1. Intro to digital image processing

Question 1

In context of function, how can an imagebe defined?

Answer 1

2-dimensional function f(x,y)

Question 2

From which 2 principle applications does digital image processing stem from?

Answer 2

1. Improvement of pictoral information for human interpretation
2. Processing image data for storage, transmission, and representation.

Question 3

What is the main purpose of digital image processing in radiography?

Answer 3

To produce a visible image from invisible radiation.

Question 4

What are the four properties of an ideal imaging system?

Answer 4

1. High spatial resolution
2. High contrast
3. High SNR
4. High frame rate

Question 5

What is Spatial Resolution?

Answer 5

The smallest separation between two objects that can be visibly resolved as two separate objects

Question 6

What are the units of spatial resolution

Answer 6

Line pairs per mm
Pixels per cm^2
Pixels per line
Dots per inch

Question 7

What does high contrast mean?

Answer 7

There is high separation between dark and light

Question 8

What is contrast?

Answer 8

The separation between dark and light areas of the image

Question 9

What is Signal-to-noise ratio?

Answer 9

Ratio of the average signal to the standard deviation of the background

Question 10

What unit is SNR measured in?

Answer 10

Decibels

Question 11

What is frame rate?

Answer 11

The time required to acquire a single frame of an image.