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RMV Operations Manual Revision Copyright illunis LLC, 2014
Page 68
4.6: Exposure:
Auto Exposure (Time Base)
Auto Exposure mode
automatically adjusts the
brightness of the image through exposure and gain control.
The limits of gain and exposure can be set. The AE algo-
rithm uses the AE detector window to measure the bright-
ness of the image. If the maximum exposure is reached
the camera sets a status bit to indicate the iris be opened.
There are two counter modes, a smaller mode for windows
up to 1Mega pixel and a larger mode for windows up to 16
Mega pixels. The larger counter can cover the entire active
area of the RMV-11000.
This function is quite complicated.
For help contact [email protected].
Serial Commands
Target
Index
Command
R/W Description
05
00
0x0004 = Mode Register #5
Bit# 15: AE Algorithm type
R
If Bit# 15 = 1 then AE algorithm is the newer
(time based) version.
04
1d
Auto Exposure
W
0x0000 = Disable AE
0x0001 = Enable Fast AE
0x0002 = Enable Slow AE
0x0003 = Enable small AED counter (1mpix)
0x0004 = Enable large AED counter(16mpix)
0x0005 = Enable AED averaging
0x0006 = Disable AED averaging
04
1e
AE Set point
R/W
The detector value that the AE attempts to
reach (including hysteresis).
The set-point is dependent on the AED win-
dow size and AED maximum value
04
1f
AE Hysteresis
R/W
Added and subtracted from set point to de-
termine a stable area for the AE.
04
20
AE max gain
R/W
Maximum digital gain to use in AE
04
21
AE min gain
R/W
Minimum digital gain to use in AE (should be
0x1000 = 1.0X gain)
04
22
AE max exposure
R/W
maximum exposure time
04
23
AE min exposure
R/W
Minimum exposure time
04
26
AE detector
R
Read by AE algorithm to determine bright-
ness of the image.
04
31
AE detector Average
R
Running average of previous AED’s
04
32
AE Vsync Count
R/W
Set to 3 in FRM, 1 in TPE mode
04
33
AE exposure denominator
R/W
Use ~10 for indoor light
Use ~200 for outdoor lighting
Smaller is faster, too small is unstable
04
34
AE gain denominator
R/W
Use ~2 for indoor light
Use ~20 for outdoor lighting
05
00
0x0004 = Mode Register #5
Bit# 1: AE Close IRIS Request
Indicates that the image is too bright for the
AE and the IRIS should be closed if possible.
05
00
0x0004 = Mode Register #5
Bit# 0: AE Open IRIS Request
Indicates that the image is to dim for the AE
and the IRIS should be opened if possible.
Quick FAQ’s:
►The AE algorithm adjusts both exposure and gain
to control the image brightness.
►The limits of minimum and maximum gain can be
set. This allows for control of noise .
►AE does work in TPE mode, it does not work in
TME, TOE or TDE modes.
►AE uses digital gain (analog gain is fixed).
►
The exposure limits are set in us * 10 = ms / 100
►
Note: In free run mode (FRM) the max and min
exposures are checked and reset to the actual time
calculated by the SetFreeRunTime function. So
when you set a time, you can read it back to find
the actual time used by the AE function.