How can I outline the inside border of this ring? ie. highlight the inner circle

I am trying to highlight the inner border of this ring in the image attached. Is this possible?

Thank you for your help

Answer 1

[Star Strider]

Try this:

I = imread('Love Matlab image.jpeg');
IBW = im2bw(I);
Bnd = bwboundaries(IBW);

figure
imshow(IBW)
hold on
plot(Bnd{4}(:,2), Bnd{4}(:,1), '-r', 'LineWidth',2)
hold off

producing:

[Love Matlab]

thank you!

[Star Strider]

As always, my pleasure!