Advanced parameters and commands
Pearleye Technical Manual
V2.2.0
56
Temperature drift compensation (m, n, o, p)
The output data of a microbolometer system is highly affected by the tempera-
ture of the camera. Therefore digital drift compensation can be activated in the
post processing chain. An internal temperature sensor (Dallas DS18B20) calcu-
lates an offset that is added to each pixel. The parameters for this compensation
are normally preset by factory with measured values for each camera. However,
the user can modify these parameters, especially the additional offset parame-
ter
p=<p16>
.
With
m=<p8>
the drift compensation can be activated/deactivated and a fil-
ter for the temperature values can be switched on/off.
The parameter
n=<p16>
specifies the slope of the linear drift compensation
term n*T+o. The value specifies the slope in counts per °C and is represented in
10.6 bit fixed point two’s complement notation.
With
o=<p16>
the offset is specified. The value is represented in 16 bits fixed
point two’s complement notation.
An additional offset (user offset) can be specified by
p=<p16>
. This parame-
ter is represented in 16 bits fixed point two’s complement notation.
GigE Vision feature name
Description
BPC_OperationMode
Operation mode of the bad pixel correction.
(F=<value> command)
BPC_CorrectionData_FileNumber
File number of the correction data for the bad pixel correction.
(C=<value> command)
Table 24: Camera special feature: BadPixelCorrection
m 0
Operation Mode
Drift compensation
7
6
5
4
3
2
1
0
-
-
-
f
-
-
-
m
rw
rw
Bit group
Value (hex)
Description
f
0
Filter is enabled
1
Filter is bypassed
m
0
Drift compensation deactivated
1
Drift compensation activated
Table 25: Temperature drift compensation: values
