Kerala University 2011 B.E Electronics and Instrumentation Engineering Seventh semester b-tech on image processing - Question Paper

7th SEMESTER B-TECH. DEGREE EXAMINATION,APRIL/MAY 2011

03.705 Elective-III:IMAGE PROCESSING

Time:3Hours Max.Marks100

Instructions:1)Answer all ques. from Part A
2)Answer any two ques. from Part B

PART-A [10*4=40 marks]

1.a)Discuss the convolution of 2 dimensional sequences.

b)Compare two dimensional Fourier transform and Cosine transforms.

c)Briefly discuss how we can convert RGB in to HSV model.

d)Define Sampling theorem for random fields.

e)Explain contrast stretching.

f)Discuss median filtering technique.

g)Briefly discuss false colouring.

h)Define pseudo and inverse pseudo filter transfer function.

i)Discuss the algorithm to obtain the global threshold.

j)What are the lossy compression methods?


PART B [6*10=60 Marks]

Module-I


2) discuss the perspective projection system and its properties.

3)Explain the two dimensional DFT and its properties.

4)Explain the two dimensional sampling and reconstruction.


Module-II


5)Show that subtracting the laplacian from an image is proportional to unsharp marking.

6)Suppose that you form a low pass spatial filter that averages the four immediate neighbours of a point(x,y) but excludes the point itself.Find the equivalent filter H(u,v) in the frequency domain.

7)Prove that the gradient of an image intensity due to sobel operator along horizontal direction can be found by convolving the image by[1 1] followed by [1 1] followed by the transpose of[-1 0 1] and then scaling the outcome by 1/4.


Module-III


8)Describe the digital implementation of the wiener filter with necessary diagram.

9)Describe the region growing technique for image segmentation and mention the issues associated with it .

10)Briefly discuss coding redundancy,Inter Pixel redundancy and Psycho visual redundancy.

Earning:   Approval pending.