EasyManuals Logo

FLIR X-Series User Manual

FLIR X-Series
91 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #60 background imageLoading...
Page #60 background image
5 X-series Camera Controller
X-series User’s Manual
60
x
Detector 14-bit A/D
+
Digital
Gain/Offset
x +
NUC Table
Bad Pixel
Replacement
Algorithm
Corrected Data
Uncorrected Data
x +
Analog
Gain/Offset
x +
X-series Signal Processing Chain
The analog FPA data is passed through an analog gain and offset stage that are factory-set to ensure
that the entire range of the FPA output is matched to the A/D input. This is shown in the figure below,
which plots the digital output of a typical camera against background photon flux. The actual scale of
the flux depends on integration time setting. The figure shows an example where the user desires to
operate the camera between two flux points such that these two limits use the entire 14 bit range.
With no global gain and offset adjustment these two points correspond to 3200 counts and 15800
counts for the low and high flux ranges respectively. Having obtained these numbers, we set the gain
to use the full 14-bit range:
30.1
320015800
16383
=
=gain
Since the offset stage is after the gain stage, we calculate the offset value using the gain:
41603200 == gainoffset
These values are then entered into the global gain and offset controls and the linearized (red curve)
transfer function shown is the result.
The available gain range is 1.999 to essentially zero; the available offset range is + 32767. The
default values are a gain of 1 and an offset of zero. Because the system sensitivity (NET) is set prior
to the A/D stages, there is no detrimental effect on performance from the use of the global gain and
offset controls.
Use of global gain and offset to linearize the camera
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
Background flux
Typical camera
setup, gain = 1
offset = 0
As linearized
desired operating range

Table of Contents

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the FLIR X-Series and is the answer not in the manual?

FLIR X-Series Specifications

General IconGeneral
BrandFLIR
ModelX-Series
CategoryDigital Camera
LanguageEnglish

Related product manuals