Справочник Пользователя для National Instruments IMAQ Vision for LabWindows TM /CVI

3.

Select an IMAQ device that meets your needs. National Instruments 
offers several IMAQ devices, including analog color and monochrome 
devices as well as digital devices. Visit 

ni.com/imaq

 for more 

information about IMAQ devices.

4.

Configure the driver software for your image acquisition device. If 
you have a National Instruments image acquisition device, configure 
the NI-IMAQ driver software through MAX. Open MAX by 
double-clicking the Measurement & Automation Explorer icon on 
your desktop. Refer to the NI-IMAQ User Manual and the 
Measurement and Automation Explorer Help for IMAQ for more 
information.

After you set up your imaging system, you may want to calibrate your 
system to assign real-world coordinates to pixel coordinates. This allows 
you to compensate for perspective and nonlinear errors inherent in your 
imaging system.

Perspective errors occur when your camera axis is not perpendicular to the 
object under inspection. Nonlinear distortion may occur from aberrations 
in the camera lens. Perspective errors and lens aberrations cause images to 
appear distorted. This distortion misplaces information in an image, but it 
does not necessarily destroy the information in the image. 

Use simple calibration if you only want to assign real-world coordinates to 
pixel coordinates. Use perspective and nonlinear distortion calibration if 
you need to compensate for perspective errors and nonlinear lens distortion. 
For detailed information about calibration, refer to Chapter 5, 

.

To create an image in IMAQ Vision for LabWindows/CVI, call 

imaqCreateImage()

. This function returns an image reference you can 

use when calling other IMAQ Vision functions. The only limitation to the 
size and number of images you can acquire and process is the amount of 
memory on your computer. When you create an image, specify the type of 
the image. Table 2-1 lists the valid image types.