How do I set the interval of my snapshot in GUI in real time?

I am counting dots per snapshot, how do I set the interval of the camera on snapshot? as well as how do I set it when the GUI detect the dots that is the time he will do the snapshot? refer code below ty for your help

% --- Executes on button press in snap_shot.
function start_snap_Callback(hObject, eventdata, handles)
% hObject    handle to snap_shot (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
set(handles.ss,'string','start');
set(handles.stop_snap,'enable','on');
while strcmp(get(handles.ss,'string'),'start') == 1
    wa = getsnapshot(vid);
    axes(handles.snap_shot);
    imshow(wa); 
    verybest; % image processing takes
    set(handles.pres,'String',Ndots);

Answer 1

[Image Analyst]

You can insert a pause(numberOfSeconds) in your while loop to have it wait whatever length of time you want. After some number of snaps, you'll probably want to do

set(handles.ss,'string', 'Stop');

to get your while loop to exit, otherwise you'll be in that loop forever. I'm also not sure how verybest() gets its data.

[Image Analyst]

Regarding your "Answer" you posted below (instead of a comment to my Answer like you should have)...

You're not assigning the Ndots string, so that line will fail. Plus you have no way to ever exit the loop like I mentioned above.

Answer 2

[michael Longard]

that is my problem now I am bad doing loop =(

this is the code on "verybest" as a image processing

sigma = 5; % Gaussian smoothing, adapted to the size of the eggs
thres = 0.9; % binary threshold, adapted to the brightness of the eggs
G = rgb2gray(im2double(wa));
B = im2bw(imfilter(G, fspecial('gaussian', sigma*3, sigma), 'replicate'), thres);
Bl = bwlabel(B);
Neggs = max(Bl(:))

how do I put that while on snapshot sir? =(

[Image Analyst]

In your main program, call it like this:

Neggs = verybest(wa); % Do image processing on this snapshot.

[michael Longard]

% --- Executes on button press in snap_shot.
function start_snap_Callback(hObject, eventdata, handles)
% hObject    handle to snap_shot (see GCBO)
        % eventdata  reserved - to be defined in a future version of MATLAB
        % handles    structure with handles and user data (see GUIDATA)
        set(handles.ss,'string','start');
        set(handles.stop_snap,'enable','on');
        while strcmp(get(handles.ss,'string'),'start') == 1
            wa = getsnapshot(vid);
            axes(handles.snap_shot);
            imshow(wa); 
            Neggs = verybest(wa); % if true code
          end
    set(handles.pres,'String',Ndots);

is that correct sir? but I want snapshot is already set?