add an slider to get value for activecontour

% Display segmented image
BWsIbf = activecontour(ImCh1,BWCh1, 400, 'edge');

%   FinalImwithMask=imfuse(BWsIbf,ImCh1);
%   imshow(FinalImwithMask);
 % figure, imshow(ImCh1);
  %title('Segmented Image');

    [B,L] = bwboundaries(BWsIbf,'noholes');
  imshow(ImCh1,[]);%label2rgb(L, @jet, [.5 .5 .5]))
   hold on
   for k = 1:length(B)
      boundary = B{k};
     plot(boundary(:,2), boundary(:,1), 'r', 'LineWidth', 2);

   end

[Santhana Raj]

Is there a question there somewhere??

[KSSV]

@ Santhana Raj the user want's to add an slider to get value for activecontour. So he is asking us to include it in his code I suppose.

[Peyman Obeidy]

KSSV, you are correct, I am so new to creating GUI. I spend a whole day on this problem. I would like to create a GUI without GUIDE that displays an image and have a slider.

I would appreciate your help. Cheers Peyman

[Peyman Obeidy]

This is how far I get it (see the code below), but I am getting an error:

function making_SliderForIm(ImCh1,BWCh1)

global I 
global Imask

Imask=BWCh1;
I=ImCh1;
imshow(I,[]);

%create a slider
sld=uicontrol('Style', 'slider',...
    'Min',1,'Max',50,'Value',41,...
    'Position', [400 20 120 20],...
    'Callback', @SliderVal);

      function SliderVal(source,event)
          val=source.Value;

% Display segmented image
BWsIbf = activecontour(I,Imask, 1+val, 'edge');

      [B,L] = bwboundaries(BWsIbf,'noholes');
    imshow(I,[]);%label2rgb(L, @jet, [.5 .5 .5]))
     hold on
     for k = 1:length(B)
        boundary = B{k};
       plot(boundary(:,2), boundary(:,1), 'r', 'LineWidth', 2);
     end
      end
   end

the error is :

Error using activecontour
Expected input number 3, N, to be integer-valued.

Error in activecontour>parse_inputs (line 302)
        validateattributes(N,{'numeric'},{'positive','scalar','finite', ...

Error in activecontour (line 224)
[A, mask, N, method, smoothfactor,contractionbias] = parse_inputs(varargin{:});

[Adam]

sliders have floating point values when you drag them. You can just use

round( val )

to make it integer.

[Peyman Obeidy]

I used ceil , thanks.

There is another problem, I need the image to get updated. At the moment, it get the value and open another figure.

[Peyman Obeidy]

   function making_SliderForIm(ImCh1,BWCh1)

global I 
global Imask

Imask=BWCh1;
I=ImCh1;
imshow(I,[]);

%create a slider
sld=uicontrol('Style', 'slider',...
    'Min',1,'Max',50,'Value',41,...
    'Position', [400 20 120 20],...
    'Callback', @SliderVal);

      function SliderVal(source,event)
          val=ceil(source.Value);

% Display segmented image
BWsIbf = activecontour(I,Imask, 1+val, 'edge');

      [B,L] = bwboundaries(BWsIbf,'noholes');
    imshow(I,[]);%label2rgb(L, @jet, [.5 .5 .5]))
     hold on
     for k = 1:length(B)
        boundary = B{k};
       plot(boundary(:,2), boundary(:,1), 'r', 'LineWidth', 2);
     end
      end
   end

Answer 1

[Peyman Obeidy]

The final code is provided here:

https://au.mathworks.com/matlabcentral/answers/332877-update-image-in-gui-without-guide