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CHAPTER 4 IMAGE PROCESSING SYSTEM
4-20
COPYRIGHT
©
1999 CANON INC. CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.
J. Black Pixel Count
In this block, the black pixels in image data are counted to obtain an estimate of the amount of
toner on paper. Using the resulting data, the copier optimizes the current level of the separation DC
bias.
Figure 4-309 Range of Counting Black Pixels
Image
leading edge
40 mm
Original
The black pixels within a width of 40 mm
along the image leading edge are counted
to obtain an estimate of the amount of toner
per unit area.