Справочник Пользователя для National Instruments IEEE 1394

© National Instruments Corporation

This chapter contains information about setting camera attributes, 
broadcasting acquired images to multiple machines, using Format 7 to 
define the size of transferred images, and triggering.

Use camera attributes to control camera-specific features, such as 
brightness and shutter speed. You can set camera attributes directly from 
the NI-IMAQ for IEEE 1394 Cameras software or through the 
Camera Attributes tab in MAX.

The following attributes are defined in the 1394 Based Digital Camera 
Specification—brightness, auto exposure, sharpness, white balance, hue, 
saturation, gamma, shutter, gain, iris, focus, temperature, zoom, pan, tilt, 
optical filter, trigger delay, frame rate prioritize, and white shading.

The LabVIEW, C, Visual Basic, and .NET APIs all provide Get Attribute 
and Set Attribute functions to modify camera attributes. However, 
supported attributes are camera specific. Refer to your camera 
documentation for information about the attributes your camera supports.

 

If your camera does not implement every attribute specified, the functions 
return an error.

Many machine vision applications involve a single host computer 
acquiring data from a single industrial camera. Other machine vision 
applications acquire data from multiple industrial cameras concurrently. 
With the broadcasting feature, a machine vision application can run on 
multiple host computers while acquiring data from a single camera, as 
shown in Figure 3-1.