How to know the size of imageDatastore?

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Hadi Ghahremannezhad
回答： Srivardhan Gadila 2020-9-28
Is there a function that returns the total number of images in an imageDatastore?
For example, if I load images from a directory and wanted to know the total number of images and index each image, how can I do that?
imds = imageDatastore(ipath, 'FileExtensions', {'.jpg', '.tif', '.png'});
i = 1;
while hasdata(imds)
[img, imgInfo] = readImage(imds, i);
fprintf('process %s \n', imgInfo.('Filename'));
i = i+1;
end
The above code shows out of index error ( i exceeds number of files ).
and is this the fastest way to read images from a location?

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采纳的回答

Srivardhan Gadila
Srivardhan Gadila 2020-9-28
You can access the Files property of the imageDatastore & call the numel function on it.
imds = imageDatastore({'street1.jpg','street2.jpg','peppers.png','corn.tif'})
numImages = numel(imds.Files)

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