Encoding and decoding methods for use in facsimile
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United States of America Patent
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Dec 24, 1996
Issued Date -
N/A
app pub date -
Nov 13, 1995
filing date -
Aug 1, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An encoding (or decoding) method, by which raw data of 1 line is converted into, for example, modified Huffman (MH) code (or MH code is converted into raw data) by obtaining a cumulative run-length code every transition point, at which there occurs a transition or change between a run of white pixels to another contiguous run of black pixels, from the beginning of the line and then converting the cumulative run-length code to the MH code (or converting the MH code to the cumulative run-length code). The cumulative run-length code is defined by both of data, which indicates that a pixel of a run just prior to the transition point is black or white, and data representing a cumulative run-length of the run up to the pixel thereof just prior to the transition point. Thus, an encoding or decoding processing can be performed at a high speed.
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