IMAQ: recognize circular and triangular pattern

[coward16]

I am working on a project where I am getting a pipe as input picture. The background and lightning can vary and its hard to get the same image over and over.

I would like to get the Y position of the triangular and circular phase on the pipe.

In the PNG file you see:

Figure A:        Typical source picture

Figure B-E:    Different results after filtering source picture

Is there some way to recognize the phases outlined in red?

I am new to pattern recognition and can't find any good examples for this task.

Thanks

[robertpf]

Hi,

Yes, it is possible to detect the geometries outlined in red. For example you could use edge detection within a Region Of Interest, or a Geomatric Matching. For more informations on the algorithms please view this KB article:

IMAQ Vision Algorithms

http://digital.ni.com/public.nsf/allkb/D6B6B5D928C186B486256F4D00046CFC?OpenDocument

I'm also adding a KB on geometric matching:

Why Wouldn't the Selected Template Match with the Main Image When Using Geometric Pattern Matching?

http://digital.ni.com/public.nsf/allkb/D9420536790B209886257559000B02DB?OpenDocument

and finally some community examples with vision and detection / matching:

Continuous Edge Detection Using Morphological Filters

https://decibel.ni.com/content/docs/DOC-24921

Edge Detection with a USB Camera

https://decibel.ni.com/content/docs/DOC-34733

Verify Wires: Vision Builder AI

https://decibel.ni.com/content/docs/DOC-31260

Identify "Perfection" Piece Using Geometric Pattern Matching

https://decibel.ni.com/content/docs/DOC-30575

Identify Multiple "Perfection" Pieces Using Geometric Edge Matching

https://decibel.ni.com/content/docs/DOC-30576

Simple Face Detection using IMAQ

https://decibel.ni.com/content/docs/DOC-33812

Use Vision Assistant to Find Matched Patterns

https://decibel.ni.com/content/docs/DOC-32828

Pool Playing Robot

https://decibel.ni.com/content/docs/DOC-16484

EDIT: added more examples

Best regards,