How can I extract a sheet from this image?

I have a botanical tree with some leaves. I want to extract sheet A. However, sheet A remains at the top of sheet B, so that I could not find any method for processing sheet A. Are there any suggestions? Thank you very much enter image description here

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This can be a difficult problem, but still doable. I have not worked on this, but what I can offer at the moment is that you can use gabor filters to create functions for this particular sheet. Once you recognize the function vector, you can extract other leaves using this filter. Remember that you will need a collection of filters, not just one filter to fix the problem. Each filter will have its own specific behavior, against which you decide which beviour the sheet represents. This means that you are minimizing the gabor filter with the image in small windows to find the correct behavior on the sheet. Hope this helps.

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