Unsharp Masking MCQ [Free PDF] - Objective Question Answer for Unsharp Masking Quiz

16. Which of the following fact is true for an image?

A. An image is the addition of illumination and reflectance component
B. An image is the subtraction of illumination component from reflectance component
C. An image is the subtraction of the reflectance component from the illumination component
D. An image is the multiplication of illumination and reflectance component

Answer: D

An image is expressed as the multiplication of illumination and reflectance components.

17. If an image is expressed as the multiplication of illumination and reflectance component i.e. f(x, y)= I (x, y) * r(x, y), then Validate the statement “We can directly use the equation f(x, y)= i(x, y) * r(x, y) to operate separately on the frequency component of illumination and reflectance”.

A. True
B. False

Answer: B

For an image is expressed as the multiplication of illumination and reflectance component i.e. f(x, y)= i(x, y) * r(x, y), the equation can’t be used directly to operate separately on the frequency component of illumination and reflectance because the Fourier transform of the product of two functions is not separable.

18. In Homomorphic filtering which of the following operations is used to convert input image to discrete Fourier transformed function?

A. Logarithmic operation
B. Exponential operation
C. Negative transformation
D. None of the mentioned

Answer: A

For an image is expressed as the multiplication of illumination and reflectance component i.e. f(x, y) = i(x, y) * r(x, y), the equation can’t be used directly to operate separately on the frequency component of illumination and reflectance because the Fourier transform of the product of two function is not separable. So, the logarithmic operation is used.I{z(x,y)}=I{ln⁡(f(x,y)) }=I{ln⁡(i(x,y)) }+I{ln⁡(r(x,y))}.

19. A class of system that achieves the separation of illumination and reflectance component of an image is termed as __________

A. Base class system
B. Homomorphic system
C. Base separation system
D. All of the mentioned

Answer: B

A homomorphic system is a class of systems that achieves the separation of illumination and reflectance components of an image.

20. Which of the following image component is characterized by a slow spatial variation?

A. Illumination component
B. Reflectance component
C. All of the mentioned
D. None of the mentioned

Answer: A

The illumination component of an image is characterized by a slow spatial variation.

21. Which of the following image component varies abruptly, particularly at the junction of dissimilar objects?

A. Illumination component
B. Reflectance component
C. All of the mentioned
D. None of the mentioned

Answer: B

The reflectance component of an image varies abruptly, particularly at the junction of dissimilar objects.

22. The reflectance component of an image varies abruptly, particularly at the junction of dissimilar objects. The characteristic lead to associate illumination with __________

A. The low frequency of Fourier transform of the logarithm of the image
B. The high frequency of Fourier transform of the logarithm of the image
C. All of the mentioned
D. None of the mentioned

Answer: B

The reflectance component of an image varies abruptly, so, is associated with the high frequency of Fourier transform of the logarithm of the image.

23. The illumination component of an image is characterized by a slow spatial variation. The characteristic lead to associate illumination with __________

A. The low frequency of Fourier transform of the logarithm of the image
B. The high frequency of Fourier transform of the logarithm of the image
C. All of the mentioned
D. None of the mentioned

Answer: A

The illumination component of an image is characterized by a slow spatial variation, so, is associated with the low frequency of Fourier transform of the logarithm of the image.

24. If the contribution made by the illumination component of the image is decreased and the contribution of the reflectance component is amplified, what will be the net result?

A. dynamic range compression
B. Contrast enhancement
C. All of the mentioned
D. None of the mentioned

Answer: C

The illumination component of an image is characterized by a slow spatial variation and the reflectance component of an image varies abruptly, particularly at the junction of dissimilar objects, so, if the contribution made by the illumination component of the image is decreased and the contribution of reflectance component is amplified then there is simultaneous dynamic range compression and contrast stretching.

25. How is negative of an image obtained with intensity levels [0,L-1] with “r” and “s” being pixel values?

A. s = L – 1 + r
B. s = L – 1 – r
C. s = L + 1 + r
D. s = L + 1 + r

Answer: B

The negative is obtained using s = L – 1 + r.

26. The general form of log transformations is ____________________

A. s = c.log(1 + r)
B. s = c+log(1 + r)
C. s = c.log(1 – r)
D. s = c-log(1 – r)

Answer: A

s = c.log(1 + r) is the log transformation.

27. Power-law transformations has the basic form of ________________ where c and ∆ are constants.

A. s = c + r^∆
B. s = c – r^∆
C. s = c * r^∆
D. s = c / r.∆

Answer: C

s = c * r^∆ is called the Power-law transformation.

28. For what value of the output must the Power-law transformation account for offset?

A. No offset is needed
B. All values
C. One
D. Zero

Answer: D

When the output is Zero, an offset is necessary.

29. What is Gamma Correction?

A. A Power-law response phenomenon
B. Inverted Intensity curve
C. Light brightness variation
D. None of the Mentioned

Answer: A

The exponent in Power-law is called gamma and the process used to correct the response of Power-law transformation is called Gamma Correction.

30. Which process expands the range of intensity levels in an image so that it spans the full intensity range of the display?

A. Shading correction
B. Contrast sketching
C. Gamma correction
D. None of the Mentioned

Answer: B

Contrast sketching is the process used to expand intensity levels in an image.

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