Read, process and write image dataset

Hello, I have image dataset containing 5000 images. I enhanced the one image from this dataset in the matlab my code is working good and i got good result. Now i need help in processing this all 5000 images using my filter code and have to store that processed images in my laptop local folder. How to read, process and write 5000 images in one go. can anybody know how to do that?

[Rik]

You don't do it in one go: you use a loop.

doc dir
doc for
doc parfor %if you have the parallel computing toolbox

[Aravind Prabhu Gopala Krishnan]

Hello Rik thank you for your reply, actually i processed the 5000 images with my filter, its working great, now i need help in to store that processed 5000 images to my local machine(laptop). all images are of size 256x256 and png format.

[Rik]

What is your question exactly? You have a pipeline that works for 1 image, so what is exactly the problem in getting it to work for a list of files?

[Aravind Prabhu Gopala Krishnan]

I need help in storing my processed 5000 images to my laptop thats it bro.

[Rik]

What is your question? Weren't you already writing the result to local storage? How does your current pipeline look? It should start with a way to load an image, and it should end with writing that image to some storage. How are you doing that last step?

Bro.

Answer 1

[KSSV]

infolder = ''   % give the path of the folder where your images are present 
outfolder = ''   % give the path of the folder where you want to save images 
imgFiles = dir([infolder,filesep,'\*.png']) ;  % give extension of your images 
N = length(imgFiles) ;   % total images in the foder 
for i = 1:N
    thisFile = [infolder,filesep,imgFiles(i).name] ;   % each image file 
    [filepath,name,ext] = fileparts(thisFile) ;  % get name of the image file and extension 
    outFile = [outfolder,filesep,[name,ext]] ;   % write image file on this name here 
    I = imread(thisFile) ;   % read image into 
    % do what you want on I 
    imwrite(I,outFile) ;   % write the image in the said folder on the name 
end

[Aravind Prabhu Gopala Krishnan]

Thank you for your reply, what is that filesep?

[KSSV]

filesep

ans = '/'

[Aravind Prabhu Gopala Krishnan]

It worked thank you

[Raymond Norris]

One styllistic suggestion I have when using filesep, for example

[infolder,filesep,imgFiles(i).name]

is to write it instead with fullfile

fullfile(infolder,imgFiles(i).name)

[Aravind Prabhu Gopala Krishnan]

path = 'C:\Users\91894\Desktop\matlab\Dataset\images_001\images';
outfolder = 'C:\Users\91894\Desktop\matlab\Dataset\images_001\processed image';

img = imageDatastore(path,'IncludeSubfolders',1,'LabelSource','foldernames');
T = countEachLabel(img);
N = length(img.Files);

% i = readimage(img, 3000);
% imshow(i);
refback = zeros(25, 25);
for i = 1:N
    data = readimage(img,N);
    J = imresize(data,[256 256]);
    for f = 1:4
        SpatDog = fspecial('gaussian',25,0.732) - fspecial('gaussian',25,0.785);
        FreqDog = fftshift(fft2(fftshift(SpatDog)));
        Y = abs(FreqDog);
        refback = refback + im2double(Y);
    end
    refback = (1/4) * refback;
    Y = fftshift(ifft2(fftshift(refback)));
    
    conv = conv2(Y,J);
end

This is my code, ur code format is not fiiting for my project. Can you please tell me how to store my processed image, its in the variable name conv, i need to write that images in my local folder, thats all. I cannot process the filter with your code. i attacked my workspace too. In that am having my processed image in conv 280x280, i need to store that.

[KSSV]

Your code format is not fitting? Where did you try to fit? Show the complete code which you have tried and didnt let you fit.

[Aravind Prabhu Gopala Krishnan]

KSSV thanks for your help bro it worked actually after that.

Answer 2

[Rahil]

Updated version of code with example implementation

infolder = ''; %path to input folder
outfolder = ''; %path to output folder

if ~exist(outfolder, 'dir')
    mkdir(outfolder);
end

%replace image extension as required
imgFiles = dir(fullfile(infolder, '*.tiff'));
N = length(imgFiles);

for i = 1:N
    thisFile = fullfile(infolder, imgFiles(i).name);
    [~, name, ext] = fileparts(thisFile);
    outFile = fullfile(outfolder, [name ext]);
    
    %To read the file
    I = imread(thisFile);
    
    %Do your operation below
    if isa(I,'uint16')
        I = im2double(I);
        I = imnoise(I,'salt & pepper',0.02);
        I = im2uint16(I);
    else
        I = imnoise(I,'salt & pepper',0.02);
    end
    %------------------------
    
    %Writes the file to folder 
    imwrite(I, outFile);
end