MATLAB: How do you save one or all the images from an array as .png files in a folder.

app designerarrayMATLAB

Hi, I have an array where there are 18 images stored making the array 18×4 double. I would like to be able to save these indivdual images in a folder. The number of images in the array will vary.

Is this possible? If so how can you do it?

Thank you

Best Answer

To save the images from an array as .png files in a folder, please see the below code.

a = [zeros(9,4); ones(9,4);];
numImages = size(a,1);
workingDir = 'C:\Desktop\Images';
mkdir(workingDir);
for i=1:numImages
   baseFileName = sprintf('image%d.png',i);
   fullFileName = fullfile(workingDir,'images',baseFileName);
   imwrite(a(i,:),fullFileName);
end

Make sure to save this .m file in the workingDir and create the folder 'images' in the workingDir before running the .m file.

Related Solutions

MATLAB: Reading image save as matrix and store filename information

You need to parse the filename with strfind() and str2double. Try this:

function test
clc;    % Clear the command window.
workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;
[imageType, pos, exposure] = ParseFileName('image_TM_pos13p72_exp2p456.jpg')
[imageType, pos, exposure] = ParseFileName('image_TE_pos12p56_exp2p800.jpg')
function [imageType, pos, exposure] = ParseFileName(filename)
  imageType = filename(7:8); % Extract TM or TE
  % Parse pos
  posLocation = strfind(filename, '_pos') + 4;
  posString = filename(posLocation:posLocation + 4);
  posString = strrep(posString, 'p', '.'); % Convert p to dot

  pos = str2double(posString);
  % Parse exposure
  expLocation = strfind(filename, '_exp') + 4;
  expString = filename(expLocation:expLocation + 4);
  expString = strrep(expString, 'p', '.'); % Convert p to dot
  exposure = str2double(expString);

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: Reading image save as matrix and store filename information

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.

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