Image Processing Flow - Ricoh B064 Service Manual

6.4.2 IMAGE PROCESSING FLOW

Image processing is done by the IPU (Image Processing Unit), following the steps
shown below.
Overall image processing for this machine is designed to:
• Target edges with filters to improve the angles of text characters and reduce the
occurrence of moiré filled areas.
• Improve the evenness of granular areas in images
Shading Correction
"
Gamma Correction
"
Smoothing
"
Main Scan Magnification
"
Auto Select
"
Filtering
"
Independent Dot Erase
"
Line Width Correction
"
Density Control
"
Grayscale Processing
"
Video Path
"
LD Unit
SM
Corrects the dispersion of the scanning lens
and CCD.
Background erase
Smoothing filter to reduce the occurrence of
moiré.
Determines if an image is text or raster
image data and processes the data
accordingly.
Selects the best methods for Filtering,
Density Control, and Grayscale Processing.
MTF and smoothing (MTF filter of previous
machines)
Either of two filters is selected by Auto
Select above.
Removes isolated pixels.
Employs one of two gamma tables,
selected by Auto Select above
Error diffusion, dithering, or binary picture
processing
Black-and-white digitization or dithering is
selected by "Auto Select above.
#! Application (printer)
6-23
IMAGE PROCESSING
B064/B065