Canon DR-9080C Service Manual page 50

CHAPTER 2 FUNCTIONS & OPERATION
Since the data are processed as 8 bits within
the machine, they are converted from 10 bits to 8
bits at the Image acquisition unit.
colored image data,
executed.
• 10 bits to 8 bits
• RGB rearranging
The QQ-Chip used in this machine is
designed to handle
processing. Image processors 1 and 2 for
conducting equivalent processing are provided
within the QQ-Chip. However, since the software
is not available for the earlier model, both
processors serve to conduct the processing of
image data. A multi-stream function can output
different modes of data from a single scan. The
description below
processing in the earlier model where the
mult-stream function is not available.
Image resolution conversion is carried out by
image processor 1. For converting resolution,
one of two methods, thinning-out and smoothing,
is used according to the image mode.
smoothing process also helps to reduce moire
patterns.
The image data are stored in the SDRAM,
and accessed via the SDRAM_I/F (Interface).
Image processor 2 handles brightness
adjustment, contrast adjustment, and gamma
correction.
2 - 26
And, for
RGB rearranging
future multi-stream
describes the image
The
COPYRIGHT © 2003 CANON ELECTRONICS INC.
Image processor 3 handles edge emphasis,
simple binarizing, error diffusion, and automatic
brightness adjustment. The automatic brightness
is adjustment is valid for simple binary mode.
In the JPEG module, the grayscale and color
data can be compressed.
selected, the image data size is reduced by
compression within this machine so that it can be
transferred to the personal computer in less time.
As a result, more documents can be scanned in a
given time.
Finally, processed image data are sent from
the DMA controller to the computer either through
the SCSI or USB interface.
Other image processing is carried out on the
personal computer.
When JPEG is
CANON DR-6080/9080C REV.0 SEPT. 2003