21. What is the name of the process used to correct the power-law response phenomena?

A. Beta correction

B. Alpha correction

C. Gamma correction

D. Pie correction

22. Which of the following transformation function requires much information to be specified at the time of input?

A. Log transformation

B. Power transformation

C. Piece-wise transformation

D. Linear transformation

23. In contrast to stretching, if r1=s1 and r2=s2 then which of the following is true?

A. The transformation is not a linear function that produces no changes in gray levels

B. The transformation is a linear function that produces no changes in gray levels

C. The transformation is a linear function that produces changes in gray levels

D. The transformation is not a linear function that produces changes in gray levels

24. In contrast to stretching, if r1=r2, s1=0, and s2=L-1 then which of the following is true?

A. The transformation becomes a thresholding function that creates an octal image

B. The transformation becomes an override function that creates an octal image

C. The transformation becomes a thresholding function that creates a binary image

D. The transformation becomes a thresholding function that does not create an octal image

25. In contrast to stretching, if r1≤r2 and s1≤s2 then which of the following is true?

A. The transformation function is double valued and exponentially increasing

B. The transformation function is double valued and monotonically increasing

C. The transformation function is single-valued and exponentially increasing

D. The transformation function is single-valued and monotonically increasing

26. In which type of slicing, highlighting a specific range of gray levels in an image often is desired?

A. Gray-level slicing

B. Bit-plane slicing

C. Contrast stretching

D. Byte-level slicing

27. Which of the following depicts the main functionality of the Bit-plane slicing?

A. Highlighting a specific range of gray levels in an image

B. Highlighting the contribution made to total image appearance by specific bits

C. Highlighting the contribution made to total image appearance by a specific byte

D. Highlighting the contribution made to total image appearance by specific pixels

28. Which of the following is the primary objective of sharpening an image?

A. Blurring the image

B. Highlight fine details in the image

C. Increase the brightness of the image

D. Decrease the brightness of the image

29. Image sharpening process is used in electronic printing.

A. True

B. False

30. In the spatial domain, which of the following operation is done on the pixels in sharpening the image?

A. Integration

B. Average

C. Median

D. Differentiation

31. Image differentiation enhances the edges, and discontinuities and deemphasizes the pixels with slow varying gray levels.

A. True

B. False

32. In which of the following cases, we wouldn’t worry about the behavior of the sharpening filter?

A. Flat segments

B. Step discontinuities

C. Ramp discontinuities

D. Slow varying gray values

33. Which of the following is the valid response when we apply the first derivative?

A. Non-zero at flat segments

B. Zero at the onset of gray level step

C. Zero in flat segments

D. Zero along ramps

34. Which of the following is not a valid response when we apply a second derivative?

A. Zero response at the onset of gray level step

B. Nonzero response at the onset of gray level step

C. Zero response at flat segments

D. Nonzero response along the ramps

35. If f(x,y) is an image function of two variables, then the first order derivative of a one dimensional function, f(x) is:

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

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

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

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

36. Isolated point is also called a noise point.

A. True

B. False

37. What is the thickness of the edges produced by first-order derivatives when compared to that of second-order derivatives?

A. Finer

B. Equal

C. Thicker

D. Independent

38. First-order derivative can enhance the fine detail in the image compared to that of a second-order derivative.

A. True

B. False

39. Which of the following derivatives produce a double response at step changes in gray level?

A. First-order derivative

B. Third-order derivative

C. Second-order derivative

D. First and second-order derivatives

40. The objective of sharpening spatial filters is/are to ___________

A. Highlight fine detail in an image

B. Enhance detail that has been blurred because of some error

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

D. All of the mentioned