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edge detection and contour extraction

I want to measure the size of the welding. The image of welding is attached below. At first I need to extract the edge of the object. I got some problem!

image description

I have tried a lot of algorithms to extract the edge, but it is hard to get the inner edge of the welding, because the image is noisy and the boundary is blurry.

image description

the image below is the ideal contour I want to get.

image description

Could someone tell how can I get it?

edge detection and contour extraction

I want to measure the size of the welding. The image of welding is attached below. At first I need to extract the edge of the object. I got some problem!

image description

I have tried a lot of algorithms to extract the edge, but it is hard to get the inner edge of the welding, because the image is noisy and the boundary is blurry.

image description

the image below is the ideal contour I want to get.

image description

Could someone tell how can I get it?

edge detection and contour extraction

I want to measure the size of the welding. The image of welding is attached below. At first I need to extract the edge of the object. I got some problem!

image description

I have tried a lot of algorithms to extract the edge, but it is hard to get the inner edge of the welding, because the image is noisy and the boundary is blurry.

image description

the image below is the ideal contour I want to get.

image description

Could someone tell how can I get it?