IMAQ Rotation Detect

[LHarris]

Most of the time the IMAQ Rotation Detect vi seems to be doing a reasonable job (within the confines of single-degree precision), but occasionally it is giving me a drastically wrong value - for example, it says the rotation angle is 280 degrees, when it's actually only 3.

I can't currently see anything distinctive about the images that produce this, but they are consistent (ie Image 329 will always produce the same problem).

I'm currently working with the Eval version of Vision prior to (hopefully) purchasing it, so I can't look into the VI to see exactly what it is doing.

Has anyone else run into problems with it, or have an alternative method of detecting rotation in an image?

[tnt]

Has anyone else run into problems with it?

I think I have a similar problem with the IMAQ match pattern (where rotation is allowed within a certain range).

Have you already found a solution/workaround?

[LHarris]

I think I have a similar problem with the IMAQ match pattern (where rotation is allowed within a certain range).

Have you already found a solution/workaround?

Not yet - I'm still waiting on approval to purchase (big company so moving slow).

I think cleaning up any extraneous data or noise in the image helps (using thresholding) as well as ensuring an accurate ROI & rotation point (center of the circle) - or as accurate as you can get.

Other than that, I am just trying to filter ridiculous values - but of course that leaves me with no data on those comparisons.