Image Processing Path - Ricoh IS450S Service Manual

IMAGE PROCESSING PATH

22 December 1998
7.2 IMAGE PROCESSING PATH
The following image processing is for the scanner with the optional IPU.
S C U Optional IPU S C U
Size Magnification/ Optional Section White/Black M e m o r y
I P U
Detection Mirror Process I P U A r e a conversion Controller
Binary
Processing
Binary
Filtering
Grayscale D y n a m i c
γ
correction
Filtering Threshold
Auto Photo/Letter
Sparation
G411O500.WMF
Dynamic Threshold
A suitable threshold value is determined based on the original.
Auto Photo/Letter Separation
Generally, text areas have strong contrast between the image and the background.
In photo areas, mid-range gray areas are common. By using these characteristics,
the original image is separated into text and photo areas.
Section Area
The original image is separated into specified areas. Each area is processed using
the specified scanning mode.
Size Detection
See Detailed Section Descriptions – Scanner Processes.
7-2