Digital Signal And Image Processing MCQ

Question 51 : Which of the following is not among the type of architectures used for DSP processors

1. Von Neumann
2. Harvard
3. SISD
4. Modified Harvard

Question 52 : What is the expanded form of JPEG?

1. Joint Photographic Expansion Group
2. Joint Photographic Experts Group
3. Joint Photographs Expansion Group
4. Joint Photographic Expanded Group

Question 53 : A majority of DSP processor are of what type

1. CISC
2. RISC
3. SISD
4. SIMD

Question 54 : The N-point DFT of a L-point sequence will have a periodicity of ____ samples

1. N
2. L
3. N(N-1)
4. N * N

Question 55 : Auto correlation of x(n) = [ 4, 3, 2, 1 ] and its value at lag=0 are

1. [4, 11, 12, 30, 20, 12,4] and 30
2. [4, 11, 20, 30, 20, 12,4] and 30
3. [3, 11, 20, 30, 20, 12,3] and 20
4. [4, 11, 20, -30, 20, 12,4] and 11

Question 56 : A random signal is the one

1. which is discrete in time
2. which is discrete in value
3. which varies with respect to only single variable
4. which can not be represented using an equation or a set of rules

Question 57 : The total energy of a discrete time signal is

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

Question 58 : For structuring elements, its origins is at

1. top left
2. top right
3. Center
4. bottom left

Question 59 : 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 60 : 4- point DFT requires a total of

1. 12 multiplications and 10 additions
2. 10 multiplications and 8 additions
3. 16 multiplications and 12 additions
4. 14 multiplications and 12 additions

Question 61 : Point, line, edge detectors are based on ____ of an image

1. Similarity
2. equality
3. discontinuities
4. nature

Question 62 : Hough transform is used for finding

1. Finding points in image
2. Finding lines in image
3. Finding objects in image
4. Finding moments of an image

Question 63 : Histogram processing looses _____ of the pixels of an image.

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

Question 64 : Which block of the discrete time systems requires memory in order to store the previous input?

1. Adder
2. Signal Multiplier
3. Unit Delay
4. Unit Advance

Question 65 : What does Lossy Compression do to files?

1. Increases the file size and keeps the same quality
2. Eliminates no information at all
3. Decreases the file size and keeps the same quality
4. Eliminates unnecessary information in a file to reduce file size

Question 66 : Which is true about bit plane slicing?

1. Highest order plane contains most of the information of an image
2. Lowest order plane contains most of the information of an image
3. Mid order plane contains most of the information of an image
4. All plane contains equal information of an image

Question 67 : Refresh rate is measured in

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

Question 68 : A system is said to be shift invariant only if_

1. a shift in the input signal also results in the corresponding shift in the output
2. a shift in the input signal does not exhibit the corresponding shift in the output
3. a shifting level does not vary in an input as well as output
4. a shifting at input does not affect the output

Question 69 : The quality of output signal from a A/D converter is measured in terms of:

1. Quantization error
2. Quantization to signal noise ratio
3. Signal to quantization noise ratio
4. Conversion constant

Question 70 : FFT may be used to calculate

1. DFT
2. Laplace transform
3. Direct Z transform
4. In direct Z transform

Question 71 : In normalized histogram sum of all the values is equal to

1. 2
2. 1
3. 0
4. -1

Question 72 : If the output of the system of the system at any 'n' depends only the present or the past values of the inputs then the system is said to be:

1. Linear
2. Non-Linear
3. Causal
4. Non-causal

Question 73 : Smoothening filter is used to

1. Remove low frequency regions from an image
2. Remove high frequency regions from an image
3. Enhance high frequency regions in an image
4. Improve the contrast of an image

Question 74 : 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 75 : DFT is applied to

1. Infinite sequences
2. Finite discrete sequences
3. Continuous infinite signals
4. Continuous finite sequences

Question 76 : Compute linear convolution of sequence x(n) = {1, 3, 2, 4, 4, 2, 3, 1} and h(n)={1, –1, 1} using overlap save method.

1. y(n) = {1,0, 0, 5, 2, 2, 5, 0, 2, 1}
2. y(n) = {1, 5, 0, 5, 2, 2, 5, 0, 2, 1}
3. y(n) = {1, 2, 0, 5, 2, 2, 5, 0, 2, 1}
4. y(n) = {1, 1, 0, 5, 2, 2, 5, 0, 2, 1}

Question 77 : 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 78 : Which of the following is true regarding the number of computations required to compute an N-point DFT?

1. N2 complex multiplications and N(N-1) complex additions
2. N2 complex additions and N(N-1) complex multiplications
3. N2 complex multiplications and N(N+1) complex additions
4. N2 complex additions and N(N+1) complex multiplications

Question 79 : 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 80 : What will be the linear convolution of the sequences x(n)={1,2} and h(n)={2,1} using DFT.

1. {2, 2, 5}
2. {5, 2, 5}
3. {2, 5, 2}
4. {5, 5, 2}

Question 81 : DTFT is the representation of

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

Question 82 : Logarithmic Transformation is

1. Used to expand the values of dark pixels in an image while compressing the higher-level values.
2. Used to compress the values of dark pixels in an image while expanding the higher-level values
3. Used to compress the dynamic range of images with small variations in pixel values.
4. Used to expand the dynamic range of image with large variations in pixel values

Question 83 : What is the basic difference between general purpose and DSP processor

1. More costly
2. Complex design
3. Processes in real time
4. Less reliable

Question 84 : DTFT is the representation of

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

Question 85 : 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 86 : Which of the following techniques of boundary descriptions have the physical interpretation of boundary shape?

1. Fourier transform
2. Statistical moments
3. Laplace transform
4. Curvature

Question 87 : The applications which use overlap add method are except

1. Digital audio
2. Telephone signals
3. Echo cancellation
4. Image signals

Question 88 : 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 89 : The following are speech coding techniques except

1. Huffman Coding
2. Pulse Code Modulation
3. Linear Predictive Coding
4. Transform Coding

Question 90 : Calculate the minimum sampling rate to avoid aliasing when a continuous time signal is given by x(t) = 5 cos 200πt

1. 100 Hz
2. 200 Hz
3. 250 Hz
4. 400 Hz

Question 91 : In terms of image enhancement, what does mean and variance refers to?

1. Average contrast and average gray level respectively
2. Average gray level and average contrast respectively
3. Average gray level in both
4. Average contrast in both

Question 92 : Fourier transform of unit impulse at origin is

1. Undefined
2. Infinity
3. 1
4. 0

Question 93 : Which of the following step deals with tools for extracting image components those are useful in the representation and description of shape?

1. Segmentation
2. Representation & description
3. Compression
4. Morphological processing

Question 94 : Histogram equalization is used to

1. Enhance the contrast of an image
2. Remove the noises present in an image
3. Find the contours present in an image
4. Find the equality present in various regions.

Question 95 : 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 96 : Condition for splitting an image is

1. Difference of any two pixel values should be less than threshold values
2. Difference of any two pixel values should be greater than equal to threshold values
3. Difference of maximum pixel value and minimum pixel value should be less than threshold values
4. Difference of maximum pixel value and minimum pixel value should be greater than threshold values

Question 97 : JPEG format is useful when ___________

1. There are so many colors in the picture
2. There are not so many colors in the picture
3. To show more brightness
4. To show haziness

Question 98 : If we perform Opening on images then it smooths the image's

1. Pixels
2. Lines
3. Contour
4. Boundary

Question 99 : 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 100 : In which case power law of transformation is used

1. purification
2. industry
3. radar
4. MRI