Video Data Processing - Ricoh FAX550 Service Manual

DETAILED SECTION DESCRIPTIONS
SCANNER

2.1.2. Video Data Processing

Output from the CCD
A
DC
Filter
VIDEO
PROCESSOR
Reference: Group 3
Facsimile Manual,
section 2-3
Comparator
Background
Detection
OR
Processing
Reduction
Auto Shading
Memory
WHITE
WAVEFORM
A/D
Converter
Amplifier
Data Processing
Circuits
Corrected Data from the Auto Shading Circuit
Gamma
Correction,
MTF
Edge
Detection
NON-EDGE
ELEMENTS
Reduction
Halftone
B
A
Process Selector
To CPU and Modem
2-3
FEEDBACK
Peak
Hold
CORRECTED
DATA
To the CPU
and Modem
Error
Basic
Diffusion
Halftone
Halftone
Process
Process
EDGE
ELEMENTS
Image/Text
Detection
B'
November 30th, 1991
2