- Image scanner – converts images on a page to electronic signals
- Character and mark Recognition devices – scanning devices used to read
marks on documents.
- Fax machine – converts light and dark areas of an image into format that can
be sent over telephone lines.
- Barcodes readers – photoelectric scanner that reads vertical stripped
marks printed on items.
How a scanning device(Scanner) works
A light bar moves across the object being scanned (the target) and the
light is reflected to the charge coupled device (CCO) by a system of
mirrors. Each cell produces an electrical signal proportional to the strength
of the reflected light that hit it. The signal which represents one pixel in the
original images is converted into binary number and sent to the computer.
Darker portions of the target reflect less light and are given lower numbers
gregorymasila answered the question on November 27, 2017 at 10:54
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