Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 7th Sem 2171712 Image Processing Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?VII (NEW) EXAMINATION ? WINTER 2020
Subject Code:2171712 Date:28/01/2021
Subject Name:Image Processing
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) How correlation is useful for object matching ?
03
(b) The following figure shows an 8-bit image of size 5 x 5, with x and y
04
coordinates specified.
x\ y->
0
1
2
3
4
0
170
160 20
55
90
1
220
210 60
65
55
2
120
25
89
81
145
3
235
255 84
55
180
4
250
220 70
50
170
Compute the following:
(i)
The output of a 3 ? 3 mean filter at (1,1). Write the filter
mask?
(ii)
The output of a 3 ? 3 median filter at (2,1).
(c) The following figure shows an 8-bit input image (original) of size 4 x
07
4, with x and y coordinates specified. This image is to be displayed on
CRT screen having value of gamma 2.5.
What will be the displayed 4 x 4 output image on CRT screen ? What
is the effect of gamma on output image?
x\ y->
0
1
2
3
0
120
150 250 85
1
100
150 75
75
2
200
255 88
88
3
250
154 120 76
(Hint: s=c r gamma ,c=1; pixel intensities should always be in 8-bit range)
Q.2 (a) What is the difference between lossy compression and lossless
03
compression?
(b) Compare the effects of ideal and Gaussian low pass filter on images in
04
frequency domain with proper justification.
(c) What do you mean by isotropic filters? Derive the filter mask of
07
Laplacian which considers horizontal, vertical and diagonal directions.
What is the use of this mask in image processing?
Q.3 (a) Explain basic concepts of image sampling and quantization.
03
(b) Find out storage requirements to store 50 true color images (24 bits per
04
pixel) where each image has size of 512 x 512 pixels.
(c) Explain periodic noise reduction in images by frequency domain
07
filtering. Discuss a practical application of the same.
1
Q.4 (a) What is hole filling algorithm? What is its application ?
03
(b) With the help of necessary equations explain a simple image formation
04
model.
(c) Explain RGB and CMY color models, and their relationship.
07
Q.5 (a) What is the use of thresholding in image segmentation ?
03
(b) What is the advantage of morphology operation dilation over low pass
04
filtering in binary images?
(c) Given a 5x5 pixel image and respective pixel values (8-bit code for each
07
pixel) below, (i) Calculate the respective Huffman codes for each
symbol (each pixel value) of the given image, (ii) What is the
compression ratio achieved by employing Huffman coding instead of
8-bit fixed length coding?
180 160 160 140 120
110 110 120 140 120
110 140 120 120 140
120 160 160 170 170
170 120 110 140 110
Q.6 (a) List and discuss any one basic data redundancy in brief.
03
(b) List various image processing steps involved in automatic license plate
04
number detection of car. What are the challenges ?
(c) Define dilation and erosion. For the binary image segment of size 4x4
07
and structuring element of size 3x3 shown below, find dilation and
erosion outputs.
1
1
1 0
1
1
1
1
1
1 1
1
1
1
1
1
1 0
1
1
1
1
1
1 1
Q.7 (a) Explain separability property of 2-D transform.
03
(b) Discuss Bayes classifier for Gaussian pattern classes.
04
(c) With the help of figures and equations discuss the role of illumination
07
in histogram distortion.
Q.8 (a) Find 2D convolution between x and h (x*h) shown below.
03
x=
0
0
0
0
0
0
1
0
0
0
0
0
0
0
2
0
0
0
0
0
2
0
0
0
0
h=
1
2
3
4
5
6
7
8
9
(b) Discuss an application of image processing in process industries.
04
(c) With the help of necessary equations and filter masks discuss various
07
horizontal, vertical and diagonal edge detector operators in detail.
************
2
This post was last modified on 04 March 2021