Chapter 3
Hardware Overview
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National Instruments Corporation
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Region of interest—The PCI/PXI-1407 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 board stores the entire
acquisition window in system memory. However, when you enable the
region-of-interest circuitry, the board transfers only a selected subset
of the digitized frame to system memory.
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Scaling down—The PCI/PXI-1407 can scale down a frame by
reducing pixels, lines, or both. For active pixel selection, the
PCI/PXI-1407 can select every pixel, every other pixel, every
fourth pixel, or every eighth pixel. For active line selection, the
PCI/PXI-1407 can select every line, every odd line, or multiples of
odd lines, for example, every other odd line or every fourth odd line.
You can use the scaling-down circuitry in conjunction with the
region-of-interest circuitry.
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Interlaced video—The PCI/PXI-1407 supports both interlaced and
noninterlaced video signals. In interlaced mode, the PCI/PXI-1407
combines the odd and even field into one contiguous frame for
analysis. In noninterlaced mode, each field is treated as an
independent frame.
Acquisition Modes
The PCI/PXI-1407 supports two video acquisition modes:
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Standard mode—In standard mode, the PCI/PXI-1407 receives an
incoming composite video signal from the external BNC connector
and generates CSYNC, HSYNC, VSYNC, and PCLK signals. The
generated CSYNC signal can be used by other image acquisition
boards or to synchronize multiple cameras.
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CSYNC external mode—In CSYNC external mode, the
PCI/PXI-1407 receives an incoming video signal (composite or
luminance) and an external CSYNC signal from an external connector.
The PCI/PXI-1407 takes the incoming CSYNC signal and generates
HSYNC, VSYNC, and PCLK signals.
