OWL 640 N/USER MANUAL/03-20/REV1.0
8.2.2 Automatic Light Control Region of Interest
A Region of Interest (ROI) within the main active region of 640 x 512 may be defined. This
region is used to calculate peak and average video levels to drive the Automatic Light
Control (ALC) function of the camera (discussed in section 8.3.1).
The ROI offset and sizes are outlined in Figure 9.
The active ROI for the ALC can be adjusted from the
“Auto ROI”
tab in the XCAP GUI,
shown in Figure 10.
The ROI can be moved to within a resolution of 4 pixels in the X and Y, and the ROI size will
have a resolution of 4 pixels.
An optional ROI outline feature can be enabled that highlights a 1 pixel wide box around the
active ROI set. This can be enabled by selecting
“ROI Box”
from the
“ROI Highlight”
dropdown box. If the ROI highlight box is enabled or disabled, all pixels will have a gain of
1x.
If
“ROI Contrast”
is enabled, all pixels outside of the ROI selected will have a gain of 0.75x.
Figure 9: Region of Interest Size and Offset.
