CODEWITHSUNDEEP
imagematlabfile-io
E_learner
E_learner

Reputation: 3582

Matlab: Write Image Sequences into a Folder

I am trying to write a sequence of images into a folder using imwrite function in Matlab. I first crop the input image (inputImg) with a given matrix as cropMatrix, then save those resulted images in order to a folder. My code for it is as follows: 

for i = 1:n
    img = imcrop(inputImg,cropMatrix);
    fileName = sprintf('C:\Users\King_Knight\Desktop\Images\%02d',i);
    imwrite ( img, 'fileName', 'jpg');
end

Then the folder is totally empty, it didn't write out anything, besides I got a warning message in the Matlab workspace saying:

Warning: Escape sequence '\U' is not valid. See 'help sprintf' for valid escape sequences.

I've searched the internet, but still couldn't solve it. Could someone help? Thanks.

Upvotes: 0

Views: 4212

Answers (3)

user3428358
user3428358

Reputation: 11

If you want to write the image into destination folder use the following code in MATLAB.

destinationFolder = 'C:\Users\Deepa\Desktop\imagefolder'; % Your folder path
if ~exist(destinationFolder, 'dir')
  mkdir(destinationFolder);
end
baseFileName = sprintf('%d.png', i); % e.g. "1.png"
fullFileName = fullfile(destinationFolder, baseFileName); 
imwrite(img, fullFileName); % img respresents input image.

I hope this answer might help someone.

Upvotes: 0

Sujan Chowdhury
Sujan Chowdhury

Reputation: 11

clear all;
%%%% Image Read
%%

input_folder  = '..'; %  Enter name of folder from which you want to upload pictures with full path
output_folder = '..';
filenames = dir(fullfile(input_folder, '*.jpg'));  % read all images with specified extention, its jpg in our case
total_images = numel(filenames);    % count total number of photos present in that folder
Outputs=total_images;
dir=output_folder;

%%

%%
for i = 1:total_images
    full_name= fullfile(input_folder, filenames(i).name);     % it will specify images names with full path and extension
    our_images = imread(full_name);                           % Read images  
    figure (i);                                               % used tat index n so old figures are not over written by new new figures
    imshow(our_images);                                       % Show all images 
    I = our_images;
    I = imresize(I, [384  384]);   

   filename = [sprintf('%03d',i) '.jpg'];
   fullname = fullfile(output_folder,'output_folder',filename);
   imwrite(I,fullname)    % Write out to a JPEG file (img1.jpg, img2.jpg, etc.)


end

%%

Upvotes: 1

devrobf
devrobf

Reputation: 7213

The *printf set of functions in Matlab will interpret C-style escape codes, which always start with the character \. A common problem is of course that Windows uses the backslash as a directory separator.

The simple solution is the escape all of the backslashes using \\. For example:

fileName = sprintf('C:\\Users\\King_Knight\\Desktop\\Images\\%02d',i);

will actually create the string C:\Users\King_Knight\Desktop\Images\00, as required.

You can read the relevant documentation here.

Note that in Matlab, unlike C, this only applies to the functions fprintf, sprintf etc. You don't have to do it for other functions such as disp.

Upvotes: 2

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