Deck 3: Digital Image Processing

Question 1

The output digital image must first be converted into an analog signal.

Answer 1

True

Question 2

The process of dividing a picture into small regions called pixels is referred to as:

A)sampling
B)quantization
C)analog-to-digital conversion
D)scanning

Answer 2

scanning

Question 3

Digital image processing can be defined as "subjecting numerical representations of objects to a series of operations to obtain a desired result."

Answer 3

True

Question 4

A 10* 10 matrix consists of ______ pixels.

A)10
B)20
C)100
D)120

Question 5

Visible images include all of the following except:

A)paintings
B)mathematical images
C)photographs
D)drawings

Question 6

All images displayed for viewing by humans are in the spatial frequency domain.

Question 7

Nonvisible physical images include all of the following except:

A)temperature
B)pressure
C)elevation maps
D)holograms

Question 8

The sine wave is an example of an analog signal.

Question 9

A technique of filtering in the spatial domain rather than in the frequency domain is convolution.

Question 10

A digital image is a discrete function.

Question 11

The contraction for "picture element" is:

A)pixel
B)voxel
C)matrix
D)address

Question 12

A digital image:

A)is a continuous image
B)is a numerical representation of an object
C)cannot be processed by a digital computer
D)is a nonvisible physical image

Question 13

Aliasing results in an artifact that appears as a moiré pattern in the image.

Question 14

Digitization consists of four steps: scanning, sampling, quantization, and digital-to-analog conversion.

Question 15

Digital image processing techniques have been applied successfully in not only the space program but also in medical imaging.

Question 16

The Fourier transform is used to transform one image domain into another image domain.

Question 17

The origin of digital image processing stems from:

A)the space program
B)General Electric
C)Hounsfield
D)the Mayo Clinic

Question 18

A radiograph is an example of an analog image.

Question 19

In which of the following are numerical representations of objects subjected to a series of operations to produce a desired result?

A)digital image processing
B)pattern recognition
C)analog-to-digital conversion
D)digital-to-analog conversion

Question 20

Which of the following represents the logical order in digitizing an image?

A)scanning, sampling, and quantization
B)sampling, scanning, and quantization
C)quantization, scanning, and sampling
D)sampling, quantization, and scanning

Question 21

Which of the following assigns integers to the brightness values measured by the photomultiplier tube?

A)scanning
B)sampling
C)quantization
D)analog-to-digital conversion

Question 22

An example of a local operation that concerns brightness information on an image is called:

A)area processes
B)spatial frequency filtering
C)convolution
D)histogram modification

Question 23

The least complicated and most frequently used image processing technique is the:

A)point operation
B)local operation
C)global operation
D)geometric operation

Question 24

In which of the following is the brightness level of each pixel in a picture measured by a photomultiplier tube?

A)scanning
B)sampling
C)quantization
D)digital-to-analog conversion

Question 25

Gray-level mapping is an example of a:

A)local operation
B)global operation
C)geometric operation
D)point processing technique

Question 26

Which type of artifact will appear on a digital image as a result of poor sampling of the analog signal?

A)beam hardening
B)partial volume
C)aliasing
D)poor sampling does not create artifacts

Question 27

An increase of matrix size (with no change in field of view) will ____________ detail.

A)increase
B)decrease
C)not change
D)have no effect on

Question 28

Pixels in a digital image representing information contained in a volume of tissue in the patient are referred to as a:

A)pixel
B)voxel
C)bit depth
D)matrix

Question 29

Which of the following converts an analog signal (voltage) into digital data (numbers)?

A)an analog switch
B)an analog-to-digital converter
C)a quantizer
D)a digital-to-analog converter

Question 30

A histogram in digital image processing is:

A)a plot of the number of pixels as a function of the number of gray levels
B)a local operation
C)a spatial frequency filter
D)a windowing level

Question 31

The systematic method of collecting data from the patient is called:

A)image processing
B)data acquisition
C)image display
D)image communication

Question 32

The total number of gray levels is called:

A)a matrix
B)the gray scale
C)an electronic signal
D)bit depth

Question 33

In which of the following is the quality improved of a digital image that has distortions or degradations?

A)image enhancement
B)image analysis
C)image restoration
D)pattern recognition

Question 34

Which of the following is the final step in digitizing an image?

A)sampling
B)analog-to-digital conversion
C)quantization
D)scanning

Question 35

Which of the following reduces the amount of data that makes up the image?

A)image enhancement
B)image restoration
C)image analysis
D)image compression

Question 36

Which type of image processing technique is intended to modify the spatial position of the pixels in an image?

A)point processing operation
B)geometric processing operation
C)local processing operation
D)global processing operation

Question 37

An 8-bit analog-to-digital converter will divide a signal into:

A)8 parts
B)8 parts.
C)64 parts
D)256 parts

Question 38

The purpose of image enhancement is:

A)to generate an image more pleasing to the observer
B)to improve the quality of images that have distortions
C)to allow measurements and statistics to be performed
D)to reduce the size of the image

Question 39

Which analog-to-digital converter (ADC) is more accurate with respect to sampling an analog signal?

A)2-bit ADC
B)4-bit ADC
C)8-bit ADC
D)16-bit ADC

Question 40

Which type(s) of image compression results in no loss of information in the compressed image data? I. lossless
II) lossy
III) reversible
IV) irreversible

A)I and II
B)III and IV
C)I and III
D)II and IV

Question 41

Please match the following digital image processing concepts for each group. All answer selections will be used just once.

This technique can result in the scaling and sizing of images

A)global operations
B)point operations
C)local operations
D)geometrical operations

Question 42

Please match the following digital image processing concepts for each group. All answer selections will be used just once.

Most frequently used image processing technique

A)global operations
B)point operations
C)local operations
D)geometrical operations

Question 43

Which image processing hardware is responsible for high-speed processing of the input digital data?

A)digitizer
B)image memory
C)internal image processor
D)host computer

Question 44

Please match the following digital image processing concepts for each group. All answer selections will be used just once.

Also called area processes or group processes

A)global operations
B)point operations
C)local operations
D)geometrical operations

Question 45

What are the components of a digital image processing system?

Question 46

What is the purpose of the host computer in a digital image processing system?

Question 47

Please match the following digital image processing concepts for each group. All answer selections will be used just once.

A common operation in this processing technique is Fourier domain processing

A)global operations
B)point operations
C)local operations
D)geometrical operations

Question 48

Explain briefly what is meant by convolution.