Ch 1: Understanding Scanners and Barcodes Flashcards
(16 cards)
What is a scanner?
A light - sensing device that detects and captures text and images
How do scanners work?
They shine a bright light on the page and measure the amount of light that bounces back from each spot.
The strength of the captured light is digitized or converted to digits and the digitized information is sent to the computer to record color.
Which colors of light do scanners measure?
Scanners measure the amounts of red, green and blue individually.
What is a Charged Coupled Device (CCD)?
The sensor that records the light strength
Scanned material is stored as a bitmap. What is a bitmap?
a matrix of rows and columns of pixels
What is a pixel?
the smallest picture element that a monitor can display.
What is an individual dot on the screen represented by?
one or more bits of binary data
What is color depth?
The measurement of bits used to store information about a pixel
What is Resolution?
the number of pixels captured per inch of the original page
What is Resolution measured in?
Dots per inch (DPI)
What is Optical Corrector Recognition (OCR) software used for?
to convert scanned text images into editable text that you can modify in a word processor
What is a flatbed scanner?
A scanner that has a flat glass covered surface like a copy machine
What does a 3D specialty scanner capture?
an object’s size and shape and the data used in 3D modeling and printing.
What is an example of a specialty scanner?
Scanners at medical offices which have a slot to insert and scan insurance cards
What is a barcode?
a set of black bars used by manufacturers to look up an item’s price
What is a Universal Product Code (UPC)?
A unique barcode that each product is assigned by its manufacturer
