read all images from subfolders

hi.i have a folder with subfolders that each folder contains ten folder and these folders have 4 image files. how can resize all images with matlab code?

Answer 1

[Image Analyst]

Combine the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F with imresize() and you can do it. Create two filenames with sprintf() and fullfile(). Call imread() then imresize() then imwrite(). If you cannot do that, then post your code for us to fix.

[fereshte]

my code is:

clear all;

close all;

clc;

myFolder = 'C:\Users\Zare\Downloads\Compressed\Gait and Footprint\Footprint';

if ~isdir(myFolder)

errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);

uiwait(warndlg(errorMessage));

return;

end

filePattern = fullfile(myFolder, '*.bmp');

bmpFiles = dir(filePattern);

for k = 1:numel(bmpFiles)

A = imread(bmpFiles(k).name);

A3=imresize(A,[100,50]);

imwrite(A3,['C:\Users\Zare\Downloads\Compressed\Gait and Footprint\Footprint\Cropped\'bmpFiles(k).name],'bmp');

end

error is:

??? Error: File: resize.m Line: 16 Column: 87 Unexpected MATLAB expression.

[fereshte]

 dear Image Analyst

can you help me?

[Image Analyst]

Try this:

inputFolder = 'C:\Users\Zare\Downloads\Compressed\Gait and Footprint\Footprint';
if ~exist(inputFolder, 'dir')  
  errorMessage = sprintf('Error: The following folder does not exist:\n%s', inputFolder);  
  uiwait(warndlg(errorMessage));  
  return;  
end
filePattern = fullfile(inputFolder, '*.bmp');
bmpFiles = dir(filePattern);
outputFolder = 'C:\Users\Zare\Downloads\Compressed\Gait and Footprint\Footprint\resized\';
if ~exist(outputFolder, 'dir')
  mkdir(outputFolder);
end
for k = 1:numel(bmpFiles)
  fullInputFileName = fullfile(inputFolder, bmpFiles(k).name);
  originalImage = imread(fullInputFileName);  
  fullOutputFileName = fullfile(outputFolder, bmpFiles(k).name);
  outputImage = imresize(originalImage, [100,50]);  
  imwrite(outputImage, fullOutputFileName);  
end

[fereshte]

thanks but i get this error:

??? Undefined function or method 'mkrid' for input arguments of type 'char'.

Error in ==> pixel at 11 mkrid(outputFolder);

[Image Analyst]

use mkdir() to make a directory.

[fereshte]

??? Error using ==> mkdir Not enough input arguments.

Error in ==> resize at 11 mkdir();

how correct it?

[Image Analyst]

Make sure outputFolder has a value and is not empty.

[fereshte]

outputFolder is empty

[Image Analyst]

And why is it empty? Did you not have this line in there like I did:

outputFolder = 'C:\Users\Zare\Downloads\Compressed\Gait and Footprint\Footprint\resized\';

[fereshte]

i have this line in my code.i dont know why empty

[Image Analyst]

Well figure it out. Step through one line at a time until you see the value of it vanish. See http://blogs.mathworks.com/videos/2012/07/03/debugging-in-matlab/

In the meantime, I attach a program to recurse into subfolders getting image names.

[fereshte]

ok.thanks a lot