Canon FACSIMILE BASIC 2000 Service Manual page 183

4.5.5 Explanation of bi-level image header section (BIH)
The BIH is shown in the construction figure below. It designates the image
size, number of lines per stripe, model template, etc.
DL
1byte 1byte
4.5.6 Explanation and parameters for each symbol used in
BIH
The 0x of each parameter shows that the following integers are hexideci-
mal.
Symbol
DL
D
P
FILL
XD
YD
L0
Mx
My
Order
Option
DPTABLE
HITOLO
BIH (Bi-level Image Header)
D P FILL XD
1byte 1byte 4byte 4byte
- - - -
HITOLO
1bit 1bit 1bit 1bit
-
LRLTWO VLENGTH
1bit 1bit
Fig. 5-35 BIH Construction Diagram
Meaning
Initial layer to be transmitted
Number of differential layers
Number of bit planes
Fill
Horizontal image size at layer D
Vertical image size at layer D
Lines per stripe at the lowest resolu-
tion
Maximum horizontal offset allowed
for AT pixel
Maximum vertical offset allowed for
AT pixel
The order in which stripe data is
attached
Option
Private DP table
Transmission order of differential lay-
ers
G3 FACSIMILE COMMUNICATIONS
YD L0 Mx My Orber
4byte 1byte 1byte 1byte
SEQ ILEAVE SMID
1bit 1bit 1bit 1bit
TPDON TPBON DPON DPPRIV
1bit 1bit 1bit 1bit 1bit
Parameter
0x00 fixed
0x00 fixed
0x00 fixed
0x00 fixed
0xXXXXXXXX Document width
(No. of bits)
0xXXXXXXXX Document length
(No. of bits)
0xXXXXXXXX Basically, 1 stripe is 128 lines
(0x00000080).
Stripes with other numbers of
lines are possible when the
other machine can receive in
option mode.
0xXX 0-127 pixels
0x00 fixed
Upper 4 bits 0
fixed
Upper 1 bit 0
fixed
0 or 1728 bytes
1 bit 0 fixed
1
2
Option DPTABLE
1byte 0/1728
byte
3
DPLAST
4
1bit
5
6
Reference
ït
çi
5–41