Specifications
CHAPTER 2 OPERATION AND TIMING
2-46
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1999 CANON INC. CANON SUPER G3 FAX BOARD-F1 REV.0 MAY 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
4. The model template moves to the next pixel. At this time, the pixels 1 through 9 are white and
the pixel 10 is black in the model template.
5. The pixel pattern of the model template is 001h.
6. The level of prediction for the pixel in question “?” of the pixel pattern 001h is “white,” and
the actual pixel is also white. As such, the prediction is “correct.”
7. The status ST is “0,” and the result of a check against the rate of probability causes the next
status to move to “1” while keeping the next level of prediction “white” as it is.
Figure 2-406 Learning Table Operation (example 2)
In this way, the learning table continues to improve on its rate of making correct predictions.
d. The rate of probability is from ITU-T T.83. Unlike the learning table, its contents remain the
same.
Reference:
The rate of probability table shown in Table 2-402 expresses the rate of making correct/wrong
predictions in terms of an area in reference to each applicable status.
When correct predictions continue, a status number which makes the area smaller will be
selected; on the other hand, when wrong predictions continue, a status number which makes
the area larger will be selected.
Move to next pixel
? is actually white.
Pixel
pattern
Level of
prediction
Actual
value
Correct/
wrong
Status
ST
000h
001h
002h
ST
0
1
2
3
123
45678
910?
LSZ
5A1Dh
2586h
1114h
080Bh
NLPS
1
14
16
18
NMPS
1
2
3
4
SWITCH
1
0
0
0
1 (black)
0 (white)
0 (white)
1
0
0
0 (white) Correct
Pixel
pattern
Level of
prediction
Actual
value
Correct/
wrong
Status
ST
000h
001h
002h
1 (black)
1 (black)
0 (white)
Learning table for next pixelLearning table of present pixel
Rate of probability table