This Document is not yet Rated

Rate this Document

Error 1074397067: The Requested Acquisition Window is Invalid When Doing a Snap or Grab

Primary Software: LabVIEW Toolkits>>IMAQ Vision for LabVIEW
Primary Software Version: 4.0.1
Primary Software Fixed Version: N/A
Secondary Software: N/A

Problem:
I am able to snap and grab in Measurement and Automation Explorer (MAX) without any problems but whenever I snap or grab in LabVIEW I get an error:

Error 1074397067 occurred at IMAQ Snap.vi (or IMAQ Grab.vi)
Possible reason(s):
NI-IMAQ: The requested acquisition window is invalid.

This error may also occur using Vision Acquisition Express VI. It has also been found to happen after an upgrade.

Solution:
LabVIEW usually returns this error because the IMAQ camera initialization requires different acquisition window parameters than the camera file.

The following is an example of what has happened (with a FLIR camera):

MAX sets a width value of 318. The initialization call in LabVIEW sets the width to 320. Setting the width value to 318 in the camera file resolves the problem.

To fix this:

1. Save a backup copy of the camera file (just in case something goes wrong).
2. Open the camera file and view the acquisition window parameters. (e.g. AcquisitionWindow (2, 0, 320, 240))
3. Insert a property node in the LabVIEW code and read the acquisition window attributes.
4. If these are different, change the values in the camera file to the values required by the IMAQ VIs. (e.g AcquisitionWindow (2, 0, 318, 240))
5. Save the camera file.

Related Links:
Developer Zone Example: Changing Camera Configuration Programmatically
KnowledgeBase 2ORE3UZO: Programmatically Changing the Camera File for an IMAQ Interface

Attachments:





Report Date: 06/27/2008
Last Updated: 07/02/2008
Document ID: 4MQG9JSK

Your Feedback!	Poor  |  Excellent							Yes	No
Document Quality?							Answered Your Question?
	1	2	3	4	5
Document needs work? Please tell us why.
Please Contact NI for all product and support inquiries.