Question 1 : The number of complex addition in direct DFT are
- N(N-1)
- N^2
- Nlog2 N
- (N/2)log2 N
Question 2 : The circular convolution of two sequences in time domain is equivalent to
- Multiplication of DFTs of two sequences
- Summation of DFTs of two sequences
- Difference of DFTs of two sequences
- Square of multiplication of DFTs of two sequences
Question 3 : Which among the following operations is/are not involved /associated with the computation process of linear convolution?
- Folding Operation
- Shifting Operation
- Multiplication Operation
- Integration Operation
Question 4 : Human sounds cannot be characterized with which parameter
- Pitch
- Sensitivity
- Loudness
- Quality
Question 5 : Giving one period of the periodic convolution is called
- Periodic convolution
- Aperiodic convolution
- Correlation
- Circular convolution
Question 6 : First difference of smallest magnitude is called as
- Shape number
- Euler Number
- Chain Code
- Signature
Question 7 : The output signal when a signal x(n) ={0,1,2,3} is processed through an βDelayβ system is?
- {1,2,3}
- {0,1,2,3}
- {0,0,1,2,3}
- {2,3}
Question 8 : Zero crossing operator use the following
- First derivative
- Second derivative
- Sobel operator
- Gaussian operator
Question 9 : The overlap save method is used to calculate
- The discrete convolution between a sampled signal and a finite impulse response (FIR) filter
- The discrete convolution between a sampled signal and an infinite impulse response (IIR) filter
- The discrete convolution between a very long signal and a finite impulse response (FIR) filter
- The discrete convolution between a very long signal and a infinite impulse response (IIR) filter
Question 10 : DFT of a discrete signal is ___ in nature
- Continuous
- Analog
- Discrete
- Aperiodic
Question 11 : The 4-point DFT of {1,1,0,0} is
- { 2, 1-j, 0, 1+j }
- { -2, 1-j, 0, 1+j }
- { 4, 1-j, 0, 1+j }
- { -2, 1-j, 0, 1-j }
Question 12 : While performing negative of a 3 bpp image the pixel value '5' will transform to
- 2
- 5
- 8
- 0
Question 13 : Which of the following is not image representation technique
- Chain Code
- Signature
- Shape Number
- Dilation
Question 14 : Using gray-level transformation, the basic function linearity deals with which of the following transformation?
- Log and inverse-log transformations
- Negative and identity transformations
- nth and nth root transformations
- Power-law transformations
Question 15 : Which condition determines the causality of the LTI system in terms of its impulse response?
- Only if the value of an impulse response is zero for all negative values of time
- Only if the value of an impulse response is unity for all negative values of time
- Only if the value of an impulse response is infinity for all negative values of time
- Only if the value of an impulse response is negative for all negative values of time
Question 16 : If the impulse response the system is of infinite duration then it is called
- FIR system
- IIR system
- IFR system
- IIF system
Question 17 : If the DFT {x(n)} = X(k) = {4, β2j, 0, 2j}, using properties of DFT, DFT of x(-n) is
- (4, 2j, 0, -2j)
- (2j, 0, -2j,4)
- (4, 0, 2j, -2j)
- (0,2 j, 4, -2j)
Question 18 : Example of Region Growing Methods is
- Level Set Methods
- Graph Partitioning Methods
- Watershed Transformation
- Neural Networks Segmentation
Question 19 : Which transformations are useful for general-purpose contrast manipulation
- Power law transformations
- Identity transformation
- Negative transformation
- Logarithmic transformation
Question 20 : If a signal x(n) is passed through a system to get an output signal y(n) =x(n+1), then the signal is said to be
- Delayed
- Advanced
- No operation
- Inversed
Question 21 : In formula G(x,y) = T[F(x,y)], T is the
- Transformed Image
- Transformed Vector
- Transformation function
- Transformation theorem
Question 22 : DFT of the sequence x(n)={ 1, -2, 3, 2}
- {4, -2+j4, 4, -2+j4 }
- {4, -2+j4, 4, -2-j4 }
- {-4, -2-j4, 4, 2-j4 }
- {4, -2-j4, -4, -2-j4 }
Question 23 : Which of these is not a property of two-dimensional DFT
- Symmetric
- Periodic extensions
- Sampled Fourier transform
- Linearity
Question 24 : Term which refers to the sharpness or clarity of an image, is------------
- Pitch
- Pixel
- Resolution
- Signal
Question 25 : The interface between an analog signal and a digital processor is
- D/A converter
- A/D converter
- Modulator
- Demodulator
Question 26 : Continuous functions are sampled to form a
- Fourier series
- Fourier transform
- Fast Fourier series
- Digital image
Question 27 : A good representation of the derivative of a step function u(t) is...
