Mh Coding Scheme (One-Dimensional Coding Scheme) - Canon FACSIMILE BASIC 2000 Service Manual

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G3 FACSIMILE COMMUNICATIONS
The Modified READ coding scheme (MR coding scheme) and the Modi-
fied Modified READ scheme (MMR coding scheme) are widely used as
optional coding schemes for G3 facsimiles.
The JBIG (Joint Bi-level Image experts Group) coding scheme that started
to gain in popularity at the same time as V.34 MODEMs has also been rec-
ommended by ITU-T, and is expected to further gain in popularity.
The following describes the principles of operation of these coding
schemes in order.
4.2
MH Coding Scheme (One-dimensional Coding
Scheme)
The following describes an example using an A4 size document.
If a document is viewed in unit of single lines, text areas are black, and
areas without text are white. All of the scanlines are expressed as a group
of white runs and black runs.
The length of these runs is called the "run length". The MH coding scheme
codes each line using two elements, the run length and the run color.
5–10
A4 size document (1728 bits)
Scanline
Fig. 5-8 Example of Scanline
1728 bits
Scanline

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