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48
Flare 12M CXP User's Manual
Register
Description
AEC Speed
Algorithm speed. Adjusts AEC reaction time
and settling times.
Range 0 (slowest) to 3 (fastest).
Default = 2.
AEC Enable
Enable/Disable AEC.
0 – disabled
1 – enabled, auto exposure
2 – enabled, auto ex digital gain
3 – enabled, auto ex lens aperture
4 – enabled, auto ex lens ap
digital gain
Table 15. Auto exposure and gain control commands
AEC can be enabled in either free-run or triggered exposure modes, but cannot be used
when a High Dynamic Range exposure mode is enabled.
AEC parameter values can be changed while running, for example the target luma value can
be modified while the algorithm is enabled.
3.8 AWB and AEC Zones
Auto and tracking white balance, and auto exposure control can be set to use the pixel
information in the entire image or only active zones can be used. The windowed image is
divided into 64 zones, 8x8. The size of the zones is automatically adjusted when the image
window size is changed. The horizontal zone width is counted in clock cycles, with 8 pixels
per clock. If the image height is not mod8 the zones will be centered vertically.
To view the position of the zones in the image write the Zone Overlay register to enable an
overlay. Active zones will be clear, while inactive zones will be a grey shade (alpha blend with
pixel data). Unused image areas will have a dark grey alpha blend. The overlay will only be
shown when tracking white balance or auto exposure is enabled.
The active zones are set using four registers:
AEC Zone 1
,
AEC Zone 2
,
AEC Zone 3
and
AEC Zone 4
. Each command represents 16 zones, one zone per bit, with
AEC Zone 1
starting in the top left corner of the image. Set a zone's corresponding command bit to '1' to
enable the zone, or '0' to ignore the zone.
Figure 13 shows some example zone settings.
IO Industries Inc.
www.ioindustries.com
Revision 2.0