OKIDATA DOC-IT3000, Service Manual

Page: 36 / 428

Page: 22
Service Guide DOC-IT3000/4000
Chapter 2 Principles of Operation
Image Control LSI
· Outline
- The selective emphasis error diffusion LSI performs the binary processing of a
multivalue image signal. This LSI can select and execute various binary processing
methods such as:
- a simple binary method that attaches importance to the character quality
- a systematic dither method that reproduces a high-quality photograph and half-tone dot
- a selective emphasis error diffusion method that reproduces the high-quality coexistent
image of a photograph, halftone dot, or character.
· Features
- Processing functions
- Simple binary processing (The slice level can be set.)
- Selective emphasis binary processing (The slice level can be set.)
- Binary processing of systematic dither method (64-scale, 8-bit pattern load system)
- Binary processing of error diffusion method (256 scales)
- Binary processing of selective emphasis error diffusion method (256 scales)
- Input digital, 8-bit
- Brightness can be compensated.
- (y) compensation can be performed. (Compensation coefficients load expression)
- Zoom can be specified in the range of 4% to 200% in 1% units.
- Processing speed is more than approximately 200ns per pixel.
- +5vdc single power supply
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)