how to get image from specific folder and resize each image and save them is a new folder

i try below code, but it show error at 'thisimage' variable. whats the problem.

clc;
close all;
clear;

OutputFolder = 'D:\Datasets\handwritten-signatures\sample_Signature\edited';  % Set as needed [EDITED]
dinfo = dir('D:\Datasets\handwritten-signatures\sample_Signature\genuine\*.png');% image extension
for K = 1 : length(dinfo)
  thisimage = dinfo(K).name;
  Img   = imread(thisimage);
  Y     = imshow(Img);
  Gray  = rgb2gray(Img);
  i = imresize(Img, [227, 227], 'bilinear');
  imwrite(i, fullfile(OutputFolder, thisimage));  % [EDITED]
end

[Jan]

"it show error at 'thisimage' variable" - please post the complete error message. For solving a problem it is important to know, what the problem is.

[Awais Khan]

Error using imread>get_full_filename (line 516)
File "NFI-00101001.png" does not exist.

Error in imread (line 340)
    fullname = get_full_filename(filename);

Error in resizing_dataset_images (line 9)
  Img   = imread(thisimage);

above error show as a result of above provide code. but in data set file with this name exist.

Answer 1

[Murugan C]

HI,

Before reading the image (imread), you shoud change directory, where the files are present, as like as below

clc;
close all;
clear;
OutputFolder = 'D:\Datasets\handwritten-signatures\sample_Signature\edited';  % Set as needed [EDITED]
dinfo = dir('D:\Datasets\handwritten-signatures\sample_Signature\genuine\*.png');% image extension
for K = 1 : length(dinfo)
    thisimage = dinfo(K).name;
    cd 'D:\Datasets\handwritten-signatures\sample_Signature\genuine\'
    Img   = imread(thisimage);
    cd ..
    Y     = imshow(Img);
    Gray  = rgb2gray(Img);
    i = imresize(Img, [227, 227], 'bilinear');
    imwrite(i, fullfile(OutputFolder, thisimage));  % [EDITED]
end

[Murugan C]

Refer below link also.

https://in.mathworks.com/matlabcentral/answers/460320-how-to-change-image-format

[Rik]

You shouldn't be using cd in your functions. imread will accept a full path without requiring the current folder to be changed. Also, why are you using clc,close all,clear? Most of the times that is cargo cult programming. (and you should use the layout tools to make your code more readable)

Answer 2

[Rik]

This is how you can provide the full path to imread:

for K = 1 : length(dinfo)
  thisimage = dinfo(K).name;
  Img   = imread(fullfile(dinfo(K).folder,thisimage));
  Y     = imshow(Img);
  Gray  = rgb2gray(Img);
  i = imresize(Img, [227, 227], 'bilinear');
  imwrite(i, fullfile(OutputFolder, thisimage));
end