Passthru Operations; Passthru Modes; Bitmap Passthru Mode - Data Translation DT3120 User Manual

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Chapter 2

Passthru Operations

In a passthru operation, a DT3120 board continuously captures and

displays video data until you stop the operation. Typically, you use

passthru to view images (in as close to real time as possible for the

configuration and passthru method chosen) for the purpose of

focusing or positioning the camera.

In addition to displaying passthru data, you can continuously store

the data to user-allocated buffers in host memory, if desired. This

operation is called continuous-acquire passthru mode.

This section describes the following aspects of passthru:

• Passthru modes,

• Source origin,

• Passthru scaling, and

• Overlays.

The DT3120 board supports bitmap passthru mode and

continuous-acquire passthru mode. This section describes these

modes.

The DT3120 board supports asynchronous bitmap passthru mode.

In an asynchronous operation, the operation starts but gives control

to you immediately, allowing you to perform other operations while

data is displayed.

Bitmap passthru mode requires a frame in device memory into which

the image is captured.

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