Ordering number : EN*5685
COMS IC
LC82104
Color Image Processing IC for Fax
and Scanner Applications
Preliminary
Overview
The LC82104 converts analog image signals from a CCD
and contact image sensor to precise multi-valued image
data using a built-in 8-bit A/D converter and internal
image-processing functions. The LC82104 includes a 6-bit
reference potential setting D/A converter for the 8-bit A/D
converter and CDS function, and produces high-quality
multi-valued data by performing shading correction for all
pixels, color balance adjustment, and gamma conversion
with support for arbitrary gamma curves. It also includes a
multi-value data resolution conversion function, and thus
can support input from and output to systems with
different resolutions. Furthermore, it can perform high-
quality conversion to two-valued images from the green
signal. The LC82104 can process up to 5400 pixels by
three lines and requires no external memory whatsoever
for use in distortion correction and other processing. Thus
this IC can implement the image processing required for
color scanners, FAX, copiers, OCRs and similar
applications.
鈥?Sensor drive circuit
(Supports all types of CCD and CIS sensors)
鈥?Digital CDS (Correlated double sampling)
鈥?Digital clamp circuit
(Single-point clamping, even field clamping)
鈥?Shading correction
(Bright correction: all-pixel correction, dark correction:
either all-pixel correction or set dark correction
attenuation data)
鈥?Gamma correction
(Supports user-defined curves for each of R, G, and B
using 8-bit data)
鈥?Color balance (Gain control)
鈥?Main scan direction multi-value resolution conversion
(From 2/1 to 1/2, in units of 1/256)
鈥?Binary coding
(Simple binary coding (slicing), and 64-level error
diffusion)
*: The green signal is converted to a binary signal.
鈥?Memory manager
(Image data buffer memory controller)
鈥?Fabricated in a CMOS process for 5-V single-voltage
power supply operation.
Features
鈥?Number of pixels processed:
2700 pixels
脳
3 lines
(Both bright and dark correction applied to all pixels)
5400 pixels
脳
3 lines
(Only bright correction applied to all pixels)
鈥?Processing speed:
1,200 ns/pixel maximum (3-color CCD) (When CLKIN
is 20 MHz)
400 ns/pixel maximum (CIS and black-and-white CCD)
(When CLKIN is 20 MHz)
鈥?8-bit A/D converter
(Includes a sensor signal timing adjustment function.)
鈥?6-bit D/A converter for setting the A/D converter
reference potential
Package Dimensions
unit: mm
3181B-SQFP100
[LC82104]
SANYO: SQFP100
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
30698RM(OT) No. 5685-1/6
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