Sharpening Spatial Filters MCQ [Free PDF] - Objective Question Answer for Sharpening Spatial Filters Quiz

21. What kind of relationship can be obtained between the first-order derivative and second-order derivative of an image on the response obtained by encountering an isolated noise point in the image?

A. First order derivative has a stronger response than a second order
B. Second order derivative has a stronger response than a first order
C. Both enhance the same and so the response is the same for both first and second-order derivative
D. None of the mentioned

Answer: B

This is because a second-order derivative is more aggressive toward enhancing sharp changes than first order.

22. What kind of relationship can be obtained between the response of the first-order derivative and second-order derivative of an image having a transition into a gray-level step from zero?

A. First order derivative has a stronger response than a second order
B. Second order derivative has a stronger response than a first order
C. Both first and second-order derivative has the same response
D. None of the mentioned

Answer: C

This is because a first-order derivative has a stronger response to a gray-level step than second order, but, the response becomes the same if the transition into the gray-level step is from zero.

23. If in an image there exist a similar change in gray-level values in the image, which of the following shows a stronger response using a second-order derivative operator for sharpening?

A. A-line
B. A step
C. A point
D. None of the mentioned

Answer: C

second-order derivative shows a stronger response to a line than a step and a point than a line if there are similar changes in gray-level values in an image.

24. The principle objective of Sharpening, to highlight transitions is ________

A. Pixel density
B. Composure
C. Intensity
D. Brightness

Answer: C

The principal objective of Sharpening, to highlight transitions is Intensity.

25. How can Sharpening be achieved?

A. Pixel averaging
B. Slicing
C. Correlation
D. None of the mentioned

Answer: D

Sharpening is achieved using Spatial Differentiation.

26. What does Image Differentiation enhance?

A. Edges
B. Pixel Density
C. Contours
D. None of the mentioned

Answer: A

Image Differentiation enhances Edges and other discontinuities.

27. What does Image Differentiation de-emphasize?

A. Pixel Density
B. Contours
C. Areas with slowly varying intensities
D. None of the mentioned

Answer: C

Image Differentiation de-emphasizes areas with slowly varying intensities.

28. The requirements of the First Derivative of a digital function:

A. Must be zero in areas of constant intensity
B. Must be non-zero at the onset of an intensity step
C. Must be non-zero along ramps
D. All of the Mentioned

Answer: D

The requirements of the First Derivative of a digital function:

A. Must be zero in areas of constant intensity
B. Must be non-zero at the onset of an intensity step
C. Must be non-zero along ramps

All three conditions must be satisfied.

29. What is the Second Derivative of Image Sharpening called?

A. Gaussian
B. Laplacian
C. Canny
D. None of the mentioned

Answer: B

The Second Derivative of Image Sharpening is also called Laplacian.

30. The ability that rotates the image and applies the filter gives the same result, as applying the filter to the image first, and then rotating it, is called _____________

A. Isotropic filtering
B. Laplacian
C. Rotation Invariant
D. None of the mentioned

Answer: C

It is called Rotation Invariant, although the process used is Isotropic filtering.

31. For a function f(x,y), the gradient of ‘f’ at coordinates (x,y) is defined as a ___________

A. 3-D row vector
B. 3-D column vector
C. 2-D row vector
D. 2-D column vector

Answer: D

For a function f(x,y), the gradient of ‘f’ at coordinates (x,y) is defined as a 2-D column vector.

32. Where do you find frequent use of Gradient?

A. Industrial inspection
B. MRI Imaging
C. PET Scan
D. None of the mentioned

Answer: A

The gradient is used in Industrial inspection, to aid humans, in the detection of defects.

33. Which of the following occurs in Unsharp Masking?

A. Blurring original image
B. Adding a mask to the original image
C. Subtracting blurred images from the original
D. All of the mentioned

Answer: D

In Unsharp Masking, all of the above occurs in the order: Blurring, Subtracting the blurred image and then Adding the mask.

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