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