Histogram Statistics Use for Image Enhancement MCQ [Free PDF] - Objective Question Answer for Histogram Statistics Use for Image Enhancement Quiz

11. For a local enhancement using mean and variance, there is one condition: σs(x, y) ≤ k2DG, where, MDG is global standard deviation, k2 a positive constant, and σs(x, y) a measure of contrast at point (x, y). Then, which fact is true for k2 if its value is greater than 1.0?

A. Enhancement is being done in light areas
B. Enhancement is being done in dark areas
C. Enhancement is being done independently of the value of k0
D. None of the mentioned

Answer: A

In the condition σs(x, y) ≤ k2DG, k0 is a positive constant that helps in enhancing light areas if the value is greater than 1.0 and dark areas if the value is less than 1.0.

12. What is the standard deviation value for the constant area?
A. 0
B. 1
C. -1
D. None of the mentioned

Answer: A

Standard deviation is given by: that results in 0 for constant areas.

13. For a local enhancement using mean and variance, what happens if the lowest value of contrast is not restricted as per the willingness to accept of value?

A. There wouldn’t be any enhancement
B. Enhancement will occur for areas with a standard deviation value > 1
C. Enhancement of the constant areas will also be the part of the procedure
D. Enhancement will occur for areas with standard deviation values> 0 and < 1

Answer: C

If the lowest value of contrast is not restricted as per the willingness to accept of value, the Enhancement of the constant areas will also be part of the procedure, since a constant area has a standard deviation value of e 0.

14. Logic operations between two or more images are performed on a pixel-by-pixel basis, except for one that is performed on a single image. Which one is that?

A. AND
B. OR
C. NOT
D. None of the mentioned

Answer: C

Although all the Arithmetic/Logic operations between two or more images are performed on a pixel-by-pixel basis, except for NOT that is performed on a single image.

15. Which of the following logical operator(s) is/are functionally complete?

A. AND
B. OR
C. NOT
D. All of the mentioned

Answer: D

All the three logical operators given are functionally complete because all other logical operators can be implemented using these three.

16. While implementing logic operation on gray-scale images, the processing of pixel values is done as __________

A. String of integer numbers
B. String of floating numbers
C. String of binary numbers
D. None of the mentioned

Answer: C

Logic operations on gray-scale images are done by the processing of pixel values as strings of binary numbers.

17. What is the equivalent for a black, 8-bit pixel to be processed under logic operation on a grayscale image?

A. A string: 00000000
B. A string: 11111111
C. A string: 10000000
D. A string: 01111111

Answer: A

Logic operations on gray-scale images are done by the processing of pixel values as a string of binary numbers, so, a black, 8-bit pixel is processed as a string of eight 0’s.

18. Which of the following operation(s) is/are equivalent to negative transformation?

A. AND
B. OR
C. NOT
D. All of the mentioned

Answer: C

Applying the NOT operator on a black, 8-bit pixel gives a white, 8-bit pixel, so, is equivalent to negative transformation.

19. Which of the following operations are used for masking?

A. AND, OR
B. AND, NOT
C. NOT, OR
D. All of the mentioned

Answer: C

AND, OR operators are used for masking, while NOT works as negative transformation.

20. Two images having one-pixel gray values 01010100 and 00000101 at the same location, are operated against AND operator. What would be the resultant pixel gray value at that location in the enhanced image?

A. 10100100
B. 11111011
C. 00000100
D. 01010101

Answer: C

For AND operation results in 1 only for 1AND 1, else 0. All the bits of the given gray value are operated similarly resulting in 00000100.

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