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

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Nicolas Vetter 2022-4-25

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评论： Nicolas Vetter 2022-4-29

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

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Johannes Hougaard 2022-4-28

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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 2022-4-29

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 2022-4-29

Sorry I meant randperm so the function associated to plotno

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Answer 1

Johannes Hougaard 2022-4-29

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1704525-display-a-set-of-random-images-in-one-out-of-4-specific-coordinates#answer_953535

编辑：Johannes Hougaard 2022-4-29

在 MATLAB Online 中打开

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

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

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