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USER GUIDE

NI-IMAQ for USB Cameras
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The NI-IMAQ for USB Cameras User Guide contains information you need to get started with NI-IMAQ for USB Cameras. This guide presents the basics of image acquisition, provides an overview of the software, and briefly describes application development with NI-IMAQ for USB Cameras.

Contents
Contents.................................................................................................. 1 Conventions ............................................................................................ 1 About NI-IMAQ for USB Cameras ........................................................ 2 Application Development Environments......................................... 2 Building Applications with NI-IMAQ for USB Cameras ...................... 3Architecture ..................................................................................... 3 NI-IMAQ for USB Cameras VI Location ....................................... 3 Example Programs ........................................................................... 5 Buffer Management ................................................................................ 5 Acquisition Types................................................................................... 6 Snap ................................................................................................. 6 Grab ................................................................................................. 6 NI-IMAQ for USB Cameras and NI Vision Assistant............................ 7 Error Codes............................................................................................. 9

Conventions
The following conventions are used in this manual: » The » symbol leads you through nested menu items and dialog box options to a final action. The sequence File»Page Setup»Options directs you to pull down the File menu, select the Page Setup item, and select Options from the last dialog box. This icondenotes a note, which alerts you to important information.

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Bold text denotes items that you must select or click in the software, such as menu items and dialog box options. Bold text also denotes parameter names. Italic text denotes variables, emphasis, a cross reference, or an introduction to a key concept. This font also denotes text that is a placeholder for a word or value that youmust supply. Text in this font denotes text or characters that you should enter from the keyboard, sections of code, programming examples, and syntax examples. This font is also used for the proper names of disk drives, paths, directories, programs, subprograms, subroutines, device names, functions, operations, variables, filenames, and extensions.

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About NI-IMAQ for USBCameras
NI-IMAQ for USB Cameras provides the ability to use USB cameras that have Direct Show Filters with the NI Vision Assistant or LabVIEW and IMAQ Vision. The cameras may operate at various resolutions and frame rates, depending on camera capabilities. NI-IMAQ for USB Cameras can acquire and set properties using the camera manufacturer driver and Direct Show functions. For NI-IMAQ for USB Camerasto use the camera successfully, the camera manufacturer driver needs to be correctly installed and recognized by the operating system. Refer to your camera documentation for instructions about how to correctly install the manufacturer driver.

Application Development Environments
NI-IMAQ for USB Cameras supports the following application development environments for Windows 2000/XP: • •LabVIEW 7.0 or later with IMAQ Vision 7.1 or later Vision Assistant 7.1 or later

NI-IMAQ for USB Cameras User Guide

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Building Applications with NI-IMAQ for USB Cameras
The NI-IMAQ for USB Cameras Virtual Instrument (VI) Library is a series of LabVIEW VIs for using LabVIEW with your USB camera and is included with the NI-IMAQ for USB Cameras software. IMAQ Vision for LabVIEW is an...