Specifications

COPYRIGHT
©
1999 CANON INC. CANON SUPER G3 FAX BOARD-F1 REV.0 MAY 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
2-53
CHAPTER 2 OPERATION AND TIMING
7. Bi-Level Image Data (BID)
BID is constructed as shown in Figure 2-412, and as many RID units exist as there are stripes.
BID consists of a combination of a floating marker code and an image data block which has been
processed by JBIG image compression coding called “SDE” (stripe data entity).
Figure 2-412 Construction of BID
8. Symbols and Parameters Used by BID
a. Floating Marker Code
The floating marker code is set at the head of a stripe data (SDE) unit.
To distinguish the floating marker code from another type of code, ESC (escape code; 0xFF) is
always attached at the head.
A floating marker code consists of a marker code and a parameter. The notation “0x” of each
marker code indicates that the number that follows is a hexadecimal number.
ABORT (0x05)
Indicates suspension of the code and may appear anywhere in a code.
Stripe
BIM (binary image data block)
Floating marker code
ESC
1byte
Marker code
1byte
RESERVE
ABORT
NEWLEN
ATMOVE
COMMENT
Parameter
1byte
PSCD
Variable
Image data
Variable
ESC
1byte
STUFF
Variable
ESC
1byte
SDNORRM/SDRST
1byte
Original length
4byte
Shift start line
4byte
Shift position(X)
1byte
Shift position(Y)
1byte
Comment length
4byte
SDE (stripe data body)
Floating marker doce
SDE
BID (binary image data block)
Stripe
ESC 0x05