Displays and Image Processing Part 1 Flashcards
Week 1
What is the meaning of the word “bi-stable”?
images composed of only 2 shades, black and white
What does gray scale mean?
displays multiple levels of brightness
What does contrast determine?
the range of brilliance within the displayed image.
Bi-stable images in which only white and black appear are what, high or low contrast?
High contrast
Brightness determines what?
The brilliance of the displayed image.
What knob controls brightness?
overall Gain
What does a scan converter do?
It changes the format of data. It converts the information from the spoke format ( analog) into the video (digital) format.
Analog numbers are what?
Real world numbers, 1,2,3,…..
Digital numbers are associated with what?
1’s and 0’s.
Analog numbers….
- real world numbers
- unlimited # of choices
- continuous values
Digital numbers…..
- computer world
- limited choices
- discrete values
Digital scan converters change what?
sound into electrical information then into an image on a flat screen.
Analog scan converter has excellent what?
Spatial resolution
Spatial resolution means what?
image detail
What type of scan converter made gray scale possible?
Analog scan converter
What are some limitations for an Analog Scan converter?
- Image fade
- Image flicker
- Instability
- Deterioration
What are some advantages of a digital scan converter?
- uniformity
- stability
- durability
- speed
- Accuracy
What is a pixel?
A pixel is the smallest element of a digital image.
Pixel density has to do with what?
pixels per square inch
High pixel density is achieved with what?
smaller pixels
Spatial resolution improves with higher or lower pixel density?
Higher pixel density.