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Unformatted text preview: ctly fed into the input device and automatically processed thereafter. Besides enabling
faster processing of cheques, this technology also ensures accuracy of data entry because
most of the information is pre-printed on the cheque and is directly fed to the computer.
However, MICR has not been adopted by other industries because the currently
supported character set has only 14 symbols (10 digits and 4 special characters). No
alphabetic characters are available.
A digitizer is an input device used for converting (digitizing) pictures, maps and drawings
into digital form foi storage in computers. For example, the JC and y coordinates of points
in a drawing may be stored in digital form. This enables re-creation of the drawing from
the stored information whenever required as well as easy incorporation of changes in the
drawing as and when required.
As shown in Figure 9.16, a digitizer consists of a digitizing tablet (also known as
graphics tablet) associated wit! a stylus. The digitizing tablet is a flat surface that contains
hundreds cf fine copper wires forming a grid. Each copper wire receives electric pulses.
The digitizing tablet can be spread over a working table and is connected to a computer.
The stylus is like a pen or a lens-like cursor with a cross-hair and button. The stylus is
connected to the tablet and can be pressed down at a point on the tablet to input the (x, y)
coordinates of the point. When the stylus is moved on the tablet, the cursor on the
computer's screen moves simultaneously to a corresponding position on the screen to
provide visual feedback to the operator. This enables the operator to draw sketches
directly or to input sketched drawings very easily. Inputting drawings or developing
sketches using a digitizer is further simplified by the fact that poorly sketched lines, arcs
and other graphical objects are automatically input as mathematically precise objects, like
straight lines and smooth curves. Digitizers are commonly used in the area of Computer Aided Design (CAD) by architects
and engineers to design cars, buildings,...
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This document was uploaded on 04/07/2014.
- Spring '14