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How to remove unwanted areas/pixels from image ?

Hi guys,

I do not know that the question has been asked or not before this. You think that you have an leaf image in your handle. The image does not only contains leaf but also some lines, or fuzzy-things. Okay I hope It is clear until this. Now, You have to remove that lines and fuzzy things in order to make some processes. You just want to take leaf in the image and also just the external contours of the leaf. Do you have an idea ? Which functions or steps do you use for this ? Finally, This process must be very clear. I mean, there should be any fuzzy things in the image, except leaf.

I put an example. These are before and after. Just give me an opinion or something like that.

Original Image After the process

As you see, The problem is that. I just want to take the external contours of the main leaf in the image. Or If it is possible, The image can be cleaned. The second important point is that the process should be standard for all images.

I'm waiting your ideas. Thanks in advance !