How to reduce perimeter of Image in Matlab?

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I want to erode (Reduce the perimeter) of the below image by 7 pixels such that only the image within the red circle is kept.
I thought this could be done with imerode, but this also reduces the central pixels which I do not want!
Thank You :)

Accepted Answer

Image Analyst
Image Analyst on 3 Sep 2018
Try this:
se = strel('disk', 7, 0);
binaryImage = grayImage > 0; % Threshold.
mask = imerode(binaryImage, se);
grayImage(~mask) = 0;

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