Light and Electromagnetic Spectrum MCQ [Free PDF] - Objective Question Answer for Light and Electromagnetic Spectrum Quiz

16. Region of Interest (ROI) operations is commonly called as ___________

A. Shading correction
B. Masking
C. Dilation
D. None of the Mentioned

Answer: B

A common use of image multiplication is Masking, also called ROI operation.

17. If every element of a set A is also an element of a set B, then A is said to be a _________ of set B.

A. Disjoint set
B. Union
C. Subset
D. Complement set

Answer: C

If every element of a set A is also an element of a set B, then A is said to be a subset of set B.

18. Consider two regions A and B composed of foreground pixels. The ________ of these two sets is the set of elements belonging to set A or set B or both.

A. OR
B. AND
C. NOT
D. XOR

Answer: A

Consider two regions A and B composed of foreground pixels. The OR of these two sets is the set of elements belonging to set A or set B or both.

19. Imaging systems having physical artifacts embedded in the imaging sensors produce a set of points called __________

A. Tie Points
B. Control Points
C. Reseau Marks
D. None of the Mentioned

Answer: C

Imaging systems having physical artifacts embedded in the imaging sensors produce a set of points called “known” points or “Reseau marks”.

20. Image processing approaches operating directly on pixels of input image work directly in ____________

A. Transform domain
B. Spatial domain
C. Inverse transformation
D. None of the Mentioned

Answer: B

Operations directly on pixels of input image work directly in the Spatial Domain.

21. To convert a continuous sensed data into Digital form, which of the following is required?

A. Sampling
B. Quantization
C. Both Sampling and Quantization
D. Neither Sampling nor Quantization

Answer: C

The output of most sensors is a continuous waveform and the amplitude and spatial behavior of such waveform are related to the physical phenomenon being sensed.

22. To convert a continuous image f(x, y) to digital form, we have to sample the function in __________

A. Coordinates
B. Amplitude`
C. All of the mentioned
D. None of the mentioned

Answer: C

An image may be continuous in the x- and y-coordinates or amplitude, or both.

23. For a continuous image f(x, y), how could be Sampling defined?

A. Digitizing the coordinate values
B. Digitizing the amplitude values
C. All of the mentioned
D. None of the mentioned

Answer: A

Sampling is the method of digitizing the coordinate values of the image.

24. For a continuous image f(x, y), Quantization is defined as

A. Digitizing the coordinate values
B. Digitizing the amplitude values
C. All of the mentioned
D. None of the mentioned

Answer: B

Sampling is the method of digitizing the amplitude values of the image.

25. “For a given image in one-dimension given by function f(x, y), to sample the function we take equally spaced samples, superimposed on the function, along a horizontal line. However, the sample values still span (vertically) a continuous range of gray-level values. So, to convert the given function into a digital function, the gray-level values must be divided into various discrete levels.”

A. True
B. False

Answer: A

The digital function requires both sampling and quantization of the one-dimensional image function.

26. How is sampling been done when an image is generated by a single sensing element combined with mechanical motion?

A. The number of sensors in the strip defines the sampling limitations in one direction and Mechanical motion in the other direction.
B. The number of sensors in the sensing array establishes the limits of sampling in both directions.
C. The number of mechanical increments when the sensor is activated to collect data.
D. None of the mentioned.

Answer: C

When an image is generated by a single sensing element along with mechanical motion, the output data is quantized by dividing the gray-level scale into many discrete levels. However, sampling is done by selecting the number of individual mechanical increments recorded at which we activate the sensor to collect data.

27. How does sampling gets accomplished with a sensing strip being used for image acquisition?

A. The number of sensors in the strip establishes the sampling limitations in one image direction and Mechanical motion in the other direction
B. The number of sensors in the sensing array establishes the limits of sampling in both directions
C. The number of mechanical increments when the sensor is activated to collect data
D. None of the mentioned

Answer: A

When a sensing strip is used the number of sensors in the strip defines the sampling limitations in one direction and mechanical motion in the other direction.

28. How is sampling accomplished when a sensing array is used for image acquisition?

A. The number of sensors in the strip establishes the sampling limitations in one image direction and Mechanical motion in the other direction
B. The number of sensors in the sensing array defines the limits of sampling in both directions
C. The number of mechanical increments at which we activate the sensor to collect data
D. None of the mentioned

Answer: B

When we use a sensing array for image acquisition, there is no motion and so, only the number of sensors in the array defines the limits of sampling in both directions and the output of the sensor is quantized by dividing the gray-level scale into many discrete levels.

29. The quality of a digital image is well determined by ___________

A. The number of samples
B. The discrete gray levels
C. All of the mentioned
D. None of the mentioned

Answer: C

The quality of a digital image is determined mostly by the number of samples and discrete gray levels used in sampling and quantization.

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