Chapter 3
Hardware Overview
3-6
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Scaling down—The scaling-down circuitry also controls the active
acquisition region. The PCI/PXI-1422 can scale down a frame by
reducing the number of pixels per line, the number of lines per frame,
or both. For active pixel selection, the PCI/PXI-1422 can select every
pixel, every other pixel, every fourth pixel, or every eighth pixel. For
active line selection, the PCI/PXI-1422 can select every line, every
other line, every fourth line, or every eighth 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-1422 supports both interlaced
and noninterlaced digital video signals. In interlaced mode, the
PCI/PXI-1422 combines the odd and even fields into one contiguous
frame for analysis. In noninterlaced mode, each field is treated as an
independent frame.
