DSIP Digital Signal & Image Processing MCQ's




Question 91 :
DFT of a discrete signal is ___ in nature

  1. Continuous
  2. Analog
  3. Discrete
  4. Aperiodic
  

Question 92 :
Laplacian operator is rotation invariant because

  1. it is two dmensional in nature
  2. it is one Dimentional in nature
  3. it rotates very fast with respect to the centre pixel
  4. Rotating the image and then applying the operator or roatating the operator and then applying on the image has the same effect
  

Question 93 :
In neighborhood operation for spatial filtering if a square mask of size n*n is used it is restricted that the center of mask must be at a distance ≥ (n – 1)/2 pixels from border of image, what happens to the resultant image?

  1. The resultant image will be of same size as original image
  2. The resultant image will be a little larger size than original image
  3. The resultant image will be a little smaller size than original image
  4. The resultant image will be smooth near the border
  

Question 94 :
Zero crossing operator use the following

  1. First derivative
  2. Second derivative
  3. Sobel operator
  4. Gaussian operator
  

Question 95 :
Thresholding is a special case of contrast stretching which generates

  1. High contrast image
  2. Binary image
  3. Low contrast image
  4. Dark image
  

Question 96 :
Spatial domain refers to

  1. Image plane itself and image processing methods are applied directly to one to one image pixels only
  2. Image plane itself and image processing methods that are not applied directly to image pixels.
  3. Image plane itself and image processing methods are applied directly to neighbouring pixels only.
  4. Image plane itself and image processing methods that are applied directly to both one to one image pixels and neighbouring pixels.
  

Question 97 :
The Walsh and Hadamard transforms are ___________in nature

  1. Sinusoidal
  2. Cosine
  3. non-sinusoidal
  4. cosine and sine
  

Question 98 :
The number of complex addition in direct DFT are

  1. N(N-1)
  2. N^2
  3. Nlog2 N
  4. (N/2)log2 N
  

Question 99 :
If ‘F’ is the frequency of the analog signal, then what is the minimum sampling rate required to avoid aliasing?

  1. F
  2. 2F
  3. 3F
  4. 4F
  

Question 100 :
The output signal when a signal x(n) ={0,1,2,3} is processed through an ‘Delay’ system is?

  1. {1,2,3}
  2. {0,1,2,3}
  3. {0,0,1,2,3}
  4. {2,3}
  

Question 101 :
An intensity levels of image can be viewed in the range of [0, L-1] is known as

  1. Truth Table
  2. Transformation function
  3. Histogram
  4. Intensity level transformation
  

Question 102 :
If the DFT {x(n)} = X(k) = {4, –2j, 0, 2j}, using properties of DFT, DFT of x(n-2) is

  1. (4, 2j, 0, -2j)
  2. (2 j, 0, -2j, 4)
  3. (4, 0, 2j, -2j)
  4. (0, 2j, 4, -2j)
  

Question 103 :
Periodic property of DFT says __________

  1. X( n + K )=X(K)
  2. X( k +N )=X(k)
  3. X( K + iN )=X(i)
  4. X( N + K )=X(n)
  

Question 104 :
DTFT is the representation of

  1. Periodic Discrete time signals
  2. Aperiodic Discrete time signals
  3. Aperiodic continuous signals
  4. Periodic continuous signals
  

Question 105 :
The technique of Enhancement that has a specified Histogram processed image as result, is called?

  1. Histogram Linearization
  2. Histogram Equalization
  3. Histogram Matching
  4. Histogram Linear Processing
  

Question 106 :
The procedure done on a digital image to alter the values of its individual pixels is

  1. Neighborhood Operations
  2. Image Registration
  3. Geometric Spatial Transformation
  4. Single Pixel Operation
  

Question 107 :
The circular convolution of two periodic signals represented by x1[n] = {2, 1, 2, -1} and x2[n] = {1, 2, 3, 4} is___________

  1. {10, 10, 10, 6}
  2. {10, 14, 10, 6}
  3. {10, 6, 10, 14}
  4. {10, 10, 6, 14}
  

Question 108 :
Under which conditions does an initially relaxed system become stable

  1. only if bounded input generates unbounded output
  2. only if bounded input generates bounded output
  3. only if unbounded input generates unbounded output
  4. only if unbounded input generates bounded output
  

Question 109 :
If x(n) is a discrete-time signal, then the value of x(n) at non integer value of ‘n’ is:

  1. Zero
  2. Positive
  3. Negative
  4. Not defined
  

Question 110 :
Run Length Encoding is used for

  1. Reducing the repeated string of characters
  2. Bit error correction
  3. Correction of error in multiple bits
  4. Increasing the repeated string of characters
  

Question 111 :
Histogram processing looses _____ of the pixels of an image.

  1. information
  2. intensity
  3. position
  4. content
  

Question 112 :
Continuous functions are sampled to form a

  1. Fourier series
  2. Fourier transform
  3. Fast Fourier series
  4. Digital image
  

Question 113 :
What is the effect of equalizing an already equalized histogram?

  1. Number grey levels reduced
  2. No Change on histogram
  3. Number grey levels increased
  4. New grey levels gets added
  

Question 114 :
Which of the following is not image representation technique

  1. Chain Code
  2. Signature
  3. Shape Number
  4. Dilation
  

Question 115 :
In overlap save method the number of first samples that we discard are

  1. N
  2. N-1
  3. N-2
  4. N-3
  

Question 116 :
For N point FFT there are ____complex additions

  1. N/2 log2N
  2. N/2
  3. Nlog2N
  4. N
  

Question 117 :
The total energy of a discrete time signal is

  1. zero
  2. negative
  3. infinite
  4. finite
  

Question 118 :
Refresh rate is measured in

  1. mbps
  2. hertz
  3. kilo hertz
  4. mega hertz
  

Question 119 :
If the DFT {x(n)} = X(k) = {4, –2j, 0, 2j}, using properties of DFT, DFT of x(-n) is

  1. (4, 2j, 0, -2j)
  2. (2j, 0, -2j,4)
  3. (4, 0, 2j, -2j)
  4. (0,2 j, 4, -2j)
  

Question 120 :
Term which refers to the sharpness or clarity of an image, is________

  1. Pitch
  2. Pixel
  3. Resolution
  4. Signal
  
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