MATLAB: How do i randomly show the pictures i have in the array

random pics matlab

this is my code:

folder = 'F:\school\matlab\project\pictures\pictures alone'
filePattern = fullfile(folder, 'apple.jpg','condor.jpg','elephant.jpg',...
    'Koala.jpg','orange.jpg','whale.jpg','Penguins.jpg');

i would like to use imshow() to show the pictures but i want it to show random pictures from the filePattern i declared above… can anyone please help me with this?

i am using matlab R2013a

Best Answer

Your usage of fullfile is incorrect. The arguments you pass except for the last should be folder.

There are many ways to do what you want. The gist of it is to store your options in a cell array and choose an element at random with any of the random functions, randi for example. Or just reorder the array with randperm.

folder = 'F:\school\matlab\project\pictures\pictures alone';
files = {'apple.jpg','condor.jpg','elephant.jpg',...
  'Koala.jpg','orange.jpg','whale.jpg','Penguins.jpg'};
%pick one at random and show:
imshow(fullfile(folder, files{randi(numel(files))}));
pause(5)
%pick another at random, it may be the same
imshow(fullfile(folder, files{randi(numel(files))}));
%reorder the array randomly:
randomisedfiles = files(randperm(numel(files)));
%etc.

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MATLAB: How to link a word or group of words to a ” *.jpg” picture.

This is a copy of the answer I wrote in the comment to my answer of your other question:

It sounds like you're after a method of tagging pictures and retrieving / searching these tags.

This is normally done with a database or some data structures that are not available in matlab (e.g. multi-index container). In matlab, what I would do is use a map.

If you wanted to make it easy to find images associated with a certain tag, the tags would be the keys, the images associated with the tag, the values, would be a cell array:

keys = {'fruits', 'animals', 'apples', 'birds'};
values = {{'apple.jpg', 'orange.jpg'}, {'condor.jpg', 'elephant.jpg', 'koala.jpg', 'whale.jpg', 'penguins.jpg'}, {'apple.jpg'}, {'condor.jpg', 'penguins.jpg}};
tagimages = containers.Map(keys, values);
%find images of birds:
birdimages = tagimages('birds')
%add a tag:
tagimages('Four legged') = {'elephant.jpg', 'koala.jpg'}

The issue with the above is that you duplicate the image strings a lot in the map (that can be worked around by storing indices to the cell array of filenames instead) and finding the tags associated with one image is not easy. Matlab unfortunately does not have a great deal of containers. To get something better, you'd have to use the database toolbox.

If what you want to do predominantly is find tags associated with an image, then you make the images the keys, and the tags the values:

keys = {'apple.jpg', 'orange.jpg', 'condor.jpg', 'elephant.jpg', 'koala.jpg', 'whale.jpg', 'penguins.jpg'};
values = {'fruit', 'apple'}, {'fruit'}, {'animal', 'bird'}, {'animal'}, {'animal'}, {'animal'}, {'animal', 'bird'}};
imagetags  = containers.Map(keys, values);
appletags = imagetags('apple.jpg')

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Best Answer

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MATLAB: How to link a word or group of words to a ” *.jpg” picture.

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