imread file does not exist - Unable to read file with multiple images

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Vishnu Sree Shanthanu on 14 Mar 2024

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Edited: Walter Roberson on 14 Mar 2024

I am trying the following code which reads a file containing multiple images -

clc; clear all; 
% Specify the filename containing images
filename = 'D:\BMPtoPNG'
% Read all images from the file
images = imread(filename); ......

But the command prompt shows -

Error using imread

File "D:\BMPtoPNG" does not exist.

Please let me know how to solve this error.

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DGM on 14 Mar 2024

Edited: DGM on 14 Mar 2024

That's not how imread() works. If you want to read everything in a directory, you have to read each file individually.

https://www.mathworks.com/matlabcentral/answers/364209-how-to-read-all-types-images-from-the-folder-regardless-of-file-extension

https://www.mathworks.com/matlabcentral/answers/62399-how-to-load-multiple-images-and-processing-the

https://www.mathworks.com/matlabcentral/answers/320689-get-path-to-all-files-in-a-folder-of-images

https://www.mathworks.com/matlabcentral/answers/?search_origin=ans_leaf&term=read+images+folder

Stephen23 on 14 Mar 2024

https://www.mathworks.com/help/matlab/ref/matlab.io.datastore.imagedatastore.html

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Answer 1

Walter Roberson on 14 Mar 2024

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% Specify the filename containing images
foldername = 'D:\BMPtoPNG';
% Read all images from the file
dinfo = dir(foldername);
dinfo([dinfo.isfolder]) = [];   %get rid of all subfolders including . and ..
filenames = fullfile({dinfo.folder}, {dinfo.name});
nfile = numel(filenames);
images = cell(nfile,1);
for K = 1 : nfile
  this_image = imread(filenames{K});
  images{K} = this_image;
end
%now images is a cell array of image contents