MATLAB: How to access .jpg files from a folder and save names of .jpg files

fileimage processingimportloadMATLAB

I need to access a folder that contains multiple jpeg files. I now the name of the folder, but the jpeg files are randomly named so I need to find a way to figure out the names of the files so I can open them.

Thanks ahead for the help

Best Answer

FileList = dir(fullfile(FolderName, '*.jpg'));
File     = fullfile(FolderName, {FileList.name});

Now File is a cell string containing the absolute paths. You can open these files in a loop now.

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MATLAB: Conversion of .BMP to .jpg images

Sean, try this code:

% Demo to create JPG copies of BMP files in a different folder.
% By Image Analyst
% inputFolder = fileparts(which('cameraman.tif')) % Determine where demo folder is (works with all versions).
inputFolder = fullfile(pwd, 'Project\Matlab Folder\BMP Data');
filePattern = fullfile(inputFolder, '*.bmp')
% Get list of all BMP files in input folder
bmpFiles = dir(filePattern)
% Create the output folder:
outputFolder = fullfile(pwd, 'Project\Matlab Folder\JPEG Data')
if ~exist(outputFolder, 'dir')
  mkdir(outputFolder);
end
figure;
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
% Loop over all bmp files, making a jpg version 
% of them in the output folder.
for k = 1 : length(bmpFiles)
  % Read in .bmp file
  baseFileName = bmpFiles(k).name;
  fullFileNameInput = fullfile(inputFolder, baseFileName)
  rgbImage = imread(fullFileNameInput);
  subplot(1, 2, 1);
  imshow(rgbImage);
  title('Original image', 'FontSize', 30);
  drawnow;
  
  % Prepare output file name
  fullFileNameOutput = fullfile(outputFolder, baseFileName);
  % Converts to JPEG and gives it the .jpg extension
  fullFileNameOutput = strrep(lower(fullFileNameOutput), '.bmp', 'jpg')
  imwrite(rgbImage,fullFileNameOutput);
  % Reloads it in a JPEG format to see how bad the compression artifacts are.
  rgbImage = imread(fullFileNameOutput);
  subplot(1, 2, 2);
  imshow(rgbImage);
  title('Recalled JPG image', 'FontSize', 30);
  drawnow;
  pause(1);
end
% Open Windows Explorer to the output folder:
winopen(outputFolder);

MATLAB: How to rename files for many folders

This question is dicussed to death. Few useful links:

https://in.mathworks.com/matlabcentral/answers/1760-how-to-rename-a-bunch-of-files-in-a-folder

https://in.mathworks.com/matlabcentral/answers/144271-rename-a-bunch-of-files-in-a-folder

https://in.mathworks.com/matlabcentral/answers/12471-changing-the-names-of-text-files-in-a-directory

Best Answer

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MATLAB: Conversion of .BMP to .jpg images

MATLAB: How to rename files for many folders

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