Sharpening Spatial Filters-2 MCQ

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

  A line

  খ

  A step

  গ

  A point

  ঘ

  None of the mentioned
• What kind of relation can be obtained between the response of first order derivative and second order derivative of an image having a transition into gray-level step from zero?
  ক

  First order derivative has a stronger response than a second order

  খ

  Second order derivative has a stronger response than a first order

  গ

  Both first and second order derivative has the same response

  ঘ

  None of the mentioned
• What kind of relation can be obtained between first order derivative and second order derivative of an image on the response obtained by encountering an isolated noise point in the image?
  ক

  First order derivative has a stronger response than a second order

  খ

  Second order derivative has a stronger response than a first order

  গ

  Both enhances the same and so the response is same for both first and second order derivative

  ঘ

  None of the mentioned
• What kind of relation can be obtained between first order derivative and second order derivative of an image having a on the basis of edge productions that shows a transition like a ramp of constant slope?
  ক

  First order derivative produces thick edge while second order produces a very fine edge

  খ

  Second order derivative produces thick edge while first order produces a very fine edge

  গ

  Both first and second order produces thick edge

  ঘ

  Both first and second order produces a very fine edge
• The derivative of digital function is defined in terms of difference. Then, which of the following defines the second order derivative ∂2 f/∂x2 = ___________ of a one-dimensional function f(x)?
  ক

  f(x+1)-f(x)

  খ

  f(x+1)+ f(x-1)-2f(x)

  গ

  All of the mentioned depending upon the time when partial derivative will be dealt along two spatial axes

  ঘ

  None of the mentioned
• The derivative of digital function is defined in terms of difference. Then, which of the following defines the first order derivative ∂f/∂x= ___________ of a one-dimensional function f(x)?
  ক

  f(x+1)-f(x)

  খ

  f(x+1)+ f(x-1)-2f(x)

  গ

  All of the mentioned depending upon the time when partial derivative will be dealt along two spatial axes

  ঘ

  None of the mentioned
• Which of the facts(s) is/are true for the second order derivative of a digital function?
  ক

  Must be zero in the flat areas

  খ

  Must be nonzero at the onset and end of a gray-level step or ramp discontinuities

  গ

  Must be zero along the ramps of constant slope

  ঘ

  All of the mentioned
• Which of the facts(s) is/are true for the first order derivative of a digital function?
  ক

  Must be nonzero in the areas of constant grey values

  খ

  Must be zero at the onset of a gray-level step or ramp discontinuities

  গ

  Must be nonzero along the gray-level ramps

  ঘ

  None of the mentioned
• Which of the following fact(s) is/are true about sharpening spatial filters using digital differentiation?
  ক

  Sharpening spatial filter response is proportional to the discontinuity of the image at the point where the derivative operation is applied

  খ

  Sharpening spatial filters enhances edges and discontinuities like noise

  গ

  Sharpening spatial filters deemphasizes areas that have slowly varying gray-level values

  ঘ

  All of the mentioned
• Sharpening is analogous to which of the following operations?
  ক

  To spatial integration

  খ

  To spatial differentiation

  গ

  All of the mentioned

  ঘ

  None of the mentioned
• The objective of sharpening spatial filters is/are to ___________
  ক

  Highlight fine detail in an image

  খ

  Enhance detail that has been blurred because of some error

  গ

  Enhance detail that has been blurred because of some natural effect of some method of image acquisition

  ঘ

  All of the mentioned