AT-200CL
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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.
Fig.21. Gamma setting
CCD out
Analog Signal
Digital Out(36bit) Digital Out(30bit)
Digital Out(24bit)
Black
Setup 3.6%, 25mV
128LSB
32LSB
8LSB
200mV
700mV
3560LSB
890LSB
222LSB
230mV
↑
800mV
4095LSB
1023LSB
255LSB
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.
Fig.22. Example of Knee characteristics
Functions
Data length
Setting range
Knee Point
10bit
0LSB
～
1023LSB
Knee Slope
12bit
0(x0.0005)
～
4095(x2.0000)
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.
Analog Signal [mV]
Black Level
1023
890
32
0
25
700
Di
gi
ta
l
Ou
t
[L
SB
]
100% Level
White Clip Level
835
Video Input
V
id
eo
O
ut
pu
t
Knee Slope
Knee Point
