Specifications
CHAPTER 2 OPERATION AND TIMING
2-50
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1999 CANON INC. CANON SUPER G3 FAX BOARD-F1 REV.0 MAY 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
4. Construction of Image Data by JBIG Image Compression Coding
An image is coded in units of blocks called “stripes” as shown in Figure 2-409.
Figure 2-409 Construction of JBIG Image Data
When coding is done, the image data is called “BIE” (Bi-level Image Entity), and consists of a bi-
level image header (BIH) and bi-level image data (BID) as shown:
BIH
BID
BID
BID
SDE
SDE
SDE
Width of original (XD)
Length of
original (YD)
Original JBIG coding
Header
Floating
marker code
Floating
marker code
Floating
marker code
StripeLength of stripe
JBIG coding
Stripe
Stripe
BIE (actual bi-level as it is)
BIH (bi-level image header) BID (bi-level image data) BID (bi-level image data)
Figure 2-410 Construction of BIE