Canon MultiPASS C530 Service Manual page 134

Example:
A brief explanation of how the study table works is given below.
It is assumed that each of the model template pixels 1~10 in the image below are white.
1. In this case, the model template pixel pattern is 000h.
2. The predicted value of pixel pattern 000h for pixel "X" is "white," but it is actually black. Thus the
prediction is "inaccurate."
3. The status ST is "0", so the probability estimation table is consulted, and the next status is moved to
"1." At the same time, by the reversal of the predicted value, the next prediction is for "black."
Original image
1 2 3
4 5 6 7 8
9 10 X
X is actualy black
Figure 2-35 Study Table Study Example 1
4. Next, the model template is moved to the adjoining pixel in order to perform the next prediction. At
this time, pixels 1~9 of the model template are white, and pixel 10 is black.
5. In this case, the model template pixel pattern is 001h.
6. The predicted value of pixel pattern 001h for pixel "X" is "white," and it is actually white. Thus the
prediction is "accurate."
7. The status ST is "0", so the probability estimation table is consulted, and the next status is moved to
"1". The prediction for the next pixel remains "white".
Move to next pixel
1 2 3
4 5 6 7 8
9 10 X
X is actualy white
Figure 2-36 Study Table Study Example 2
The study table is constantly updated in this way, increasing the probability of accurate predictions.
MultiPASS C530/C560 Chapter 2: Technical Reference
Study table for current pixel
Pixel Actual Status
Predicted Accurate/
pattern value ST
value Inaccurate
000h 0 (white) 1 (black)
Inaccurate
001h
0 (white)
002h
0 (white)
Probability estimation table
ST LSZ NLPS NMPS SWITCH
0 5A1Dh 1 1
1 2586h 14 2
2 1114h 16 3
3 080Bh 18 4
Study table for current pixel
Pixel Actual Status
Predicted Accurate/
pattern value ST
Inaccurate
value
0 0 0 h 1 (black)
0 0 1 h 0 (white) 0 (white) Accurate
0 0 2 h
0 (white)
Probability estimation table
ST LSZ NLPS NMPS SWITCH
0 5A1Dh 1 1
1 2586h 14 2
2 1114h 16 3
3 080Bh 18 4
2-55
Study table for next pixel
Pixel Predicted Actual
Accurate/
pattern value
value Inaccurate
0 000h 1 (black)
0 001h 0 (white)
0 002h
0 (white)
1
0
0
0
Study table for next pixel
Pixel Actual
Predicted Accurate/
pattern value
value Inaccurate
1 0 0 0 h 1 (black)
0
0 0 1 h 0 (white)
0 0 0 2 h
0 (white)
1
0
0
0
Status
ST
1
0
0
Status
ST
1
1
0