- Another step function
- A complex exponential
- A ramp mt, where m is the slope.
- A delta function Ξ΄(t)
Question 28 : To reduce the effect of aliasing high frequencies are
- Attenuated
- Accentuated
- Reduced
- Removed
Question 29 : Which filter is best to remove salt and pepper noise?
- Low pass
- Sobel
- Median
- Laplacian
Question 30 : DWT stands for
- Discrete wavelet transform
- Discrete wavelet transformation
- Digital wavelet transform
- Digital wavelet transformation
Question 31 : The Walsh and Hadamard transforms are ___________in nature
- Sinusoidal
- Cosine
- non-sinusoidal
- cosine and sine
Question 32 : Which of the following should be done in order to convert a continuous-time signal to a discrete-time signal?
- Sampling
- Differentiating
- Integrating
- Quantization
Question 33 : Run Length Encoding is used for
- Reducing the repeated string of characters
- Bit error correction
- Correction of error in multiple bits
- Increasing the repeated string of characters
Question 34 : If the DFT {x(n)} = X(k) = {4, β2j, 0, 2j}, using properties of DFT, DFT of x(n-2) is
- (4, 2j, 0, -2j)
- (2 j, 0, -2j, 4)
- (4, 0, 2j, -2j)
- (0, 2j, 4, -2j)
Question 35 : Which of the following condition should hold true for a signal x[n] to be odd?
- x[-n] = x[n] β’ x[n]
- x[n] = -x[-n]
- x[n] = [x[n]]3
- x[n] = x[n]
Question 36 : Computation of linear filtering of a sequence using FFT algorithm requires no. of complex additions are
- (N/2)logN
- 2NlogN [Base=2]
- (N/2)logN [Base=2]
- NlogN [Base=2]
Question 37 : If sampling frequency is below Nyquist frequency , distortion in the present sprectra due to other spectra in the frequency domain is called as ____
- Discrete Fourier Transform
- Nyquist β Shannon sampling theory
- Aliasing
- Up sampling
Question 38 : Which segmentation technique is based on clustering approaches?
- K-means algorithm
- Threshold based algorithm
- Histogram based algorithm
- Edge detection based algorithm
Question 39 : Image transforms are needed for
- conversion information form spatial to frequency
- spatial domain
- time domain
- frequency domain
Question 40 : For the Dissemination-in-time FFT algorithm, which of the following is true?
- Both input and output are in order.
- Both input and output are shuffled.
- Input is shuffled and output is in order.
- Input is in order and output is shuffled.
Question 41 : In neighborhood processing methods
- All the pixels in the neighborhood are processed at a time
- A pixel in the neighborhood is processed using the current pixel
- A pixel is processed using all the pixels within the neighborhood
- A pixel is processed using its own current value
Question 42 : Which of the following property makes it possible to calculate 2D DFT using 1D DFT?
- conjugate symmetry
- Separability
- Time shift
- Periodicity
Question 43 : Periodic property of DFT says __________
- X( n + K )=X(K)
- X( k +N )=X(k)
- X( K + iN )=X(i)
- X( N + K )=X(n)
Question 44 : If a discrete time signal x(n) of length l is convolved with a discrete time signal y(n) of length n then the length of output signal is
- l+n-1
- l-n+1
- l*n
- l*n-1
Question 45 : Convolution of two functions means rotating one function at angle of
- 360
- 270
- 90
- 180
Question 46 : Speech recognition system consists of the following except
- Microphone
- DAC
- Pattern matching
- Parameter extraction
Question 47 : DFT of a signal is a lossy process.
- No
- Yes
- May be
- No way to decide
Question 48 : Which is a colour attribute that describes a pure colour?
- Saturation
- Hue
- Brightness
- Intensity
Question 49 : 2D Fourier transform and its inverse are infinitely
- Aperiodic
- Periodic
- Linear
- Non linear
Question 50 : Under which conditions does an initially relaxed system become stable
- only if bounded input generates unbounded output
- only if bounded input generates bounded output
- only if unbounded input generates unbounded output
- only if unbounded input generates bounded output