How to save image using one pushbutton

i add noise in image at axes2, and then i want to save the image.can anyone help me?here is my code that i try

function checkbox1_Callback(hObject, eventdata, handles)
applyNoise(handles);
function applyNoise(handles)
if isfield(handles,'imgData')
 imgData = handles.imgData;
 noiseStr = '';
   if get(handles.checkbox1,'Value')
      noiseStr = 'Salt & pepper';
      JData = imnoise(imgData,'salt & pepper',0.3);
   end
   if get(handles.checkbox2,'Value')
      if ~isempty(noiseStr)
          noiseStr = [noiseStr ', '];
      end
      noiseStr = [noiseStr 'Gaussian'];
      JData = imnoise(imgData,'gaussian',0.1,0.1);
   end
    if get(handles.checkbox3,'Value')
      if ~isempty(noiseStr)
          noiseStr = [noiseStr ', '];
      end
      noiseStr = [noiseStr 'localvar'];
      JData = imnoise(imgData,'localvar',0.05*rand(size(imgData)));
    end
   if get(handles.checkbox4,'Value')
      if ~isempty(noiseStr)
          noiseStr = [noiseStr ', '];
      end
      noiseStr = [noiseStr 'poisson'];
      JData = imnoise(imgData,'poisson');
   end
   if get(handles.checkbox5,'Value')
      if ~isempty(noiseStr)
          noiseStr = [noiseStr ', '];
      end
      noiseStr = [noiseStr 'speckle'];
      JData = imnoise(imgData,'speckle', 0.3);
   end

     axes(handles.axes2);
     %imshow(imgData);
     imshow(JData)
     title(['Noise type: ' noiseStr,]);

    handles.JData = imgData;
    %save the handles data
    %guidata(hObject,handles);
end
if isfield(handles,'JData')
    imgData = handles.JData;
end

and here my save button

function pushbutton2_Callback(hObject, eventdata, handles)
if isfield(handles,'JData')
imgData = handles.JData;
%if isfield(handles,'imgData')
%imgData = handles.imgData;
[Save,savename] = uiputfile('*.jpg','save this file')
fname=fullfile(savename,Save);
imwrite(imgData,fname);  % where F is your image

end

Answer 1

[Image Analyst]

Change the declaration to return handles, like this

function handles = applyNoise(handles)

otherwise the changes you make to handles (like adding a field handles.JData) will never be seen by your other functions.

[amira fauzey]

i try to make changes to my code,certain noise that i apply to image and save it,i check on my folder it successfully save the image with noise ,and certain noise when i save it and check at my folder,it show ori image without noise.i dont know how to solve my problem.here is my code

[Image Analyst]

I'm traveling in Washington D.C. this week so I may not get to it, but attach your .fig file also so people can run your code.

[amira fauzey]

hello image analyst, i can save the image now. but right now i have problem to add filter

[Image Analyst]

I've read your comment/announcement.

[amira fauzey]

can you help me please.... i really dont know how to solve my problem.

[Walter Roberson]

You need to explain what your current problem is. What error message are you observing when you add a filter? What is your code for that section?

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

[amira fauzey]

i want to add filter after i save my image noise using pushbutton.this is the code for filter.if user uncheck the checkbox i want the image with noise remain in the axes.

function checkbox6_Callback(hObject, eventdata,  handles)
  global noiseImage
applyFilter(handles);
function applyFilter(handles)
if isfield(handles,'imgData')
imgData = handles.imgData;
filterStr = '';
if get(handles.checkbox6,'Value')
filterStr = 'Average';
imgData = filter2(fspecial('average',3),imgData)/255;
end 
if get(handles.checkbox7,'Value')
if ~isempty(filterStr)
filterStr = [filterStr ', '];
end
filterStr = [filterStr 'Median'];
imgData = medfilt2(imgData,[3 3]); 
end
axes(handles.axes3);
    noiseImage = imgData;
 imshow(imgData);
 title(['Filter: ' filterStr]);
end

i think maybe the problem is the line if isfield(handles,'imgData') seems like filter didnt pass through this line. I am not pretty sure , i dont know how to solve this problem. i attach my full coding too. i really hope that you can help me.

[Image Analyst]

If you want the noise image, you need to show it, not the median filtered image. You're filtering it and then assigning the smoothed, filtered image to the same variable, thus overwriting your original, noisy data. You need to assign it to a new variable. Like:

filteredImage = filter2(fspecial('average',3),imgData)/255;

[amira fauzey]

is it like this? i dont know if i'm doing it right

function checkbox6_Callback(hObject, eventdata, handles)
global noiseImage
%applyFilter(handles); 
%function applyFilter(handles)
if isfield(handles,'imgData')
 imgData = handles.imgData;
 noiseImage = handles.imgData;
 filterStr = '';
   if get(handles.checkbox6,'Value')
      filterStr = 'Average';
      filteredImage  = filter2(fspecial('average',3),imgData)/255; end
if get(handles.checkbox7,'Value')
   if ~isempty(filterStr)
          filterStr = [filterStr ', '];
   end
    filterStr = [filterStr 'Median'];
    filteredImage  = medfilt2(imgData,[3 3]); 
end
axes(handles.axes3);
% noiseImage = imgData;
imshow(noiseImage );
title(['Filter type: ' filterStr]);
end

when i unchecked the checkbox, i want the noise before i add filter remain,how to do it?

