Digital Imaging MCQs

Digital Imaging MCQs

These Digital Imaging multiple-choice questions and their answers will help you strengthen your grip on the subject of Digital Imaging. You can prepare for an upcoming exam or job interview with these 60+ Digital Imaging MCQs.
So scroll down and start answering.

1: Which of the following statement is not true?

A.   Any color can be matched by mixing at the most three colored lights.

B.   The luminance of a color mixture is equal to the sum of the luminance of its components.

C.   The human eye can resolve the components of a color mixture.

D.   A color match at one luminance level holds over a wide range of luminances.

2: A CRO screen has 10 divisions on the horizontal line. If a voltage signal 5sin(314t + 45) is examined with a line base setting of 5 ms/divisions, the number of cycles in the signal displayed on the screen will be_______.

A.   0.5

B.   2.5

C.   5

D.   10

3: A compandor is a

A.   comparator-expander

B.   compressor-expander

C.   comparator-modulator

D.   compressor-demodulator


A certain oscilloscope with a 4cm by 4cm screen has its sweep output fed to its input. If the x and y sensitivities are the same, the oscillosope will display a_______.


triangular wave


diagonal line


sine wave



5: In the image representation , a picture-element is also called a _____.

A.   bit

B.   pixel

C.   dit

D.   point

6: In which of the following image segmentation techniques are quad- trees used?

A.   Feature extraction

B.   Segmentation

C.   Classification

D.   None of the above

7: Which of the following is a linear filtering method?

A.   Wiener filter

B.   FIR filter

C.   Kalman filter

D.   All of the above

8: Which of the following is an image data compression technique?

A.   Pixel coding

B.   Predictive coding

C.   Transform coding

D.   All of the above

9: Which of the following is an application of the digital image processing?

A.   Geographical mapping

B.   Prediction of agricultural crops

C.   Weather forecasting

D.   All of the above

10: Inter-frame coding technique exploits the ______ between successive frames.

A.   gaps

B.   redundancy

C.   time

D.   space

11: Which of the following types of photoreceptors does the retina of the human eye contain?

A.   rods and cones

B.   cones and lens

C.   rods and lens

D.   lens and eyelid

12: In which of the following processes is the binary ladder used?

A.   Analog to digital conversion

B.   Digital to analog conversion

C.   Analog to analog conversion

D.   Digital to digital conversion

13: To read the RMS value of which of the following waveforms are true RMS reading voltmeters used?

A.   Only the sinusoidal waveform

B.   Only the non-sinusoidal waveform

C.   Both a and b

D.   Only the square waveform

14: White Block Skipping (WBS) is a method used for_______.

A.   image filtering

B.   image compression

C.   image sampling

D.   image perception

15: What is the range of wavelength of the light in the visible region?

A.   150nm to 250nm

B.   380nm to 750nm

C.   350mm to780 mm

D.   350um to 780um


 Which of the following statements represents the Bloch's law?

A.   Light flashes of different duration but equal energy are indistinguishable.

B.   When a slowly flashing light is observed, the individual flashes are distinguishable.

C.   The eye is more sensitive to the flickering of high spatial frequencies than low spatial frequencies

D.   All of the above

17: On how many input samples does the zero memory quantizer operate at a time?

A.   One input sample

B.   Zero input sample

C.   Two input samples

D.   Four input samples

18: The Wiener filter can be implemented in the frequency domain via_______.

A.   fast binary transform

B.   slow binary transform

C.   fast unitary transform

D.   slow unitary transform

19: For which of the following image data compression techniques is PCM used as a method?

A.   Predictive coding

B.   Transform coding

C.   Pixel coding

D.   Color image coding

20: For which of following techniques is vector quantization used as a method?

A.   Image perception

B.   Image segmentation

C.   Image compression

D.   Image sampling

21: The term digital image generally refers to the processing of a _____.

A.   two-dimensional picture

B.   three-dimensional picture

C.   one-dimensional picture

D.   All of the above

22: Under which of the following conditions is the phenomenon called contouring used?

A.   If the number of quantization levels is more than that required in gray scale quantization.

B.   If the number of quantization levels is less than that required in grey scale quantization.

C.   When there is not a single level of quantization in gray scale quantization. All of the above

23: Which of the following filters is used for image restoration?

A.   Matched filter

B.   Dumb filter

C.   Weiner filter

D.   Band stop filter

24: Which of the following effects shows that brightness is not a monotonic function of luminance?

