I would like to remove the "triangle protuberance" in the belowing image, but I don't want to change the other part of the image. As the "triangle protuberance" is connected to the main "ellispe" like part, I could not use "bwareopen" function to remove it. I have tried the " watershed", but don't have a good output. Besides, I also have tried "imclose" and "imopen" combination, it smoothed the other part unintendly. I need some suggestion in how to deal with this problem. Any advise in processing procedure, matlab function or algorithm will be appreciated. Thank you.
The original image has been attached.