How to detect the notches in V which

Hi all

I'm trying to detect notches in V which a selected part / King. To do this, I use filtering.

First of all, I developed a model of the notch. Can I use this template on some filtering of part/return on investment.

I have two problems here:

-Notch sizes are not always same. For example, as you can see on the image "Detect_V - Notch_01b.jpg", v-notches are smaller than the notches in v which the "Detect_V - Notch_02b.jpg".

-Sometimes find model as v-notch corresponding slots (as you can see on the image "Detect_V - Notch_01b.jpg")

Anyone has a suggestion, how can I find all the v-notches and just v-notches (not slits)?

First of all, you can improve their angle tight with a Laplacian filter:

It is easier to analyze then the contour.

I have added a filter to close the outline and remove small particles and then watched the outside line with the outline / curvature analysis tool:

First of all, I analyze with a fairly small radius and the Peak and Valley of http://zone.ni.com/reference/en-XX/help/370281P-01/imaqvision/imaq_peak-valley_detector/ detector allows to find "bumps".

It works well to find the notches and ignore the slots, but it gives 2 false positives in an image. To identify them, we must look to greater curvature

Now using the peak and Valley tool is not enough - you need to define a threshold of minimiu to do this, for example 0,1

That's all.

Put all that together, and then take care of this problem with the Warp tool: http://forums.ni.com/t5/LabVIEW-Idea-Exchange/Vision-Curvature-for-quot-closed-quot-contours/idi-p/2...

and you're done.

Tags: NI Hardware

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