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Chapter 2 Hardware Overview
NI PCI-1405 User Manual 2-4 ni.com
Acquisition Window Control
You can configure numerous parameters on the NI 1405 to control the
video acquisition window. A brief description of each parameter follows:
• Acquisition window—The NI 1405 allows you to specify a particular
region of active pixels and active lines within the incoming video data.
The active pixel region selects the starting pixel and number of pixels
to be acquired relative to the assertion edge of the horizontal (or line)
enable signal from the camera. The active line region selects the
starting line and number of lines to be acquired relative to the assertion
edge of the vertical (or frame) enable signal.
• Region of interest—The NI 1405 uses a second level of active pixel
and active line regions for selecting a region of interest. When you
disable the region-of-interest circuitry, the device stores the entire
acquisition window into onboard or system memory. However, when
you enable the region-of-interest circuitry, the device acquires only a
selected subset of the image frame.