Canon FAX-L1000 User Manual

Page 247

3-103

FAX-L1000 Chapter 3: Technical Reference

3.2.7 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).

Figure 3-52 BID Construction Diagram

3.2.8 Explanation and parameters for each symbol used in BID

a) Floating marker code section

The floating marker code is set at the head of the stripe data entity (SDE).
In order to distinguish the encoding and the floating marker code, it is imperative that ESC
(escape code: 0xFF) be set at the head.
The following marker code and parameters are in the floating marker code.
The 0x of each marker code shows that the following integers are hexadecimal.
ABORT (Abort: 0x05)

Encoding interruption. Only the abort code can be made to appear anywhere.
ESC 0x05

ATMOVE (AT move: 0x06)

Designates from which line the movement of the AT pixel starts, and where it will

move to.

ESC 0x06 yAT:Movement-starting line Tx:Movement Position(X) Ty:Movement Position (Y)

Floating marker code

SDE (Stripe Data Entity)

Marker code

Parameter

1byte

RESERVE

ABORT

NEWLEN

1byte

4bytes

ATMOVE

4bytes

yAT

COMMENT

4bytes

1byte

Floating marker code

SDE

1byte

SDNORM/SDRST

PSCD

ESC

1byte

Variable

ESC

1byte

ESC

1byte

Variable

Image data

STUFF

BID (Bi-level Image Data)

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Stripe