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WorksheetsDIGITAL IMAGE PROCESSING
Total questions: 50
Worksheet time: 25mins
For an image f(x,y), the amplitude at any position x,y is called(Answer all the correct options)
binary level
Intensity
Gray level
decimal level
Digital imaging is done using
Gamma rays
X-rays
UV/IR rays
visible light
All the above
MACH band effect is about
actual intensity
perceived intensity
Computer vision is
low-level image processing
Middle-level image processing
Higher-level image processing
•In _____ filters the low frequencies are preserved.
a)High-pass
b)Low-pass
c)High –reject
d)Low-reject
•In noise reduction ________ filters are used.
A) Sharpening filters
B) Smoothing filters
C) Both a & b
D) None of the above
•ILPF stands for
a)Ideal Low pass filter
b) Identical Low pass filter
c) Intensity Low pass filter
d) Increased Low pass filter
The Euclidean Distance between a point p with co-ordiantes (0,0) and a point q with coordinates (3,3) is
sqrt(18)
18
9
3
How does picture formation in the eye vary from image formation in a camera?
Fixed focal length
Varying distance between lens and imaging plane
No difference
Variable focal length
Which of the following statement describe the term pixel depth?
It is the number of units used to represent each pixel in RGB space
It is the number of mm used to represent each pixel in RGB space
It is the number of bytes used to represent each pixel in RGB space
It is the number of bits used to represent each pixel in RGB space
If each element of set X is also an element of set Y, then X can be called __ of set Y.
Union
Subset
Disjoint
Complement Set
What is meant by Region of Interest (ROI) operations?
Dilation
Masking
Shading correction
None of the above
What is the output of a smoothing, linear spatial filter?
Median of pixels
Maximum of pixels
Minimum of pixels
Average of pixels
Smoothing filter is used to remove __ from an image.
Smooth transitions of brightness levels
Smooth transitions of grey levels
Sharp transitions of brightness levels
Sharp transitions of grey levels.
Which of the following is the disadvantage of a smoothing filter?
Blur inner pixels
Blur edges
Sharp edges
Remove sharp transitions
Which of the following is the correct application of image blurring?
Gross representation
Object motion
Object detection
Image segmentation
Median filters belong to which category of filter?
Frequency Domain Filter
Order Static Filter
Linear Spatial Filter
Sharpening Filter
Which of the following is the correct representation of log transformation?
s=clog10(1+r)
s=clog10(1-r)
s=clog10(1/r)
s=clog10(1*r)
Which of the following requires to specify the information at the time of input?
Power transformation
Log transformation
Linear transformation
Piece-wise transformation
What is the smallest possible value of the gradient image?
1
0
e
-e
What is the name of the process that moves a filter mask over the image, followed by calculating the sum of products?
Correlation
Convolution
Linear spatial filtering
Non-linear spatial filtering
Which of the following fact is true for an image?
An image is the subtraction of the illumination component from the reflectance component.
An image is the multiplication of the illumination and reflectance component.
An image is the addition of illumination and reflectance component
An image is the subtraction of the reflectance component from the illumination component
Which of the following operations is used in homographic filtering for converting the input image to discrete Fourier transformed function?
Exponential Function
Logarithmic Function
Negative Function
None of the above
What is the name of the class that accepts an image’s separation of luminesce and reflectance component?
Homomorphic system
Base class system
Base separation system
All of the above
Given an intensity level [0, L-1] with “r” and “s” positive values, how will the negative of an image obtain?
s = L – 1 – r
s = L – 1 + r
s = L + 1 – r
s = L + 1 + r
Which of the following image component abruptly diverges at a certain junction of distinct objects?
Reflectance component
Illumination component
Both (a) and (b)
None of the above
Which of the following is the correct definition of Gamma correction?
Light brightness variation
Power-law response phenomenon
Inverted intensity curve
None of the above
What is the name of the process that highlights an image’s intensity?
Intensity Highlighting
Intensity Matching
Intensity Slicing
None of the above
What is the name of the process, which reverses the image’s intensity?
Piecewise Linear Transformations
Image Negatives
Log Transformations
None of the above
Which of the following grey level intensities help in increasing the grey levels dynamic range in the image?
Contrast Stretching
Negative Transformations
Power-law Transformations
None of the above
Which of the following technique is used to obtain a certain range of bits required to quantize each pixel?
Contouring
Bit-plane slicing
Grey-level slicing
Contrast stretching
In which of the following areas can we use the low pass filters?
Machine perception, along with some application of character recognition
Printing and publishing industry
Satellite processing and aerial images
All of the above
A binary Image has _________ pixel.
8-bits
1-bit
2-bits
3-bits
A Gray Image has _________ per pixel.
1-bit
2-bits
4-bits
8-bits
A color Image has _________ per pixel.
1-bit
8-bits
24-bits
8-bytes
Image contrast enhancement is ____________ process
Low-level
Mid-Level
High-level
Not a
What is dpi?
dots per inch
digits per inch
digital pixel information
none of these
The range of values spanned by the gray scale
Dynamic range
Band range
Peak range
Resolution range
To convert a continuous sensed data into Digital form, which of the following is required?
Sampling
Quantization
Both Sampling and Quantization
none
After digitization process a digital image with M rows and N columns have to be positive and for the number, L, max gray levels i.e. an integer power of 2 for each pixel. Then, the number b, of bits required to store a digitized image is:
b=M*N*k
b=M*N*L
b=M*L*k
b=L*N*k
The quality of a digital image is well determined by ___________
The number of samples
The discrete gray levels
Both options
None
Digitizing amplitude values is called
radiance
illuminance
sampling
quantization
Discernible change in intensity level of image is
wide domain
spatial domain
frequency domain
algebraic domain
If S is a subset of pixels, pixels p and q are said to be ____________ if there exists a path between them consisting of pixels entirely in S.
continuous
adjacent
connected
none of the Mentioned
The distance between pixels p and q, the pixels have a distance less than or equal to some value of radius r centred at (x,y) is called :
Euclidean distance
City-Block distance
Chessboard distance
None of the Mentioned
Which of the following is NOT is not a type of Adjacency?
4-Adjacency
8-Adjacency
m-Adjacency
None of the Mentioned
A geometry consisting of in-line arrangement of sensors for image acquisition
A photodiode
Sensor strips
Sensor arrays
CMOS
The histogram of a digital image with gray levels in the range [0, L-1] is represented by a discrete function:
h(r_k)=n_k
h(r_k )=n/n_k
p(r_k )=n_k
h(r_k )=n_k/n
Which of the following conditions does the T(r) must satisfy?
T(r) is double-valued and monotonically decreasing in the interval 0≤r≤1; and
0≤T(r)≤1 for 0≤r≤1
T(r) is double-valued and monotonically increasing in the interval 0≤r≤1; and
0≤T(r)≤1 for 0≤r≤1
T(r) is single-valued and monotonically decreasing in the interval 0≤r≤1; and
0≤T(r)≤1 for 0≤r≤1
T(r) is single-valued and monotonically increasing in the interval 0≤r≤1; and
0≤T(r)≤1 for 0≤r≤1
