Image segmentation on radar image

General information for the business: Matlab
Description of requirements/functionality: I have many radar images conducted on a piece of wood with and without pipes under the wood.

I have tested the piece of wood with radar when there is just air (stage 1), then after, I tested it with radar when there are three pipes under the wood (stage 2).

now, I have to remove the noise reflection that happen in the stage one and two and keep just the pipes reflection in the image using image segmentation methods in the matlab.

I have to use four methods of segmentation, would you make a suggestion for that and implement and I will compare among the results.

Regards
OS requirements: Windows
Extra notes: