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8.8.1
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
frame rate and then check to see if the maximum allowed frame rate has increased:
The time that it takes to transmit a frame out of the camera is the main limiting factor on the frame rate. You
can decrease the frame transmission time (and thus increase the maximum allowed frame rate) by doing
one or more of the following:
Use an 8 bit pixel data format rather than a 12 bit pixel format. Images with fewer bits per pixel will take
less time to transmit.
Use a smaller ROI. Decreasing the ROI means that the camera has less data to transmit and therefore
the transmission time will decrease.
Use binning. When pixels are binned, there is less data to transmit and therefore the transmission time
will decrease.
Make sure that the Packet Size (GevSCPSPacketSize) parameter is set as high as possible for your
system and that the Inter-Packet delay (GevSCPD) parameter is set as low as possible.
If you have the Sensor Digitization Taps parameter set to One, consider changing the value to Two. This
will usually increase the maximum allowed frame rate.
If you are using normal exposure times and you are using the camera at its maximum resolution, your
exposure time will not normally restrict the frame rate. However, if you are using long exposure times or
small region 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.)
An important thing to keep in mind is a common mistake new camera users frequently make
when they are working with exposure time. They will often use a very long exposure time
without realizing that this can severely limit the camera's maximum allowed frame rate. As an
example, assume that your camera is set to use a 1 second exposure time. In this case,
because each frame acquisition will take at least 1 second to be completed, the camera will
only be able to acquire a maximum of one frame per second. Even if the camera's nominal
maximum frame rate is, for example, 2 frames per second, it will only be able to acquire one
frame per second because the exposure time is set much higher than normal.
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VA GigE series
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