Canon FACSIMILE BASIC 2000 Service Manual page 184

G3 FACSIMILE COMMUNICATIONS
4.5.7 Explanation of bi-level image data (BID) section
BID is as shown in the construction figure below, and consists only of the
number of stripes.
BID is constructed by the connection of the floating marker code and the
section which includes the actual image data encoded with JBIG image
compression encoding, called SDE (Stripe Data Entity).
5–42
Symbol Meaning
SEQ Indication of progressive-compatible
sequential coding
ILEAVE Interleaved transmission order of
multiple bit plane
SMID Transmission order of stripes
LRLTWO Number of reference lines
VLENGTH Indication of possible use of
NEWLEN marker segment
TPDON Use of TP for Typical Prediction for
differential layers
TPBON Use of TP for base layer
DPON Use of Deterministic Prediction
DPPRIV Use of private DP table
DPLAST Use of last DP table
Stripe
BID (Bi-level Image Data)
Floating marker code
ESC Marker code Parameter
1byte 1byte 1byte
RESERVE
ABORT
NEWLEN
YD
4bytes
ATMOVE yAT
4bytes
COMMENT Lc
4bytes
Fig. 5-36 BID Construction Diagram
Parameter
1 bit 0 fixed
1 bit 0 fixed
1 bit 0 fixed
1 bit 0/1
1 bit 0/1
1 bit 0 fixed
1 bit 0/1
1 bit 0 fixed
1 bit 0 fixed
1 bit 0 fixed
--------- BID (Bi-level Image Data)
SDE (Stripe Data Entity) Floating marker code
PSCD ESC SDNORM/SDRST
Variable 1byte 1byte
Image data ESC STUFF
Variable 1byte 1byte
Tx
Ty
1byte 1byte
Reference
0: 3 lines
1: 2 lines
Use of 0: NEWLEN not
allowed
Use of 1: NEWLEN allowed
0: OFF
1: ON
Has meaning when DPON is
1.
Has meaning when DPON is
1.
Stripe
SDE