How to open tiff stack images in for loop

I have a folder F. Under that folder, I have 20 multipage stack .tiff image.

Each image A in the folder F is a stack of 50images and I need to average those 50images to get only one image B and do the average over the rows of image B then save the mean in an excel file. Here is my code

    myexcel = 'F\interference2.xlsx';
out = zeros(1280,20); 
for k = 1:20
    fname = ['F\image',num2str(k),'.tiff'];
    info = imfinfo(fname);
    num_images = numel(info); %50images
    Z = zeros(1024,1280);
    for jj = 1:num_images
        Z = Z + double(imread(fname, jj, 'Info', info)); %sum of the 50images
    end
    avrg = mean(Z/50); %average 
    out(:,k) = avrg;  % store a column in a matrix out
end
xlswrite(myexcel ,out)

It always gives an error: Error using imfinfo (line 100) Unable to open file "F\image1.tiff" for reading.

Error in interf (line 13) info = imfinfo(fname);

Thanks for your help.

Answer 1

[Jan]

The error message means, that the file cannot be opened. Most likely it does not even exist, because the path is wrong. Use an absolute path instead:

folder = 'C:\Temp\Your\Folder';
...
  fname = fullfile(folder, sprintf('image%d.tiff', k));