Display a set of random images in one out of 4 specific coordinates

Hello everyone,

I am actually working on a task where I want to show images in random order and individually in one of the four quadrants of the screendisplay (so 4 specific coordinates).

I can already display the images in one coordinate but I havent been able to switch from one quadrant to the other for each image.

This is the code that I have so far:

% Get a list of all files in the folder with the desired file name pattern.
filePattern = fullfile(Matlabimagetrial, '*.jpg'); % Change to whatever pattern you need.
theFiles = dir(filePattern);
% Randomize the order
sortOrder = randperm(length(theFiles));
theFiles = theFiles(sortOrder);
for k = 1 : length(theFiles)
  baseFileName = theFiles(k).name;
  fullFileName = fullfile(Matlabimagetrial, baseFileName);
  fprintf(1, 'Now reading %s\n', fullFileName);
 % Try to show this file by showing in a specific quadrant,
   for x=0:0;y=0:0;
plot(x,y);grid on;
set(gca,'XLim',[-20 20]);
set(gca,'YLim',[-20 20]);
   end 
hold on
data=imread(fullFileName);

image(flipud(data), 'XData', [0 20], 'YData', [0 20]); %Define the coordinates in which you want your image to appear
    pause(5);   % Time for which the image is displayed (we can change it as we wish)
    set(gcf,'Visible','off');
    set(gcf,'Visible','on');
 end

[Johannes Hougaard]

I'm not sure I fully understand your issue...but here's a guess

If you define your figure before your image and use the subplot function it might work.

% Get a list of all files in the folder with the desired file name pattern.
filePattern = fullfile(Matlabimagetrial, '*.jpg'); % Change to whatever pattern you need.
theFiles = dir(filePattern);
% Randomize the order
sortOrder = randperm(length(theFiles));
theFiles = theFiles(sortOrder);
fh = figure; % Define the figure you want to use
fh.WindowState = 'maximized'; % Maximize the window to fill the entire screen
for k = 24:32
    
    clf(fh); % If you wish to show only one image at a time and not fill all four positions
    baseFileName = theFiles(k).name;
    fullFileName = fullfile(Matlabimagetrial, baseFileName);
    fprintf(1, 'Now reading %s\n', fullFileName);
    data=imread(fullFileName);
    
    plotno = randperm(4,1);
    ah = subplot(2,2,plotno);
    try
    image(ah,data);
    end
    ah.YAxis.Visible = 'off';
    ah.XAxis.Visible = 'off';

    drawnow
    pause(5);
end

[Johannes Hougaard]

Or if what you desire is to move your figure to a differente position for each image you could use

% Get a list of all files in the folder with the desired file name pattern.
filePattern = fullfile(Matlabimagetrial, '*.jpg'); % Change to whatever pattern you need.
theFiles = dir(filePattern);
% Randomize the order
sortOrder = randperm(length(theFiles));
theFiles = theFiles(sortOrder);

fh = figure; % Define the figure you want to use
ah = axes(fh);
positions = {[44 525] [44 40] [1110 40] [1110 525]};

for k = 24:32
    
    cla(ah);
    baseFileName = theFiles(k).name;
    fullFileName = fullfile(Matlabimagetrial, baseFileName);
    fprintf(1, 'Now reading %s\n', fullFileName);
    data=imread(fullFileName);
    
    plotno = randperm(4,1);
    
    try % I had some images that couldn't be displayed so had to add an ugly 'try'
    image(data);
    end
    ah.YAxis.Visible = 'off';
    ah.XAxis.Visible = 'off';
    fh.Position(1:2) = positions{plotno};

    drawnow
    pause(5);
end

[Nicolas Vetter]

This exactly what I was trying to do.

I didn't know the plotno function.

Thanks a lot

PS I'll accept this answer if you put it as an answer, for the script where you can move the figure to a different position for each image

[Johannes Hougaard]

plotno is not a function :)

It's just a variable I used to index randomly into the positions cell array.

I'll post as an answer.

[Nicolas Vetter]

Sorry I meant randperm so the function associated to plotno

Answer 1

[Johannes Hougaard]

As described in my comment this should do the trick by storing your four coordinate sets in the cell array positions and indexing using the randperm function with inputs (4,1).

% Get a list of all files in the folder with the desired file name pattern.
filePattern = fullfile(Matlabimagetrial, '*.jpg'); % Change to whatever pattern you need.
theFiles = dir(filePattern);
% Randomize the order
sortOrder = randperm(length(theFiles));
theFiles = theFiles(sortOrder);
fh = figure; % Define the figure you want to use
ah = axes(fh); % Define the axes in the figure to allow handling of axis visibility in the loop
positions = {[44 525] [44 40] [1110 40] [1110 525]};
for k = 1:length(theFiles)
    
    cla(ah); % clearing the axes
    baseFileName = theFiles(k).name;
    fullFileName = fullfile(Matlabimagetrial, baseFileName);
    fprintf(1, 'Now reading %s\n', fullFileName);
    data=imread(fullFileName);
    
    plotno = randperm(4,1);
        
    image(ah,data);
    ah.YAxis.Visible = 'off';
    ah.XAxis.Visible = 'off';
    fh.Position(1:2) = positions{plotno};
    drawnow % needed to show the image in the loop.
    pause(5);
end