[Image Analyst]

Replace that with these 3 functions:

function checkbox6_Callback(hObject, eventdata, handles)
  CheckBoxClicked(handles);
  
function checkbox7_Callback(hObject, eventdata, handles)
  CheckBoxClicked(handles);
  
function CheckBoxClicked(handles)
global noiseImage
fontSize = 13;
% If noiseImage is not there, see if you can get it from handles.
if isempty(noiseImage)
  if isfield(handles,'imgData')
    noiseImage = handles.imgData;
  else
    warningMessage = sprintf('WARNING: noiseImage not defined yet!');
    uiwait(warndlg(warningMessage));
    return;
  end
end
filterName = 'None';
% Initialize to original, noisy image.
% If no checkboxes are checked, this is what will display.
filteredImage = noiseImage;
% Now examine checkboxes to see if they want one of the filters.
if get(handles.checkbox6,'Value')
  % Checkbox 6 is checked so do an average.
  filterName = 'Average';
  kernel = ones(3)/9;
  filteredImage  = conv2(double(noiseImage), kernel, 'same');
elseif get(handles.checkbox7,'Value')
  % Checkbox 7 is checked so do a median filter.
  filterName = 'Median';
  filteredImage  = medfilt2(noiseImage, [3, 3]);
end
axes(handles.axes3);
imshow(filteredImage, []);
caption = sprintf('Filter type = %s', filterName);
title(caption, 'FontSize', fontSize);

If you're using "end" to finish off your function definitions, then add ends. It's optional but if you do it for one function you need to do it for all of them. They either all have ends or they all do not have ends. You can't mix styles.

[amira fauzey]

thank you so much image analyst, result come correctly

[amira fauzey]

how to make user can add more then one filter at a time?

[Image Analyst]

Replace the if/elseif construct with a bunch of separate if's. That way it can do more than 1. But I hope you know that filters are not commutative. Filtering an image with filter1 followed by filter2 will give a different image than filtering first with filter2, then filter1.

[amira fauzey]

if get(handles.checkbox6,'Value')
  % Checkbox 6 is checked so do an average.
  filterName = 'Average';
  kernel = ones(3)/9;
  filteredImage  = conv2(double(noiseImage), kernel, 'same');
end
if get(handles.checkbox7,'Value')
  % Checkbox 7 is checked so do a median filter.
  filterName = 'Median';
  filteredImage  = medfilt2(noiseImage, [3, 3]);
end

is it like this?

[Image Analyst]

No. And it would depend it you want to keep separate output images, or if you want them to be cascaded, like the output of one filter goes into the input of the other filter.

[amira fauzey]

i want it to be cascaded,like you said output of one filter goes into the input of the other filter.Like the combination of filters applied in the same noise image.after user click the checkboxes at the top of the image, it will show title of the combine filters.for example, Filter type = Average,Median

[Walter Roberson]

filteredImage = double(noiseImage);
applied_filters = {'Noise'};

if get(handles.checkbox6,'Value')
  % Checkbox 6 is checked so do an average.
  filterName = 'Average';
  kernel = ones(3)/9;
  filteredImage  = conv2(filteredImage, kernel, 'same');
      applied_filters{end+1} = 'Average';
end
if get(handles.checkbox7,'Value')
  % Checkbox 7 is checked so do a median filter.
  filterName = 'Median';
  filteredImage  = medfilt2(filteredImage, [3, 3]);
      applied_filters{end+1} = 'Median';
end

imshow(filteredImage, 'Parent', handles.axes3);

filt_list = strjoin(applied_filters, ', ');
title(filt_list, 'Parent', handles.axes3);

[amira fauzey]

when i click the checkboxes, axes3 become white blank, and i get an error ??? Undefined function or method 'strjoin' for input arguments of type 'cell'.

[amira fauzey]

i have edited the code to this,i change strjoin to horzcat

filteredImage = double(noiseImage);
applied_filters = {'Filter'};
if get(handles.checkbox6,'Value')
  % Checkbox 6 is checked so do an average.
  filterName = 'Average';
  kernel = ones(3)/9;
  filteredImage  = conv2(double(noiseImage), kernel, 'same');
    applied_filters{end+1} = 'Average';
end
if get(handles.checkbox7,'Value')
  % Checkbox 7 is checked so do a median filter.
  filterName = 'Median';
  filteredImage  = medfilt2(noiseImage, [3, 3]);
    applied_filters{end+1} = 'Median';
end
axes(handles.axes3);
imshow(filteredImage, []);
filt_list =  horzcat(applied_filters, ', ');
title(filt_list, 'Parent', handles.axes3);

not sure if correct, when i add two filter it look like it does reduce the noise.

[Walter Roberson]

strjoin was introduced in R2013a . You can use

filt_list = sprintf('%s, ', applied_filters{:});
filt_list = filt_list(1:end-2);  %trim off final ', '

[Image Analyst]

OK, so are we done now? Just recall what I said about the order of the filters being applied makes a big difference!

[amira fauzey]

It's okay now, thanks sir :)