2017.06.19 FwdMan2.8.17.docx 14-123
14.2.2 Exposure
Aperture Adjustment
Shutter Speed and Field of Depth depends on the F-stop setting, the size of the aperture
opening. The lens aperture ranges from F 1.4 to F 22 typically
Smaller F-stops numbers = larger opening.
Larger openings = more light.
Larger openings = faster shutter speed.
Larger openings = narrows the Field of Depth. Background and foreground becomes blurred,
out of focus.
Balancing Shutter and Aperture
F stop 4 is a good all-round setting. On bright sunny days this gives fast shutter speed, to
avoid motion blur, together with “full” Field of Depth.
On dark overcast days and when approaching sunset you can continue to drive as fast as the
trucks do and produce good sharp images.
Shutter is defined as the integration time of the incoming light where both the Manual and
Auto Shutter are supported.
The shutter range varies from 1us ~ 3600sec.
Camera Auto Exposure Control
The automatic shutter/gain mode is based on a feedback loop which calculates the average
pixel luminance. Then the average is compared with the exposure reference value, adjusting
shutter and gain accordingly.
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