A.   Background law

B.   Dark shadow effect

C.   Mach band effect

D.   Power band effect

25: In the structural patterns of the surfaces of which object is texture observed?

A.   Wood

B.   Cloth

C.   Grain

D.   All of the above

26: Which of the following is an image restoration model?

A.   Noise model

B.   Sampled observation model

C.   Iimage formation model

D.   All of the above

27: Which of the following is an advantage of the vacuum tube voltmeter over the transistorized voltmeter (TVM)?

A.   The VTVM requires warm-up time

B.   The VTVM has high input impedance

C.   The power consumption of the VTVM is more in comparison with the TVM

D.   The VTVM cannot be operated on a low voltage source

28: Which of the following can be termed a two- tone image?

A.   Line drawings

B.   Letters

C.   Newsprints

D.   All of the above

29: To which of the following types does Weiner filtering belong?

A.   Non-linear filters

B.   Linear filters

C.   Non-recursive filter

D.   Inverse filters

30: Contrast stretching is an_______.

A.   image restoration technique

B.   image enhancement technique

C.   image analysis technique

D.   image segmentation technique

31: Which type of target is there in the vidicon tube?

A.   Photoconductive

B.   Photo emissive

C.   Photosensitive

D.   All the above

32: Which of the following expressions can define the Q -factor of a coil?

A.   C/R

B.   R/C

C.   L/R

D.   R/L

33: In the intermediate region of illumination,both rods and cones are active and provide _____.

A.   photopic vision

B.   isotopic vision

C.   photographic vision

D.   mesopic vision

34: If two sinusoidal voltage signals, between 0 and 90 degree out of phase and of equal amplitude and equal frequencies: in a CRO are applied to the horizontal and vertical deflection plates, what shape will appear on the screen?


A straight line with 45 degree angle with +ve x-axis


An ellipse


A square


A straight line with 135 degree angle with +ve x-axis

35: Which type of vision is provided by the rods in the human eye?


Isotopic vision


Orthographic vision


Scotopic vision  


Isotropic vision

36: Which of the following techniques does Kalman filtering employs?

A.   Least square filtering

B.   Fourier domain filtering

C.   Recursive filtering

D.   Interpolation filtering

37: Two objects with different surroundings can have identical _______ but different ________.

A.   luminance, brightness

B.   brightness, luminance

C.   hue, brightness

D.   brightness, hue

38: Which of the following is a moment based feature of an image?

A.   Centre of mass

B.   Orientation

C.   Bounding rectangle

D.   All of the above

39: Which of the following is an image segmentation technique?

A.   Template matching

B.   Texture matching

C.   Boundary detection

D.   All of the above

40: Which of the following techniques is used in analog to digital (ADc)conversion?

A.   Ramp conversion

B.   Dual slope conversion

C.   Successive- approximation conversion

D.   All of the above

41: Which of the following is not an image filtering method?

A.   Speckle noise reduction

B.   Maximum entropy

C.   Bosch Method

D.   Bayesian method

42: The phenomenon in which overlapping of frequency spectrum takes place in sampling is called _______.

A.   Nyquist rate

B.   Aliasing

C.   Quantization

D.   Digitization

43: Which of the following methods is used to analyse the structure of patterns in image analysis?

A.   Medial axis transform

B.   Skeleton algorithms

C.   Thinning algorithm

D.   All of the above

44: Which of the following steps follows sampling in image digitization?

A.   Modulation

B.   Filtering

C.   Quantization

D.   Demodulation

45: Which of the following filters can effectively remove the aliasing effect?

A.   High pass filter

B.   Low pass filter

C.   Band pass filter

D.   Band stop filter

46: Of which of the following types is the general response of image detectors and recorders?

A.   Non-linear

B.   Linear

C.   Exponential

D.   None of the above

47: Which of the following is an image analysis technique?

A.   Feature extraction

B.   Segmentation

C.   Classification

D.   All of the above

48: About which of the following domains does image transform during image analysis provide information?

A.   Frequency domain

B.   Time domain

C.   Both frequency and time domain

49: Which of the following is not a method of predictive coding?

A.   Delta modulation

B.   Zonal coding

C.   Adaptive coding

D.   Interframe techniques

50: Which of the following is a type of digital voltmeters?

A.   Ramp type

B.   Dual slope integrating type

C.   Integrating type

D.   All of the above