42. Sharpening is analogous to which of the following operations?

A. To spatial integration

B. To spatial differentiation

C. All of the mentioned

D. None of the mentioned

43. Which of the following fact(s) is/are true about sharpening spatial filters using digital differentiation?

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

B. Sharpening spatial filters enhances edges and discontinuities like noise

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

D. All of the mentioned

44. Which of the facts(s) is/are true for the first-order derivative of a digital function?

A. Must be nonzero in the areas of constant grey values

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

C. Must be nonzero along the gray-level ramps

D. None of the mentioned

45. Which of the facts(s) is/are true for the second-order derivative of a digital function?

A. Must be zero in the flat areas

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

C. Must be zero along the ramps of constant slope

D. All of the mentioned

46. The derivative of a 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)?

A. f(x+1)-f(x)

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

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

D. None of the mentioned

47. The derivative of a 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)?

A. f(x+1)-f(x)

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

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

D. None of the mentioned

48. What kind of relationship can be obtained between the first-order derivative and second-order derivative of an image having a based on edge productions that show a transition like a ramp of the constant slope?

A. First-order derivative produces a thick edge while second-order produces a very fine edge

B. Second-order derivative produces a thick edge while first-order produces a very fine edge

C. Both first and second-order produce a thick edge

D. Both first and second-order produce a very fine edge

49. 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

50. 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

51. 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

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

A. Pixel density

B. Composure

C. Intensity

D. Brightness

52. How can Sharpening be achieved?

A. Pixel averaging

B. Slicing

C. Correlation

D. None of the mentioned

53. What does Image Differentiation enhance?

A. Edges

B. Pixel Density

C. Contours

D. None of the mentioned

54. What does Image Differentiation de-emphasize?

A. Pixel Density

B. Contours

C. Areas with slowly varying intensities

D. None of the mentioned

55. 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

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

A. Gaussian

B. Laplacian

C. Canny

D. None of the mentioned

57. 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

58. 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

59. Where do you find frequent use of Gradient?

A. Industrial inspection

B. MRI Imaging

C. PET Scan

D. None of the mentioned

60. 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