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read all images from subfolders

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fereshte 2014-5-21

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评论： fereshte 2014-5-24

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?

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Image Analyst 2014-5-21

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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.

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fereshte 2014-5-22

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编辑：fereshte 2014-5-22

在 MATLAB Online 中打开

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 2014-5-23

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在 MATLAB Online 中打开

dear Image Analyst

can you help me?

Image Analyst 2014-5-23

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编辑：Image Analyst 2014-5-23

在 MATLAB Online 中打开

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 2014-5-23

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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 2014-5-23

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use mkdir() to make a directory.

fereshte 2014-5-23

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

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

how correct it?

Image Analyst 2014-5-23

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Make sure outputFolder has a value and is not empty.

fereshte 2014-5-23

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编辑：fereshte 2014-5-23

outputFolder is empty

Image Analyst 2014-5-23

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在 MATLAB Online 中打开

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 2014-5-24

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

Image Analyst 2014-5-24

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recurse_subfolders.m

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 2014-5-24

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ok.thanks a lot

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read all images from subfolders

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