Plot a filled black circle on a certain background

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Chen
Chen 2020-8-10
回答： Image Analyst 2020-8-11
I have a 344*344 grey level image with noise only. Now I want to plot a filled black circle in the middle of that gray image as background.
How can I achieve that? And I hope I can also adjust the size (scale) of the filled black circle in the middle of the image.
Thanks so much!!

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Image Analyst
Image Analyst 2020-8-11

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