Document processing
Generic MICR Fundamentals Guide
5-5
Types of reader sorters
The following recognition technologies have been incorporated
into MICR reader sorter devices.
Waveform reader sorters
Waveform reader sorters measure the magnetic signal waveform
or pattern of the MICR character as the documents pass the
read head. Waveform reader sorters are often referred to as
“single slot” or “single gap” readers because the read head
contains one magnetically sensitive slot or gap, which covers the
height of the entire character string in the clear band. Each MICR
character that passes the read slot produces a waveform signal.
This signal is compared against the known waveforms of the
MICR character set to determine which character was read.
Waveform reader sorters are also called “DC readers,” because
they use a constant magnetic field to magnetize the characters.
Waveform reader sorters are generally low to medium speed
reading devices. The reject rates for these readers is slightly
higher than for matrix readers.
Matrix or AC reader sorters
Matrix readers use a series of small read heads that are stacked
in close proximity, each of which reads a small strip of the
character string. The segments of the MICR characters register
as binary magnetic flux transitions at each read head. These
pulses are combined and used to build a two dimensional bitmap
for each character. This bitmap is then compared to known
bitmap patterns to determine the identity of the character.
To simplify bitmapping, readings from groups of heads are
logically combined to produce a single value. This slightly
increases sensitivity to spots, but results in lower reject rates for
matrix readers.
Matrix readers are also called “AC readers,” because they use
an oscillating magnetic field to magnetize the characters. These
oscillations cause a series of waveform peaks in a character
stroke, which are recorded as a binary 1 in the bitmap image of
the character.
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Страница 105: ...Quality control Generic MICR Fundamentals Guide 6 19 Figure 6 12 E13B characters and waveforms...
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