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7.2.8 Gamma setting (LUTC)
The AT-200CL has various gamma settings
including LUT (Look Up Table). Gamma can be
set OFF (1.0), 0.6, 0.45, or to exhibit
characteristics set using LUT.
The following shows the typical characteristics
in the case of gamma 0.6.
CCD out
Analog Signal
Black
Setup 3.6%, 25mV
200mV
700mV
800mV
230mV↑
7.2.9 Knee compensation (KN)
If the relation of input and output is linear (1:1), the
output signal is saturated at a certain level of the
input signal and details cannot be reproduced in the
saturated area. The knee compensation circuit
maintains linear output up to a knee point and
compresses the level after the knee point. This is set
by a knee slope function. AT-200CL supports up to
200% signal compression by knee slope. Factory
default is OFF.
Functions
Knee Point
Knee Slope
7.2.10 Test pattern generator
The AT-200CL has an internal test pattern generator. These signals are output as the last
process of the digital signal processing circuit and can be used for adjustment of the related
system. The AT-200CL has a total of 15 test pattern types.
7.2.11 Center marker
At-200CL is equipped with a center marker generator. The center marker can be selected
from three types as described below.
AT-200CL
Digital Out(36bit)
128LSB
3560LSB
4095LSB
Data length
Setting range
10bit
12bit
- 21 -
1023
890
32
Black Level
0
25
Analog Signal [mV]
Fig.21. Gamma setting
Digital Out(30bit)
32LSB
890LSB
1023LSB
Knee Slope
Fig.22. Example of Knee characteristics
0LSB ～ 1023LSB
0(x0.0005) ～ 4095(x2.0000)
White Clip Level
100% Level
700
835
Digital Out(24bit)
8LSB
222LSB
255LSB
Knee Point
Video Input
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