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5 • Optical Mark Recognition (OMR)
5-8 SV40221 Rev. A
OMR Specifications
The mark must be a solid black line between 1pt and 2pts thick 1/64”
(0.35mm to 0.7mm) and at least 3/8” (10mm) wide.
Each mark position must be evenly spaced and at least 1/10”
(2.54mm) apart.
The maximum amount of mark positions allowed within the code is
24; this includes ignored marks. The total length of the OMR code
should not exceed 2-3/4” (70mm).
The center line of the marks must fall within a range from 2-3/8”
(59mm) to 4-3/4” (108mm) from the center line of the sheet. The
OMR marks should not be closer than 3/4” (20mm) from the Lead
Edge or 1-3/16” (30mm) from the Trail Edge of the sheet.
An area around the marks should be kept clear from print, etc. that
may be read by the scanner in error, this area is called the Clear
Zone. The Clear Zone must be at least 1/8” (3mm) each side of the
marks, 3/4” (20mm) before the first mark and 3/4” (20mm) after the
last mark.
There should be no print on the reverse of the sheet immediately
behind the Clear Zone.
Diagrams NOT to scale
2-3/4” (70mm) max
min 1/10” pitch
(10 lines/inch)
3/8”
(10mm)
min
1pt to 2pt
1/64” (0.35mm to
0.7mm) thick
1/8” (3mm)
min
1/8” (3mm)
min
3/4” (20mm) min
3/4” (20mm) min
Clear Zone
SV40221 Rev A book.indb 5-8 9/14/2004 5:51:18 PM