How to read and display multiple images in matlab

Hi there

I'm trying to read an images from the folder using for loop but when i run the code it doesn't work

Here is my code:

folder='Documents/MATLAB/*.png' ;

I=dir(fullfile(folder,'*.png'));

for k=1:numel(I)

filename=fullfile(folder,I(k).name);

a=imread(filename);

end

Answer 1

[Adam]

http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

Your code is equivalent to:

fullfile( 'Documents/MATLAB/*.png', '*.png' );

which is clearly not going to resolve to something sensible. dir just needs a folder given to it, not filenames with extensions.

[Guillaume]

Well, actually in R2016b, the above would be a valid string to pass to dir. However, it is extremely unlikely to find anything and is most certainly not what is intended.

It would find all files and folders ending in .png in all immediate subfolders of Documents/MATLAB/ ending in .png. While windows allows dots in folder names, it's an unusual thing to do.

[Adam]

Useful to know. I've only used dir on folders so far!

Answer 2

[Thorsten]

Try

folder='Documents/MATLAB/';

Answer 3

[Image Analyst]

Like Adam said, see the FAQ for two code samples: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

A glaring problem with your code is the lack of any way to show/display the images. There is no imshow(a) in your loop. Other problems include no using "drawnow" to see the images after each one, otherwise you'll just see the last images. And using horrible variable names like the badly-named a.

See attached demo.