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"parameter K". This is standardized as shown in the table below. By this
measure, if, for example, a transmission error prevents data from being
decoded correctly, decoding can be performed correctly from after the next
MH data. The line that was coded by the MH scheme to be referenced to at
this time is called the "reference line."
Table 5-4 Parameter K
Vertical Scanning Line Density
Standard (3.85 lines/mm)
Fine (7.7 lines/mm)
Super-fine (15.4 lines/mm)
Ultra-fine (15.4 lines/mm)
Without parameter
In case of parameter K = 4
4 lines
4 lines
Fig. 5-16 Transmission Error and Parameter K
G3 FACSIMILE COMMUNICATIONS
Parameter K
2
4
4
4
Transmission error
Subsequent lines cannot
be correctly decoded.
Transmission error
These two scanlines cannot
be correctly decoded.
Error can be recovered
at this line.
MH coding (reference line)
MR coding
1
2
3
4
5
6
ït
çi
5–19
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