SU640CSX
4110-0462, Rev. B
Page 45 of 97
© 2016 UTC Aerospace Systems
Date Printed: 1-Dec-2016
This document does not contain any export controlled technical data.
Example
CORR:PIXEL:MAP? -- query command
OFF -- return value
5.8.9.
Perform In-Field Dark Offset Operation
This command will perform an offset correction that is stored in camera RAM memory (volatile) for a
single OPR setting, or stored to camera flash (nonvolatile) for ongoing use. This is also referred to as an
In-Field Dark Offset Correction (IFOC). This function only affects the NUC offset (CORROFFSET as
described in Section 5.7).
Preconditions:
1)
The AGC must be disabled (AGC:ENABLE OFF) when running the In-Field Dark Offset
Correction function.
2)
The scene must be dark, else the resulting non-dark-recorded offset will act like a mask or
watermark superimposed on the live video data. Zero clipping may also be possible after the
IFOC is carried out if any light is present at the FPA.
The camera can store the resulting correction frame in camera volatile memory for temporary correction
conditions that do not persist a power cycle, or the data may be written to Flash non-volatile memory for
semi-permanent use (i.e. persist power cycle, but change the next time this command is operated).
Once
overwritten, the use of a CONFIG:RESET command will not restore the original factory values.
The IFOC function sums and averages 32 or 64 frames to average the noise response by root(# of frames).
Noise is decreased by ~5 or ~8 x in this manner, respectively. More importantly is that it prevents a single
noise spectrum from being superimposed on the newly created NUC table. At normal frame rates of 30
fps, the offset data is collected in roughly 1 or 2 seconds. If a custom FRAME:PERIOD value is used, the
time for acquisition is the EXP time multiplied by either 32 or 64, depending on the value of the
<
frames
> argument.
The camera has been designed to recover from power interruptions during flash write operations. The
camera will start up normally, but it may be necessary to re-run the offset calibrations command to fix a
potentially-corrupted correction.
Description
Perform offset calibration operation.
Setting Type
N/A
Command CORR:OFFSET:CAL
arguments
Parameters
arguments: <frames> <flash> <output>
Return Values
none
Range
32
Initiates an averaging of 32 frames of field offset
calibration data where the accumulated value for each pixel
replaces the factory offset corrected pixel value. The data is
collected for the currently selected OPR and timing mode. Once
accumulated, this data will then start to be used to apply offset
correction to the pixel data for the OPR that was used when it was
collected.
