Display random image on axes

I have set of image in one folder. How can I display random image from a folder when i click on a pushbutton?

Answer 1

[Walter Roberson]

   %first you need to get the names of the images

   projectdir = '/homes/users/hani/MATLAB/plan9/images';        %set as appropriate

   img_exts = {'bmp', 'gif', 'jpg', 'png', 'tif'};      %list all the extensions you want to include

   dinfo = [];
   for K = 1 : length(img_exts)
     dinfo = vertcat(dinfo, ...
                     dir( fullfile(projectdir, ['*.', img_exts{K}]) ) );
   end

   %now pick one randomly

   randidx = randi( length(dinfo) );
   randomfile = fullfile( projectdir, dinfo(randidx).name );

   %read it
   imagedata = imread(randomfile);

   image(handles.TheDestinationAxes, imagedata);   %display it

You will find it more efficient to create dinfo only once and store the data somewhere to be used when the button is pushed.