How to create a session for images using matlab 2013a

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Maruthi Maruthi 2017-3-16

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https://ww2.mathworks.cn/matlabcentral/answers/330160-how-to-create-a-session-for-images-using-matlab-2013a

评论： Maruthi Maruthi 2017-3-18

Sir, I need a help regarding how to store images using matlab 2013a. In my page, I'm going to select images and I cropped that images and I stored those images in a folder for one user. In my case , I can crop images and successfully store images in a folder but when multiple users login and crop their images and stored it. Please help me about how can store images for different users while logging in.

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Adam 2017-3-16

Don't your users just select a folder to save to as with most windows applications that allow saving?

Maruthi Maruthi 2017-3-17

My page having cropped images and these images maintains a separate folder for each user. How can I place cropped images separately for each user... Please help me... This is required for my project...

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Answer 1

John D'Errico 2017-3-16

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This just seems to be a question of good programming design, best done in advance. Think about the needs for your code. If one such need is that each user has their own special place, then when they access the tool, you have them indicate where that will be. If they need to "login" to use this gui, then that tells you who the user is.

Probably easiest is to just define a database of users, which you could store in a .mat file. It would include any such information about where they wanted files stored. Then just update that file as necessary.

Or, you could probably store any user specific information using the preferences tools in MATLAB.

help setpref
help getpref

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Maruthi Maruthi 2017-3-17

Please give me more details..I was the beginner to MATLAB

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Answer 2

Walter Roberson 2017-3-17

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https://ww2.mathworks.cn/matlabcentral/answers/330160-how-to-create-a-session-for-images-using-matlab-2013a#answer_259133

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function name = whoami
   if ispc() 
     name = getenv('USERNAME');
    else 
      name = getenv('USER') ;
    end

You can now use the returned string as the folder name within some constant project folder. Watch out as you will want new users to be able to create the appropriate folder at need, which requires that everyone has write access to the project folder. But then that is a risk because people could potentially remove other people's work.

More common would be to save the files in a directory owned by the user. On pc you can use the Windows environment variables to figure out an appropriate location; on osx or Linux you can use the HOME environment variable.

Or you could use uigetdir() to allow the user to indicate which directory they want to use.

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Maruthi Maruthi 2017-3-18

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In the above code, I used code for cropped images for single user. I want this code for many users and maintain cropped images separately for each user but how? Please give me the code for that and am applying this code for login phase. At the registration phase, the login phase, user has to select images among the set and cropped that particular images as many times as he want and store images in a folder . while at the login phase, he has to select same cropped images that should match with already cropped images. Please help me for that... Sir, please help me regarding that.......... function ImagesExample() %# read images in a cell array imgs = cell(6,1); for i=1:6 imgs{i} = imread( sprintf('C:/Users/maruthi1/Documents/MATLAB/images3/ma3%1d.jpg',i) ); end

    %# show them in subplots
    figure(1)
    for i=1:6
        subplot(2,3,i);
        h = imshow(imgs{i}, 'InitialMag',200, 'Border','tight');
        title(num2str(i))
        set(h, 'ButtonDownFcn',{@callback,i})
    end
function callback(o,e,idx)
        %# show selected image in a new figure
        figure(2), imshow(imgs{idx})
                 title(num2str(idx))
         promptMessage = sprintf('Drag out a box that you want to copy,\nor Cancel to abort processing?');
titleBarCaption = 'Continue?';
button = questdlg(promptMessage, titleBarCaption, 'Continue', 'Cancel', 'Continue');
if strcmpi(button, 'Cancel')
  return;
end
A=imgs{idx};
n = input('Please enter the number of scenes you wish to crop: ')
ii=1;
%im_cropped = imcrop(A);
 %B=imgs{idx};
 %im_cropped = imcrop(B);
 %C=imgs{idx};
while (ii<4)

%[im_cropped rect] = imcrop(A);

im_cropped{ii} = imcrop(imgs{idx});

   filename = ['images3\images_cropped\trial' num2str(ii) '.jpg'];
   imwrite(im_cropped{ii},filename);

ii=ii+1; end promptMessage = sprintf('Your cropped images saved successfully'); titleBarCaption = 'Continue?'; button = questdlg(promptMessage, titleBarCaption, 'Continue', 'Cancel', 'Continue'); if strcmpi(button, 'Cancel') return; end end %croping(A); end

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