how i extract features from my image datastore?

hello everyone

i'm trying to extract logical binary pattern from image datastore

this my code

imds = imageDatastore(rootFolder, 'IncludeSubfolders',1 ,'LabelSource', 'foldernames');

% after that i want to read the first 10 image of each subfolder i haev use this programme

for k = 1 : 10

thisFullFileName = imds.Files{k};

fprintf('Reading in %s.\n', thisFullFileName);

thisImage = readimage(imds, k);

imshow(thisImage);

drawnow;

end

how i can used extractLBPFeatures to extract feature for each image from my imagedatastore

Answer 1

[Rahul]

Hi @youb mr,

As per the code shared by you, in order to 'extractLPBFeatures' from each image from your 'imageDatastore', the following additions can be added to your existing code:

• Since the function 'extractLPBFeatures' expects an image, it can be used directly in your loop after reading the image from the 'imagedatastore' using 'readImage' function.
• The extracted features can be stored in a cell array.

Hence your code can be adjusted in the following way:

imds = imageDatastore(rootFolder, 'IncludeSubfolders', true, 'LabelSource', 'foldernames');

% Initialize a cell array to store LBP features for each image
lbpFeaturesCell = cell(numel(imds.Files), 1); % Addition 1

for k = 1:numel(imds.Files)
    thisFullFileName = imds.Files{k};
    fprintf('Reading in %s.\n', thisFullFileName);
    thisImage = readimage(imds, k);
    imshow(thisImage);
    drawnow;
    
    % Extract and store LBP features- Addition 2
    lbpFeatures = extractLBPFeatures(thisImage);
    lbpFeaturesCell{k} = lbpFeatures;
end

The following MATLAB Answers mentions a detailed explanation of the specified additions:

https://www.mathworks.com/matlabcentral/answers/702537-how-can-i-extract-and-save-lbp-features-of-multiple-images-so-that-i-can-use-them-as-a-db-features

The following MathWorks documentation can be referred to know more:

'extractLPBFeatures': https://www.mathworks.com/help/vision/ref/extractlbpfeatures.html

'cell': https://www.mathworks.com/help/matlab/ref/cell.html

Thanks.