How to highlight lines on the coin.

Hi, I am having a coin image but I'm unable to highlight the lines or the curves.

Answer 1

[Morgan]

% LOAD IMAGE
B = imread('coin_data.png');

% CONVERT TO GRAY IMAGE
B = im2double(B);
B = rgb2gray(B);

% REMOVE BLACK BOX IN IMAGE
B(B == 0) = 1;

% YOU CAN CLIP B TO GET BETTER EDGES
% HERE BY DOING:
% B = B > lb & B < ub;

% EDGE DETECT
BW = edge(B);

% VIEW IMAGE
imshow(B);
colorbar

% SHOW EDGES
hold on
contour(BW,'-r')

And this is the result I get

[Shubham]

Thank you