explain Homomorphic filtering in detail.	06
	(c)	Find the DFT of the given image.   0 1 2 1 1 2 3 2 2 3 4 3 1 3 2 3	06
4.	(a)	Define   (i) Eucledean distance   (ii) City block distance   (iii) Chess board distance   (iv) m. connectivity	10
	(b)	Find DFT of given sequence (Use DITFFT Algoritham) x(n)={1,2,3,4,4,3,2,1}	10
5.	(a)	Explain the method of segmentation of images by Region splitting and merging.	10
	(b)	Given below is the table of 8 symbol and their frequency of occurrences Give Huffman code for each symbol   Symbol S1 S2 S3 S4 S5 S6 S7 S8 Frequence 0.25 0.15 0.06 0.08 0.21 0.14 0.07 0.04	10
6.	(a)	Perform the convolution of the following two sequence using Z-transforms. x(n)= (0.2) u(n)=(0.3) u(n)	08
	(b)	Find inverse Z-Transform H(z) = 1/ [1 - 3z-1 + 0.5 z-2]     [ z ] > 1	06
	(c)	What is difference between image restroration and image enhancement? What do they have in common	06
7.	write short notes on :-		20
	(a)	Discrete Cosine Transform
	(b)	Sampling and Quantization
	(c)	Hough Transform
	(d)	Wavelet Transform