In this article, we will discuss the most commonly asked multiple-choice questions related to Digital Image Processing.

The main purpose of writing this article is to target competitive exams and interviews. Here, we will cover all the frequently asked Digital Image Processing questions with the correct choice of answer among various options.

1) At what points, a continuous image is digitized?

  1. Sampling
  2. Vertex
  3. Contour
  4. Random

Answer: a) Sampling points

Explanation: Sampling is a process of reducing continuous-time signals to discrete-time signals.

2) ________ represents the transition between image function’s continuous values and its digital equivalent.

  1. Rasterization
  2. Quantization
  3. Sampling
  4. None of the above

Answer: a) Quantization

Explanation: Quantization is a mechanism that involves the conversion of a continuous range of values into a finite range of discrete values.

3) Which of the following correctly describes the slightest visible change in the level of intensity?

  1. Contour
  2. Saturation
  3. Contrast
  4. Intensity Resolution

Answer: d) Intensity Resolution

Explanation: Intensity resolution can be defined as the total number of bits required to quantize an image.

4) What is the name of the tool that helps in zooming, shrinking, rotating, etc.?

  1. Filters
  2. Interpolation
  3. Sampling
  4. None of the above

Answer: b) Interpolation

Explanation: Interpolation is one such basic tool that is used to zoom, shrink, rotate, etc.

5) The dynamic range of the imaging system is a quantitative relation where the upper limit can be determined by

  1. Brightness
  2. Contrast
  3. Saturation
  4. Noise

Answer: c) Saturation

Explanation: Saturation is taken as a numerator.

6) The lower limit of the dynamic range ratio can be determined by

  1. Brightness
  2. Contrast
  3. Saturation
  4. Noise

Answer: d) Noise

Explanation: Noise is taken as a denominator.

7) Which of the following is the most famous single sensor utilized for image acquisition?

  1. Photodiode
  2. CMOS
  3. Microdensitometer
  4. None of the above

Answer: a) Photodiode

Explanation: The photodiode is a p-n junction semiconductor device that transmutes the light into an electric current.

8) What is the full form of CAT in image processing?

  1. Computer-Aided Tomography
  2. Computer-Aided Telegraphy
  3. Computerized Axial Tomography
  4. Computerized Axial Telegraphy

Answer: c) Computerized Axial Tomography

Explanation: Computerized Axial Tomography is based on image acquisition that uses sensor strips.

9) What is meant by the section of the real plane that the image coordinates have spanned?

  1. Coordinate Axis
  2. Plane of Symmetry
  3. Spatial Domain
  4. None of the above

Answer: c) Spatial Domain

Explanation: Spatial Domain refers to the section of the real plane that has been spanned by the coordinates of an image, where x and y coordinates are called Spatial coordinates.

10) Which of the following is the effect of using an inadequate amount of intensity levels in a digital image’s smooth areas?

  1. Contouring
  2. Interpolation
  3. Gaussian smooth
  4. False Contouring

Answer: d) False Contouring

Explanation: False contouring is caused when the grey-level resolution of a digital image gets decreased.

11) What is the name of the process in which the known data is utilized to evaluate the value at an unknown location?

  1. Interpolation
  2. Acquisition
  3. Pixelation
  4. None of the above

Answer: a) Interpolation

Explanation: Interpolation is a process that is employed in image resampling models for assessing unfamiliar locations.

12) Which of the following is not a correct example of Image Multiplication?

  1. Masking
  2. Shading Correction
  3. Pixelation
  4. Region of Interest Operations

Answer: c) Pixelation

Explanation: Pixelation deals with the amplification of pixels.

13) Name the procedure in which individual pixel values of the digital image get altered.

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

Answer: d) Single Pixel Operation

Explanation: It is expressed as a transformation function T of the form s=T(z), where z is the intensity.

14) Which of the following possess maximum frequency?

  1. Gamma Rays
  2. UV Rays
  3. Microwaves
  4. Radio waves

Answer: a) Gamma Rays

Explanation: Gamma rays are comprised of high-energy photons, which means gamma rays have the highest EM radiations. In the electromagnetic spectrum, “Gamma ray” is an arbitrary technology that encompasses a frequency above 300 EHz, 1 pm wavelength, and energy of 1.24 MeV.

15) Which of the following color possess the longest wavelength in the visible spectrum?

  1. Yellow
  2. Red
  3. Blue
  4. Violet

Answer: b) Red

Explanation: In the visible spectrum, red has the longest wavelength. The visible colors are ranged from shortest to longest wavelength, i.e., Violet, Blue, Green, Yellow, Orange, and Red.

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