MATLAB: Display random image on axes

imagerandom image

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

Best Answer

   %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.

Related Solutions

MATLAB: Get path to all files in a folder of images

% Directory
directory = 'C:\Datasets\nyu\train\';
img_dir = fullfile(directory, 'image_02');
depth_dir = fullfile(directory, 'depth');
image_rgb_info  = dir( fullfile(img_dir, '*.jpg'));
image_rgb_filenames = fullfile(img_dir, {image_rgb_info.name} );
image_depth_info = dir( fullfile(depth_dir, '*.png'));
image_depth_filenames = fullfile(depth_dir, {image_depth_info.name} );

MATLAB: Is there a simple way to obtain a table with the number of pixels for each image in a folder

No.

projectdir = 'C:\Where\The\Folder\is';
dinfo = dir( fullfile(projectdir, '*.jpg') );
num_img = length(dinfo);
img_files = {dinfo.name};
full_names = fullfile( projectdir, img_files );
img_titles = cell(num_img, 1);
num_pixel = zeros(num_img, 1);
for K = 1 : num_img
  [~, img_titles{K}, ~] = fileparts( img_files{K} );
  stats = imfinfo( full_names{K} );
  num_pixel(K) = stats.Width * stats.Height;
end
result = table(img_titles, num_pixel, 'VariableNames', {'Title', 'NumberOfPixels'});

Best Answer

Related Solutions

MATLAB: Get path to all files in a folder of images

MATLAB: Is there a simple way to obtain a table with the number of pixels for each image in a folder

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