how can i connect two objects with SE

Hello,

i want to ask something, it's about choosing Structure Element for binary image

i have an binary image like this :

here is my code :

    function process2_erode_Callback(hObject, eventdata, handles)
    % hObject    handle to process2_erode (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)
    global mol;
    global jk;
    mol = handles.m;
    [rows, columns] = size(mol);%
    SE = strel('arbitrary',eye(1));

    jk = imerode(mol,SE);
    %jk3 = bwmorph(mol,'thicken','inf');
    jk3 = imdilate(jk,SE);
    guidata(hObject,handles);
    axes(handles.axes6); %#ok
    imshow(jk3);
    %handles.m = jk3;
    guidata(hObject,handles);
    msgbox('Morphology SUCCESSFUL !');

i also insert my matlab program.

my question is : i want to connecting the curve object into one object, what is the best SE which i can use to connect it? I need reccomendation for this

Thanks