Plot a filled black circle on a certain background

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Chen
Chen el 10 de Ag. de 2020
Respondida: Image Analyst el 11 de Ag. de 2020
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 el 11 de Ag. de 2020

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