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LC821031

Sanyo Semicon Device
Part Number LC821031
Manufacturer Sanyo Semicon Device
Description Image-Processing
Published Mar 22, 2005
Detailed Description Ordering number : EN*5735 CMOS LSI LC821031 Image-Processing IC for Facsimile, Copier, and OCR Products Preliminaly Ov...
Datasheet PDF File LC821031 PDF File

LC821031
LC821031

Overview
Ordering number : EN*5735 CMOS LSI LC821031 Image-Processing IC for Facsimile, Copier, and OCR Products Preliminaly Overview The LC821031 converts analog video signals from CCD and contact sensors to high-quality binary image data.
It includes both an 8-bit A/D converter and a 6-bit D/A converter for setting the reference potential and creates high-quality multi-valued data using a gamma conversion technique that supports arbitrary gamma curves.
It also provides both black and white all-pixel distortion correction and multi-valued resolution conversion.
It then applies two-dimensional filtering to this multi-valued data to separate the document image into text, photograph, and halftone areas.
After converting the image to a binary image using an error diffusion technique that acquires high-quality images, it applies reduction in both the primary and secondary scan directions.
Since the LC821031 limits the number of pixels processed per line to 3072 pixels, it needs no external memory to implement this processing.
Thus the LC821031 implements the image processing used by facsimile, copier, and OCR products.
• Gamma correction (Supports user-defined curves: 8-bit data) • Image area separation • Simple binary coding (fixed threshold and density adaptive threshold) • Halftone processing: error diffusion method (64 levels) • Multi-value resolution conversion (Conversion ratios of 1:2, 2:3, 3:2, and 2:1) • Binary image reduction (Main scan line direction: decimation, fine black line retention, fine white line retention; secondary scan line direction: decimation, fine line retention) • Fabricated in a CMOS process for single 5-V powersupply and low power.
Package Dimensions unit: mm 3159-QFP64E [LC821031] Features • Number of pixels processed: 3072 pixels/line • Processing speed: 250 ns/pixel, maximum (When CLKIN = 32 MHz) • 8-bit A/D converter (Includes a sensor signal timing adjustment function.
) • 6-bit D/A converter for setting the A/D converter reference potential...


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