Edge detection using IMAQ Find Edge/IMAQ Edge Tool 3

[LordSnow]

Hi,

I have several images with useless background around a rectangular ROI (coordinates unknown!). So I tried using the two VIs mentioned above in order to detect these edges so that I can remove them. Regretfully, this does not work as planned.

IMAQ Find Edge usually finds an edge, but not where it should be. The edge detection is earlier than I want it to be.

IMAQ Edge Tool 3 sometimes does not find an edge at all, sometimes it finds the edge perfectly. Here I use the 'get best edge' option, which delivers the best results with all the images I tested it with.

All the other options are also not changed while running the VI with the images I have.

Does anyone have intimate knowledge of these VIs' algorithms, how they work, how they can be manipulated, ... ?

[Duffy2007]

Hello LordSnow,

in this folders are the manuals C:\Program Files\National Instruments\Vision\Documentation

the NIVisionConcepts.chm (under Machine Vision --> Edge detection --> Concepts) describe how it works.

I hope this helps if not, can you post the code and some pictures with a describtion, what should be detected?

[ABCPrograms]

Hi,

Can you upload an example image?

That would clarify what you're trying to do?

Most of the time a change of mindset solves the problem.

[Jandy]

Some might not find the documentation in the Program Files area.

Later versions of windows installation put the documentation here:

C:\Users\Public\Documents\National Instruments\Vision\Documentation