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Chapter 2 Hardware Overview

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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.

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