How can I automatically find the maximum distance between two objects?

I want to find the distance from the dot on the left to the furthest point on the object to the right. How could I do this?

Thank you very much

Answer 1

[Matt J]

justdot= bwareafilt(yourImage,1,'smallest'); %image of dot only

S=regionprops(justdot,'Centroid');  %find center of dot
ctr=flip( round(S.Centroid) );
ic=ctr(1);
jc=ctr(2);

[Iw,Jw]=find( yourImage & ~justdot );  %coordinates of white pixels excluding dot

max_distance=sqrt(  max( (ic-Iw).^2+(jc-Jw).^2) ) ); %the result