在Matlab中读取图像权限

Question

I'm trying to access images in a matlab interface my code is as follows:

global  im2 im  
axes(handles.axes4); 

[path1, user_cance]= imgetfile();
if user_cance 
    msgbox(sprintf('Error'), 'Error', 'Error'); 

    return
end

srcFiles = dir('C:\Users\User\Desktop\images test\yale faces\yalefaces\..');    
 % yale faces is the database folder 

for i = 1 : length(srcFiles)
    file_name=dir(strcat('C:\Users\User\Desktop\images test\yale faces\yalefaces')); 

  im2=imread(strcat('C:\Users\User\Desktop\images test\yale faces\yalefaces',file_name(i).name));  
    %processing of read image

end

the issue is that when I run the code, it gives the following error:

Can't open file "C:\\Users\\User\\Desktop\\images test\\yale faces\\yalefaces" for reading; you may not have read permission.

Does anyone know how to solve this issue?

Answer 1

When you do a directory listing (without any wildcards) you are going to get the current directory '.' and parent directory as well '..' . You can't read these like files because they are directories. You will need to filter out the directories prior to trying to read them with imread.

files = dir('C:\Users\User\Desktop\images test\yale faces\yalefaces'); 

% Remove directories
files = files(~[files.isdir]);

As a side note, it is very hard to tell what your code is doing, but I'm pretty sure it doesn't do what you hope.

It seems like you want to get all images within the database. If that's so, you'll want to do something like.

folder = 'C:\Users\User\Desktop\images test\yale faces\yalefaces';

% Get a list of all files in this folder
files = dir(folder);
files = files(~[files.isdir]);

for k = 1:numel(files)
    % Append the folder with the filename to get the path and load
    im2 = imread(fullfile(folder, files(k).name));
end

I highly discourage using strcat to construct file paths particularly because it removes trailing/leading whitespace from each input which can corrupt a filename. fullfile was designed for exactly this so please use that.