Point Grey Flea3 FL3-U3 - 7.9 Shutter

Point Grey Flea3 USB 3.0 Technical Reference 7 Imaging Parameters and Control
//Set the white balance red channel to 500.
prop.valueA = 500;
//Set the white balance blue channel to 850.
prop.valueB = 850;
//Set the property.
error = cam.SetProperty( &prop );
7.9 Shutter
The camera supports automatic, manual and one-push control of the image sensor shutter time. Shutter times are
scaled by the divider of the basic frame rate. For example, dividing the frame rate by two (e.g. 15 FPS to 7.5 FPS)
causes the maximum shutter time to double (e.g. 66ms to 133ms).
The supported shutter time range is 0.008ms to 1 second (FL3-U3-13S2) / 0.006ms to 1 second (FL3-U3-13Y3) /
0.016ms to 1 second (FL3-U3-13E4) / 0.01ms to 32 seconds (FL3-U3-32S2) / 0.021ms to 1 second (FL3-U3-88S2).
The terms “integration” and “exposure” are often used interchangeably with “shutter”.
Auto/one-push shutter control is only supported in free-running trigger mode.
The time between the end of shutter for consecutive frames will always be constant. However, if the shutter time is
continually changing (e.g. shutter is in Auto mode being controlled by Auto Exposure), the time between the
beginning of consecutive integrations will change. If the shutter time is constant, the time between integrations will
also be constant.
The camera continually exposes and reads image data off of the sensor under the following conditions:
1. The camera is powered up; and
2. The camera is in free running, not asynchronous trigger, mode. When in async trigger mode, the camera
simply clears thesensor and does not read the data off the sensor.
The camera continues to expose images even when isochronous data transfer is disabled and images are not being
streamed to the computer. The camera continues exposing images even when ISO is off in order to keep things such
as the auto exposure algorithm (if enabled) running. This is done to ensure that when a user starts requesting images
(ISO turned on), the first image received is properly exposed.
When operating in free-running mode, changes to the shutter value take effect with the next captured image, or the
one after next. Changes to shutter in asynchronous trigger mode generally take effect on the next trigger.
Revised 9/27/2012
Copyright ©2011-2012 Point Grey Research Inc.
111