Processing Chain Overview And Description; Analog Processing; Digital Processing - Dalsa PC-30-02K80 User Manual

Piranha Color Camera User's Manual
Example:
3.13 Processing Chain Overview and
Description
The following diagram shows a simplified block diagram of the camera's analog and
digital processing chain. The analog processing chain begins with an analog gain
adjustment, followed by an analog offset adjustment. These adjustments are applied to
the video analog signal prior to its digitization by an A/D converter.
The digital processing chain contains the spatial correction, non-linearity look-up table
(LUT) correction, FPN correction, the PRNU correction, the background subtract, the
digital gain, and the background add. All of these elements are user programmable.
Figure 7: Signal Processing Chain
analog video

Analog Processing

Optimizing offset performance and gain in the analog domain allows you to achieve
a better signal-to-noise ratio and dynamic range use. Perform all analog adjustments
prior to any digital adjustments.
Analog gain (
the signal strength before the A/D conversion (and before noise is added to the
signal).
The analog offset (
into the video path to ensure that the A/D is functioning properly. The analog
offset should be set so that it is at least 3 times the RMS noise value at the current
gain.

Digital Processing

To optimize camera performance, complete all analog adjustments before digital
signal adjustments.
Fixed pattern noise (FPN) calibration (calculated using the
to subtract away individual pixel dark current.
DALSA
sah 2
Analog Processing
analog
analog LUT
offset
gain
addition
sag,ccg
sao
or command) is multiplied by the analog signal to increase
sag ccg
command) or black level is an "artificial" offset introduced
sao
03-032-10211-01
Digital Processing
PRNU
coefficients
eil
ccp,cpa
digital
offset
sdo
FPN
coefficients
ccf
ccf
digital system background background
background
gain
addition addition
subtract
ssg sab
ssb
command) is used
37
digital video digital video
5/9/2007