# Image Sampling MCQ [Free PDF] – Objective Question Answer for Image Sampling Quiz

16. _____________ is the effect caused by the use of an insufficient number of intensity levels in smooth areas of a digital image.

A. Gaussian smooth
B. Contouring
C. False Contouring
D. Interpolation

False Contouring is the effect caused by the use of an insufficient number of intensity levels in smooth areas of a digital image. It is called so because the ridges resemble the contours of a map.

17. The process of using known data to estimate values at unknown locations is called

A. Acquisition
B. Interpolation
C. Pixelation
D. None of the Mentioned

Interpolation is the process used to estimate unknown locations. It is applied in all image resampling methods.

18. Which of the following is NOT an application of Image Multiplication?

C. Pixelation
D. Region of Interest operations

Pixelation is NOT an application of Image Multiplication. Because Pixelation deals with the enlargement of pixels.

19. The procedure done on a digital image to alter the values of its individual pixels is

A. Neighbourhood Operations
B. Image Registration
C. Geometric Spatial Transformation
D. Single Pixel Operation

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

20. In Geometric Spatial Transformation, points whose locations are known precisely in input and reference images.

A. Tie points
B. Réseau points
C. Known points
D. Key-points

Tie points, also called Control points are points whose locations are known precisely in input and reference images.

21. Of the following, _________ has the maximum frequency.

A. UV Rays
B. Gamma Rays
C. Microwaves

Gamma Rays come first in the electromagnetic spectrum sorted in the decreasing order of frequency.

22. In the Visible spectrum the ______ color has the maximum wavelength.

A. Violet
B. Blue
C. Red
D. Yellow

Red is towards the right in the electromagnetic spectrum sorted in the increasing order of wavelength.

23. Wavelength and frequency are related as : (c = speed of light)

A. c = wavelength / frequency
B. frequency = wavelength / c
C. wavelength = c * frequency
D. c = wavelength * frequency

It is usually written as wavelength = c / frequency.

24. Electromagnetic waves can be visualized as a

A. sine wave
B. cosine wave
C. tangential wave
D. None of the mentioned

Electromagnetic waves are visualized as sinusoidal waves.

A. lumens
B. watts
C. Armstrong
D. hertz

Radiance is the total amount of energy that flows from the light source and is measured in Watts.

26. Which of the following is used for chest and dental scans?

A. Hard X-Rays
B. Soft X-Rays
D. Infrared Rays

Soft X-Rays (low energy) are used for dental and chest scans.

27. Which of the following is impractical to measure?

A. Frequency
C. Luminance
D. Brightness

Brightness is the subjective descriptor of light perception that is impossible to measure.

28. Massless particle containing a certain amount of energy is called

A. Photon
B. Shell
C. Electron
D. None of the mentioned

A massless particle containing a certain amount of energy is called a photon. Each bundle of massless energy is called a Photon.

29. What do you mean by achromatic light?

A. Chromatic light
B. Monochromatic light
C. Infrared light
D. Invisible light

Achromatic light is also called monochromatic light. (Light void of color)

30. Which of the following embodies the achromatic notion of intensity?

A. Luminance
B. Brightness
C. Frequency

Brightness embodies the achromatic notion of intensity and is a key factor in describing the color sensation.

31. How is array operation carried out involving one or more images?

A. array by array
B. pixel by pixel
C. column by column
D. row by row

Any array operation is carried out on a pixel-by-pixel basis.

32. The property indicating that the output of a linear operation due to the sum of two inputs is the same as performing the operation on the inputs individually and then summing the results is called ___________

B. heterogeneity
C. homogeneity
D. None of the Mentioned

The property indicating that the output of a linear operation due to the sum of two inputs is the same as performing the operation on the inputs individually and then summing the results is called additivity.

33. The property indicating that the output of a linear operation to a constant time as input is the same as the output of operation due to original input multiplied by that constant is called _________

B. heterogeneity
C. homogeneity
D. None of the Mentioned

The property indicating that the output of a linear operation to a constant time as input is the same as the output of operation due to original input multiplied by that constant is called homogeneity.

34. Enhancement of differences between images is based on the principle of ____________

B. Homogeneity
C. Subtraction
D. None of the Mentioned

A frequent application of image subtraction is in the enhancement of differences between images.

35. A commercial use of Image Subtraction is ___________

B. MRI scan
C. CT scan
D. None of the Mentioned

Mask mode radiography is an important medical imaging area based on Image Subtraction.

36. Region of Interest (ROI) operations is commonly called as ___________

C. Dilation
D. None of the Mentioned

A common use of image multiplication is Masking, also called ROI operation.

37. If every element of a set A is also an element of a set B, then A is said to be a _________ of set B.

A. Disjoint set
B. Union
C. Subset
D. Complement set