Frame Combine; 1Frame Combine Timeout - Photon Focus MV8-D8424-G01-GT User Manual

11.10 Frame Combine

Very high frame rates that are well over 1000 fps can be achieved for small ROIs. Every frame
(image) activates an interrupt in the GigE software which will issue a high CPU load or the
frame rate can not be handled at all by an overload of interrupts.
To solve this issue, the FrameCombine mode has been implemented in this camera. In this
mode, the data of n images are bundled into one frame. In the example shown in Fig. 11.18 4
frames are combined into one frame (FrameCombineNrFrames=4). In this case there are 4 times
less software interrupts that indicate a new frame than without FrameCombine and the CPU
load is significantly reduced. Instead of receiving 4 images with 5 rows, only one image with 20
rows is received which reduces the frame rate on the computer side. Without FrameCombine,
the CPU load on the computer might be too high to receive all images and images might be
dropped. The value n (=FrameCombineNrFrames) can be set by the user. This value should be set so
that the resulting frame rate is well below 1000 fps (e.g. at 100 fps). E.g. if the camera shows a
maximal frame rate of 4000 (property AcquisitionFrameRateMax), then FrameCombineNrFrames
could be set to 40 to have a resulting frame rate of 100 fps.
The FrameCombineNrFrames value should be set so that the resulting frame rate is
well below 1000 fps.
Figure 11.18: Example for FrameCombine with 4 frames
11.10.1 Frame Combine Timeout
There exist possibilities to transmit the combined frame even if there is not enough data to fill
it. E.g. It can be desirable to get the data immediately after an item on a conveyor belt has
passed.
FrameCombine_Timeout A timeout can be specified after which the combined frame will be
transmitted, regardless if there was enough data to fill it. The timeout counter is reset
after each frame and counts until a new trigger has been detected or until the timeout is
reached.
A FrameCombine_Timeout value of 0 disables the FrameCombine timeout fea-
ture.
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11.10 Frame Combine
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