41. Which of the following transformations is particularly well suited for enhancing an image with white and gray detail embedded in dark regions of the image, especially when there is more black area in the image.
A. Log transformations
B. Power-law transformations
C. Negative transformations
D. None of the mentioned
42. Which of the following transformations expands the value of dark pixels while the higher-level values are being compressed?
A. Log transformations
B. Inverse-log transformations
C. Negative transformations
D. None of the mentioned
43. Although power-law transformations are considered more versatile than log transformations for compressing gray levels in an image, then, how are log transformations advantageous over power-law transformations?
A. The log transformation compresses the dynamic range of images
B. The log transformations reverse the intensity levels in the images
C. All of Mentioned
D. None of the mentioned
44. A typical Fourier Spectrum with spectrum values ranging from 0 to 106, which of the following transformation is better to apply.
A. Log transformations
B. Power-law transformations
C. Negative transformations
D. None of the mentioned
45. The power-law transformation is given as s = crᵞ, c and ᵞ are positive constants, and r is the gray level of the image before processing and s after processing. Then, for what value of c and ᵞ does power-law transformation becomes identity transformation?
A. c = 1 and ᵞ < 1
B. c = 1 and ᵞ > 1
C. c = -1 and ᵞ = 0
D. c = ᵞ = 1
46. What is gamma correction?
A. A process to remove power-law transformation response phenomena
B. A process to remove log transformation response phenomena
C. A process to correct log transformation response phenomena
D. A process to correct power-law transformation response phenomena
47. Which of the following transformation is used in cathode ray tube (CRT) devices?
A. Log transformations
B. Power-law transformations
C. Negative transformations
D. None of the mentioned
48. Log transformation is generally used in which of the following device(s)?
A. Cathode ray tube
B. Scanners and printers
C. All of Mentioned
D. None of the mentioned
49. The power-law transformation is given as s = crᵞ, c and ᵞ are positive constants, and r is the gray level of the image before processing and s after processing. What happens if we increase the gamma value from 0.3 to 0.7?
A. The contrast increases and the detail increases
B. The contrast decreases and the detail decreases
C. The contrast increases and the detail decreases
D. The contrast decreases and the detail increases
50. If h(rk) = nk, rk the kth gray level and nk total pixels with gray level rk, is a histogram in the gray level range [0, L – 1]. Then how can we normalize a histogram?
A. If each value of the histogram is added by the total number of pixels in the image, say n, p(RK)=nk+n
B. If each value of the histogram is subtracted by the total number of pixels in the image, say n, p(rk)=nk-n
C. If each value of the histogram is multiplied by the total number of pixels in the image, say n, p(rk)=nk * n
D. If each value of the histogram is divided by the total number of pixels in the image, say n, p(rk)=nk / n