回應： Vision: How to get all edge points coordinatioin

[pkr_111]

Hi,

I tried to get all egde points of a ROI of a object with labview vision module. I used "IMAQ Find Edge VI" but it only return the coordination of  the start and the end point.

In addition, I used "IMAQ Rake 3 VI", it can get all edge points(from search lines terminal). However, it can not show these resulted points on the image, so I cannot easily confirm the edge points right or not. 

Could someone can help me about the issue: how to get all edge points coordination and show them on the image.  Thinks.

[pkr_111 · Accepted solution]

I found that the process could solve my issue: "Rake 3 vi (find first edges)" and "overlay points (show results)".

However, it seems too a little complex. Are there simple methods to achieve the same results? Could "IMAQ Find Edge" show all the edges?

Thanks.

[Bob_Schor]

Have you looked at the Examples that come with LabVIEW?  In particular, have you looked at the Magic Wand example?  Note that it produces an ROI whose edge is a curve around the selected object.  You could, of course, implement this algorithm yourself, but I suspect NI's implementation is likely to be much faster ...

Bob Schor

[pkr_111]

Hi Bob. Thanks for your reply.

The "magicwand" indeed can find the edges.

In my case, I need more flexibility about the edges searching condition.(sorry I didn't metion above)

Although, the magicwand may achieve my demands, it still need some additional proceess.

Anyway, you provide me a new, good method. Thank you again!

[PalanivelThiruvenkadam]

Try to share the actual code

[pkr_111]

Hi Palanivel,

I've already solved this issue. Thank you.

I'll be glad to post the actual code, if anyone else has meet the same problem.