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BENEFITS OF RASTER SCAN DEVICES OVER RANDOM DEVICES AND M
Transcript of BENEFITS OF RASTER SCAN DEVICES OVER RANDOM DEVICES AND M
NAME- Priyanka Khanna
RASTER SCAN DISPLAY AND RANDOM DISPLAY
Raster: A rectangular array of points or dot.
An image is subdivided into a sequence of (usually horizontal) strips known as "scan lines“ which can be further divided into discrete pixels for processing in a computer system.
A raster image is a collection of dots called pixels
The cell size determines the resolution at which the data is represented.
Due to the nature of the data storage technique data analysis is usually easy to program and quick to perform.
2 The inherent nature of raster maps, e.g. one attribute maps, is ideally suited for mathematical modeling and quantitative analysis.
3 Discrete data, e.g. forestry stands, is accommodated equally well as continuous data, e.g. elevation data, and facilitates the integrating of the two data types. Grid-cell systems are very compatible with raster-based output devices, e.g. electrostatic plotters, graphic terminals.
Suited for realistic display of screens
Home television computer printers create their images basically by raster scanning. Laser printers use a spinning polygonal mirror (or an optical equivalent) to scan across the photosensitive drum, and paper movement provides the other scan axis
Common raster image formats include BMP (Windows Bitmap), JPEG (Joint Photographics Expert Group), GIF (Graphics Interchange Format) , PNG (Portable Network Graphic), PSD (Adobe PhotoShop)
Why it is named mouse?
It looks like mouse and beecause it acts like real mouse going to places for food
In 1968, a man named Douglas Engelbart created this special tool to help people control their computers.
It was a small wooden block on wheels, and there was a long cable sticking out
The ball mouse replaced the external wheels
with a single ball that could rotate in any direction. Perpendicular chopper wheels
Optical mice make use of one or
light-emitting diodes (LEDs)
Gives feedback through vibration
To surf by touch requires the user to be
able to feel depth or hardness; this ability was realized with the first
Our future mouse