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1.4 Function Descriptions
In this section, we will outline the MAVIS IM-30/IM-100 camera control functions.
To ensure proper implementation, please carefully review the, limitation
parameters and formula calculations, listed below.
1.4.1 AOI (Area of Interest)
The AOI (Area of Interest) function allows users to select an area of interest,
for the camera’s CMOS array to specifically read, display, and transmit.
Figure 1-1: AOI (Area of Interest)
The AOI function will also enhance camera acquisition speed, however
users must still consider the following factors:
(1) The amount of time it takes to transfer a captured image from the
CMOS sensor to the frame buffer.
(2) The amount of time it takes to transfer an image from the frame buffer
to the PC via 1394 bus.
(3) The camera exposure time setting.
Below, are three formulas that can help you to calculate the maximum
frame rate, while using the AOI function. Please note that the lowest value
will determine the maximum frame rate for the given AOI.
Formula 1: Max. Frames/s = 1 / (((AOI High + 2) x 15.28us) + 15.28us)
Formula 2: Max. Frames/s = 1 / (Packet per frame x 125us)
Formula 3: Max. Frames/s = 1 / (exposure time in us + 28us)
For example, if your AOI is set for 200 columns wide and 240 rows high,
and exposure time is set for 1000us. Also the packet per frame with the
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