LC82101 Просмотр технического описания (PDF) - SANYO -> Panasonic

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LC82101

Image Processing Circuit for FAX, Copier, and OCR Products

SANYO -> Panasonic 

Ordering number : EN*4982A

Preliminary

CMOS LSI

LC82101

Image Processing Circuit

for FAX, Copier, and OCR Products

Overview

The LC82101 converts an analog image signal from a

CCD or contact sensor to high-quality binary image data.

The LC82101 uses an internal 8-bit A/D converter for

A/D conversion, and in addition to the orthodox dithering

technique, also supports an error diffusion technique that

allows an even higher quality image to be acquired. These

techniques apply to the whole range of processing

supported by the LC82101, including full-pixel distortion

correction, gamma conversion for arbitrary gamma

curves, image compression processing, two-dimensional

filtering, halftone processing, and image separation

processing to separate documents into text, photograph,

and halftone regions. Thus this LSI implements the image

processing required by FAX, copier, and OCR systems.

Features

• Number of pixels processed

2048 pixels/line (64 KB memory, white correction only)

4096 pixels/line (256 KB memory, both white and black

correction)

8192 pixels/line (256 KB memory, white correction

only)

• Processing speed

500 ns/pixel maximum (The processing time for 1 pixel

is 16/SYSCLK.)

• Supports medium speed products with a single external

memory chip

100 ns access time memory allows 800 ns/pixel

processing, and 60 ns access time memory allows

500 ns/pixel processing.

• AGC (The A/D converter high-level reference voltage is

varied from 1.2 to 4.2 V in 0.2 V steps.)

• Built-in 8-bit A/D converter (includes a sensor signal

delay adjustment function)

• Sensor drive circuit (supports CCD and all CIS types)

• Digital clamp (single-point clamp, even/odd clamp)

• Distortion correction (white correction, black correction,

full-pixel correction)

• Gamma correction (supports user-defined curves)

• Image area separation (text, photographs, halftone)

• Simple binary-conversion processing (fixed threshold

level, density-adaptive threshold level)

• Halftone processing

Structural dithering (64 levels), settable dithering

threshold level

Error diffusion technique (64 levels)

• Image reduction (thinning, fine black line retaining, fine

white line retaining)

• Single-voltage 5 V supply and low power due to CMOS

process fabrication

Package Dimensions

unit: mm

3174-QFP80E

[LC82101]

SANYO: QIP80E

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

63095HA (OT) No. 4982-1/5

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