AW00123402000 Image Acquisition Control
Basler ace USB 3.0 145
6.10.1 Using Basler pylon to Check the Maximum
Allowed Frame Rate
You can use the Basler pylon API to read the current value of the Resulting Frame Rate parameter
from within your application software using the Basler pylon API. The following code snippet
illustrates using the API to get the parameter value:
// Get the resulting frame rate
double d = camera.ResultingFrameRate.GetValue();
The Resulting Frame Rate parameter takes all camera settings that can influence the frame rate
into account and indicates the maximum allowed frame rate given the current settings.
You can also use the Basler pylon Viewer application to easily read the parameter.
For more information about the pylon API and pylon Viewer, see Section 3.1 on page 37.
6.10.2 Increasing the Maximum Allowed Frame Rate
You may find that you would like to acquire frames at a rate higher than the maximum allowed with
the camera’s current settings. In this case, you must adjust one or more of the factors that can
influence the maximum allowed rate and then check to see if the maximum allowed rate has
increased:
Decreasing the height of the Image ROI can have a significant impact on the maximum
allowed frame rate. If possible in your application, decrease the height of the Image ROI.
If you are using normal exposure times and you are using the camera at it’s maximum
resolution, your exposure time will not normally restrict the frame rate. However, if you are
using long exposure times or small areas of interest, it is possible that your exposure time is
limiting the maximum allowed frame rate. If you are using a long exposure time or a small ROI,
try using a shorter exposure time and see if the maximum allowed frame rate increases. (You
may need to compensate for a lower exposure time by using a brighter light source or
increasing the opening of your lens aperture.)
The frame transmission time will not normally restrict the frame rate. But if you are using
multiple cameras connected to one hub, you may find that the transmission time is restricting
the maximum allowed rate. In this case, you could use a multiport host adapter in the PC
instead of a hub.
If you are working with an acA1920-25, acA2500-14, acA3800-14 or acA4600-10 camera:
Use the normal shutter mode rather than the global reset release shutter mode. Because the
normal shutter mode allows frame acquisitions to be overlapped and the global reset release
mode does not allow overlapping, you will be able to achieve a higher frame rate when using
the normal shutter mode.
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