Maximum Allowed Frame Rate - Basler ace acA640-90gm User Manual

Image Acquisition Control

7.12 Maximum Allowed Frame Rate

In general, the maximum allowed acquisition frame rate on any ace camera can be limited by three
factors:
The amount of time it takes to read an acquired frame out of the imaging sensor and into the
camera's frame buffer. This time varies depending on the height of the frame. Frames with a
smaller height take less time to read out of the sensor. The frame height is determined by the
camera's AOI Height settings.
The exposure time for acquired frames. If you use very long exposure times, you can acquire
fewer frames per second.
The amount of time that it takes to transmit an acquired frame from the camera to your host
PC. The amount of time needed to transmit a frame depends on the bandwidth assigned to the
camera.
On acA750-30 cameras, an additional factor is involved:
The Field Output Mode parameter setting. If a camera is set for the Field 0 or the Field 1 mode,
it can output approximately twice as many frames as it can with the camera set for the
Concatenated New Fields or the Deinterlaced New Fields output mode.
There are two ways that you can determine the maximum allowed acquisition frame rate with your
current camera settings:
You can use the online frame rate calculator found in the Support section of our website:
www.baslerweb.com
You can use the Basler pylon API to read the value of the camera's Resulting Frame Rate Abs
parameter (see the next page).
For more information about AOI Height settings, see Section 10.5 on
For more information about the field output modes on acA750-30 cameras, see Section 7.5 on
page 87.
When the camera's acquisition mode is set to single frame, the maximum possible
acquisition frame rate for a given AOI cannot be achieved. This is true because
the camera performs a complete internal setup cycle for each single frame and
because it cannot be operated with "overlapped" exposure.
To achieve the maximum possible possible acquisition frame rate, set the camera
for the continuous acquisition mode and use "overlapped" exposure.
For more information about overlapped exposure, see Section 7.11 on
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