Imaq Image Display Control - Zoom tool - zoom factor changes slowly

[StefanW]

Hi at all,

we have a strange behavior with the zoom factor of the Image Display Control in an Labview executable.
Ususally by clicking into the image with the zoom tool activated, the zoom factor changes from 1,2,4,8,16, ... ("x2")
Now we have one PC, where it changes from 1,2,3,4,5,... ("+1")
Has anyone an idea on which windows setting this behavior depends on? The PC runs with Windows XP SP3, the LV-Exe was built
with LabVIEW 8.5.1 and the Vision Development Module 8.5.0. Is there any regsitry setting where I can adjust the "click intensity" or
something like that? Or can I set a property of the image control to force a specific behavior?
Actually I have never seen this behavior before, I only know the half/double mode. 
In the software the operator has to search for fiducials on PCBs what means he has to click several times into the image.
Changing in the Mode "+1" instead of "x2" is not acceptable for him.

Thanks for your help!
Stefan

[Jan_Kniewasser]

Hello Stefan,

not long ago I had a quite similar problem with one of our customers, but he uses the mouse wheel to zoom in and out. After a while we found out the the mouse driver is the problem. He installed the latest driver and this solved the problem. This could be a reason!

I would recommend, that you also check the properties for the display. Install the latest IMAQ driver on your system and then please give us some informations if anything could solve the proble.

Regards, Jan

[StefanW]

Hallo Jan,

Thank You for Your reply.
The software is for a machine which is produced in series, so we cannot start changing imaq versions.
Unfortenately I don't have direct access to the PC where the issue is, so I cannot try something too often.
But ok it is worth a try to compare the mouse driver version to different systems.
I know there are options for the mouse wheel (scroll 1 line, 3 lines, 1 page, ...) in the driver settings, but it's
difficult to imagine, there might be a similar setting for the left-click.

Regards, Stefan

[StefanW]

Hello again,

we just updatetd to LV 2010, VDM 2010 and VAS August 2010 and now this annoying behavior is no longer limited to a few PCs - it occurs on every PC we have tested so long (5). It is the same under LabVIEW as well as in an executable - the zoom factor steps from 1x, 2x, 3x, 4x, ... and so on instead of 1x, 2x, 4x, 8x.

For an image with 1200 dpi of a large PCB this means about 24 clicks instead of 6 clicks for taking a closer look at e.g. a diode.

Could this be an update issue? For one of the five PCs I uninstalled every NI-Software (MsiBlast) and deleted the National Instruments folder afterwards, but of course it was not a virgin PC. Has anybody set up the 2010 environment an a fresh PC and can tell if how the zoom factor behaves?

Is there someone from NI reading who can tell if this behavior is wanted (I could not find anything in the change-logs) or if it is possible control the behavior?

Regards, Stefan

[Marian_O]

Hi Stefan,

I am working on a workaround and will post this one here.

Best regards

[Marian_O]

Hello Stefan,

thank you for posting at the National Instruments forum. The "Zoom Behaviour" was changed due to customer requests. I totally agree with you, that it is not the best solution to click 24-times to get the desired region of interest.

I created a small example for LabVIEW 2010, which uses a property node and event structure, to perform the zoom programmatically.

Best regards