I have a folder of binary images.I want to assign each image a variable so that it would be easy to extract features for the images.can someone please help me out?

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neha viswanath 2015-1-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/169570-i-have-a-folder-of-binary-images-i-want-to-assign-each-image-a-variable-so-that-it-would-be-easy-to

评论： Walter Roberson 2018-4-14

myFolder = 'e:\\invertedimages';
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:length(bmpFiles)
  baseFileName = bmpFiles(k).name;
  fullFileName = fullfile(myFolder, baseFileName);
  fprintf(1, 'Now reading %s\n', fullFileName);
  imageArray = imread(fullFileName);
  imshow(imageArray);  % Display image.
  drawnow; % Force display to update immediately.
end

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neha viswanath 2015-2-11

在 MATLAB Online 中打开

sir in the above code

if true
  baseFileName = bmpFiles(k).name;
end
what does .name for name of image or folder in which the image is or a predefined word.

Image Analyst 2015-2-11

在 MATLAB Online 中打开

Sorry - I evidently pasted the original code instead of the code I changed and tested. Try this:

myFolder = fileparts(which('cameraman.tif')); % Determine where demo folder is (works with all versions).
if ~isdir(myFolder)
  errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);
  uiwait(warndlg(errorMessage));
  return;
end
filePattern = fullfile(myFolder, '*.tif');
bmpFiles = dir(filePattern);
for k = 1:length(bmpFiles)
  baseFileName = bmpFiles(k).name;
  fullFileName = fullfile(myFolder, baseFileName);
  fprintf(1, 'Now reading %s\n', fullFileName);
  imageArray{k} = imread(fullFileName);
  imshow(imageArray{k});  % Display image.
  drawnow; % Force display to update immediately.
end

As to your latest question, bmpFiles is an array of structures. Each structure has several fields, one of which is name. So bmpFiles(k) is the k'th structure in the array and bmpFiles(k).name is the file name of the k'th image.

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采纳的回答

Stephen23 2015-1-11

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/169570-i-have-a-folder-of-binary-images-i-want-to-assign-each-image-a-variable-so-that-it-would-be-easy-to#answer_164584

To read multiple files in a loop:

http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

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Rene 2018-4-14

Uh, yes it should if you need to create a 4D array for training a neural network.

Walter Roberson 2018-4-14

No, if you need to create a 4D array for training a neural network, then you do not need a separate variable for each image. You can read an image into one variable, validate that the image is the right size and data type, and then store that variable as a slice of the 4D array (a second variable.) The loop index adds a third variable, the filename to read probably adds a 4th variable, for a total of 4 variables, not one variable per image.

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