Originals; Black Pixel Count - Canon GP605 Service Manual

CHAPTER 4 IMAGE PROCESSING SYSTEM
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.
Image
leading edge
4-20
COPYRIGHT © 1999 CANON INC.
40 mm
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.
Figure 4-309 Range of Counting Black Pixels
Original
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)