11. 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
12. 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
13. 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
14. Log transformation is generally used in which of the following device(s)?
A. Cathode ray tube
B. Scanners and printers
C. All of the mentioned
D. None of the mentioned
15. 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
16. 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
17. What is the sum of all components of a normalized histogram?
A. 1
B. -1
C. 0
D. None of the mentioned
18. A low contrast image will have what kind of histogram when, the histogram, h(rk) = nk, rk the kth gray level and nk total pixels with gray level rk, is plotted nk versus rk?
A. The histogram that is concentrated on the dark side of the grayscale
B. The histogram whose components are biased toward the high side of the grayscale
C. The histogram that is narrow and centered toward the middle of the grayscale
D. The histogram that covers a wide range of grayscale and the distribution of pixels is approximately uniform
19. A bright image will have what kind of histogram, when the histogram, h(rk) = nk, rk the kth gray level and nk total pixels with gray level rk, is plotted nk versus rk?
A. The histogram that is concentrated on the dark side of the gray scale
B. The histogram whose components are biased toward the high side of the gray scale
C. The histogram that is narrow and centered toward the middle of the gray scale
D. The histogram that covers a wide range of gray scales and the distribution of pixels is approximately uniform
20. A high contrast image and a dark image will have what kind of histogram respectively, when the histogram, h(rk) = nk, rk the kth gray level and nk total pixels with gray level rk, is plotted nk versus rk?
The histogram is concentrated on the dark side of the gray scale.
The histogram whose components are biased toward the high side of the gray scale.
The histogram is narrow and centered toward the middle of the grayscale.
The histogram covers a wide range of grayscales and the distribution of pixels is approximately uniform.
A. I) And II) respectively
B. III) And II) respectively
C. II) And IV) respectively
D. IV) And I) respectively