National Instruments PCI-1411 - Manual (Page 24)

Chapter 3 Hardware Overview
© National Instruments Corporation 3-5 IMAQ PCI/PXI-1411 User Manual
• Region of interest—The PCI/PXI-1411 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 into with onboard or system memory. However,
when you enable the region-of-interest circuitry, the board acquires
only a selected subset of the image frame.
• Scaling down—The scaling down circuitry also controls the active
acquisition region. The PCI/PXI-1411 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-1411 can select every
pixel, every other pixel, every fourth pixel, or every eighth pixel. For
active line selection, the PCI/PXI-1411 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.