# Basics Of Image Sampling & Quantization MCQ [Free PDF] – Objective Question Answer for Basics Of Image Sampling & Quantization Quiz

1. 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

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.

2. 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

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

3. 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

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

4. 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

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

5.  “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

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

6. 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.

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.

7. 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

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.

8. 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

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.

9. 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

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

10. Assume that an image f(x, y) is sampled so that the result has M rows and N columns. If the values of the coordinates at the origin are (x, y) = (0, 0), then the notation (0, 1) is used to signify :

A. Second sample along the first row
B. First sample along the second row
C. First sample along the first row
D. Second sample along the second row

The values of the coordinates at the origin are (x, y) = (0, 0). Then, the next coordinate values (second sample) along the first row of the image are represented as (x, y) = (0, 1).

11. The resulting image of sampling and quantization is considered a matrix of real numbers. By what name(s) the element of this matrix array is called __________

A. Image element or Picture element
B. Pixel or Pel
C. All of the mentioned
D. None of the mentioned

Sampling and Quantization of an image f(x, y) forms a matrix of real numbers and each element of this matrix array is commonly known as the Image element Picture element Pixel or Pel.

12. Let Z be the set of real integers and R the set of real numbers. The sampling process may be viewed as partitioning the x-y plane into a grid, with the center coordinates of each grid being from the Cartesian product Z2, which is a set of all ordered pairs (zi, zj), with zi and zj being integers from Z. Then, f(x, y) is said a digital image if:

A. (x, y) are integers from Z2 and f is a function that assigns a gray-level value (from Z) to each distinct pair of coordinates (x, y)

B. (x, y) are integers from R2 and f is a function that assigns a gray-level value (from R) to each distinct pair of coordinates (x, y)

C. (x, y) are integers from R2 and f is a function that assigns a gray-level value (from Z) to each distinct pair of coordinates (x, y)

D. (x, y) are integers from Z2 and f is a function that assigns a gray-level value (from R) to each distinct pair of coordinates (x, y)

In the given condition, f(x, y) is a digital image if (x, y) are integers from Z2 and f a function that assigns a gray-level value (that is, a real number from the set R) to each distinct coordinate pair (x, y).

13. Let Z be the set of real integers and R the set of real numbers. The sampling process may be viewed as partitioning the x-y plane into a grid, with the center coordinates of each grid being from the Cartesian product Z2, which is a set of all ordered pairs (zi, zj), with zi and zj being integers from Z. Then, f(x, y) is a digital image if (x, y) are integers from Z2 and f is a function that assigns a gray-level value (that is, a real number from the set R) to each distinct coordinate pair (x, y). What happens to the digital image if the gray levels also are integers?

A. The Digital image then becomes a 2-D function whose coordinates and amplitude values are integers

B. The Digital image then becomes a 1-D function whose coordinates and amplitude values are integers

C. The gray level can never be an integer

D. None of the mentioned

In Quantization Process if the gray levels also are integers the Digital image then becomes a 2-D function whose coordinates and amplitude values are integers.

14. The digitization process i.e. the digital image has M rows and N columns, requires decisions about values for M, N, and the number, L, of gray levels allowed for each pixel. The values M and N have to be:

A. M and N have to be a positive integer
B. M and N have to be a negative integer
C. M has to be negative and N has to be a positive integer
D. M has to be positive and N has to be a negative integer

The digitization process i.e. the digital image has M rows and N columns requires decisions about values for M, N, and the number, L, of max gray level. There are no requirements on M and N, other than that M and N have to be a positive integer.

15. The digitization process i.e. the digital image has M rows and N columns, requires decisions about values for M, N, and the number, L, of max gray levels. There are no requirements on M and N, other than that M and N have to be a positive integer. However, the number of gray levels typically is

A. An integer power of 2 i.e. L = 2k
B. A Real power of 2 i.e. L = 2k
C. Two times the integer value i.e. L = 2k
D. None of the mentioned