IMAQ Find Edge shows straight edge beyond part

Hello
I am working on finding the sides of my simple part with the IMAQ Find Edge tool. To make it simple, I gave my image an extreme threshold with IMAQ Threshold manually set 0 - 230 so My part basically shows up Black against a white background. I set the ROI of the Part from IMAQ Count Objects 2, expanded that ROI by a couple pixels on each corner of the bounding box and input that into my IMAQ Find Edge tool. I have two IMAQ Find Edges, one looking left to right finding all edges and the other top to bottom finding all edges. It took a while, but I have all Straight edges appearing using the results from Find Edge.
What I don't understand is why these lines are longer than the edges of the part sides? I have attached the image to show what I mean. The edges (yellow) are clearly found on the part, but the resulting lines (red) are beyond these points.
Kelsi
Attachments:
Find edges.png ‏7 KB

Also am I setting up my edge detect functions wrong? I am filtering my image so I only see the object, no shadows. I am thresholding the image to basically outline it. Now I am using the edge detect function to find the edges and it can't seem to find them all. I have an object that I set my ROI about it, and I have the settings for the edge detect on very low to detect basically any edges possible. It still does not consistently see the edges of my object.
Is there a more reliable way to consistently see these edges?
Kelsi
Attachments:
edge detect1.png ‏874 KB
edge detect2.png ‏888 KB
edge detect3.png ‏203 KB

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IMAQ Find Edge shows straight edge beyond part

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