MATLAB: Rename jpg files in a folder

rename

I need some help here,

So I have like 200 Images with the name of 1 2 3 4 … n

Ineed the file to be renamed as 001 002 …. 012… 034 …. 180 … 200

How to do that?

Thanks,

Best Answer

Try this:

folder = pwd; % Wherever your input images are stored.
outputFolder = fullfile(folder, '/renamed'); % Can be the same as the input folder if you want.
% Make output folder if it exists.
if ~isfolder(outputFolder)
	mkdir(outputFolder)
end
fileList = dir('*.bmp')
% Loop over all files.
for k = 1 : length(fileList)
	% Get this filename.
	thisFileName = fullfile(fileList(k).folder, fileList(k).name);
	% Find out just the base filename without the folder.
	[~, baseFileNameNoExt, ext] = fileparts(thisFileName);
	number = str2double(baseFileNameNoExt);
	% Skip non-numbers
	if isnan(number)
		continue;
	end
	fprintf('Processing %s...\n', thisFileName);
	
	% Optionally display the image
% 	% Read in the input image.
% 	originalImage = imread(thisFileName);
% 	% Display it.
% 	imshow(originalImage);
% 	drawnow;
	% Create the new base filename without the folder.
	baseOutputFileName = sprintf('%3.3d%s', number, ext);
	% Create output image filename....
	fprintf('   Renaming to %s to %s...\n', baseFileNameNoExt, baseOutputFileName);
	% Create the output filename which will be in the output folder.
	outputFileName = fullfile(outputFolder, baseOutputFileName);
 	movefile(thisFileName, outputFileName); % or imwrite()
end
message = sprintf('Done processing %d images', length(fileList))
uiwait(helpdlg(message));

If you want to save the renamed files in a different folder, use imwrite(), otherwise if you want to rename in the same folder use movefile().

Related Solutions

MATLAB: Open a series of images and save them in another folder

See http://www.mathworks.com/matlabcentral/answers/13205#answer_18099 to format your code.

See the FAQ to process a sequence of images: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

You need to have two folder variables, one for input, and one for output. And you need two base file names, one for input and one for output. Then use full file to create two filenames:

fullInputFileName = fullfile(inputFolder, baseInputFileName);
fullOutputFileName = fullfile(outputFolder, baseOutputFileName);

baseInputFileName would be files(k).name.

See full demo below:

% Copies all the files from one folder to another folder.
clc;    % Clear the command window.
workspace;  % Make sure the workspace panel is showing.
format compact;
% Define input and output folders.
% CHANGE THESE FOLDER NAMES!!!!!!
inputFolder = pwd;
outputFolder = uigetdir(pwd);
if strcmp(outputFolder, inputFolder)
  errorMessage = sprintf('Error: the output folder must be different than the input folder');
  uiwait(warndlg(errorMessage));
  return;
end
% Check to see that both folders exist.
if ~isdir(inputFolder)
  errorMessage = sprintf('Error: The following input folder does not exist:\n%s', inputFolder);
  uiwait(warndlg(errorMessage));
  return;
end
if ~isdir(outputFolder)
  errorMessage = sprintf('Error: The following output folder does not exist:\n%s', outputFolder);
  uiwait(warndlg(errorMessage));
  return;
end
% Get a list of files to copy.
filePattern = fullfile(inputFolder, '*.*'); % All files.
% filePattern = fullfile(inputFolder, '*.m'); % m-files.
fileNamesToTransfer = dir(filePattern);
numFiles = length(fileNamesToTransfer);
% Do the copying.
for k = 1 : numFiles
  % Get the base file name.
  baseFileName = fileNamesToTransfer(k).name;
  % Create the full input and output filenames.
  fullInputFileName = fullfile(inputFolder, baseFileName);
  fullOutputFileName = fullfile(outputFolder, baseFileName);
  fprintf(1, 'Now copying file #%d of %d: %s to %s\n', ...
    k, numFiles, fullInputFileName, fullOutputFileName);
  copyfile(fullInputFileName, fullOutputFileName);
end
msgbox('Done copy files!', 'modal');

MATLAB: I have few images, i want to create folders, and names of folders should be identical to images. and want to save those images in folders having identical names.

Try this:

% Specify the folder where the files live.
myFolder = 'D:\My Pictures\Misc'; % Wherever...
% Check to make sure that folder actually exists.  Warn user if it doesn't.
if ~isdir(myFolder)
  errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);
  uiwait(warndlg(errorMessage));
  return;
end
% Get a list of all files in the folder with the desired file name pattern.
filePattern = fullfile(myFolder, '*.PNG'); % Change to whatever pattern you need.
theFiles = dir(filePattern);
for k = 1 : length(theFiles)
  baseFileName = theFiles(k).name;
  fullFileName = fullfile(myFolder, baseFileName);
  fprintf(1, 'Now reading %s\n', fullFileName);
  % Now do whatever you want with this file name,
  % such as reading it in as an image array with imread()
  imageArray = imread(fullFileName);
  imshow(imageArray);  % Display image.
  drawnow; % Force display to update immediately.
  % Create a folder with the base file name
  [~, baseFileNameNoExt, ~] = fileparts(baseFileName);
  outputFolder = fullfile(myFolder, baseFileNameNoExt);
  if ~exist(outputFolder, 'dir')
    mkdir(outputFolder);
    fprintf('Created folder : %s\n', outputFolder);
  end
  % Prepare output filename
  outputFileName = fullfile(outputFolder, baseFileName);
  % Copy file to that folder
  copyfile(fullFileName, outputFileName);
  fprintf('    Copied %s to the folder called %s.\n', baseFileName, outputFolder);
end

Best Answer

Related Solutions

MATLAB: Open a series of images and save them in another folder

MATLAB: I have few images, i want to create folders, and names of folders should be identical to images. and want to save those images in folders having identical names.

Related Question