use comments from imwrite for labeling of images using imagedatastore

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HW 2018-2-2
回答： Walter Roberson 2018-2-2
I use the foldernames option for 'LabelSource' in imageDatastore for labeling images. Because I am writing images from workspace variables, it would be convenient (and save time) to not have to place the images in a folder and then pull the image labels from a given folder, but rather from the comment property of jpeg files, which can be created when you use imwrite. (Of course, it would be ideal to be able to bypass the writing of an image before using imageDataStore, but that does not seem possible.)
Is it possible to label images from their comments, when using imageDatastore?

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Walter Roberson
Walter Roberson 2018-2-2
No, but you can pass a Labels property to the imageDataStore call:
"File labels, specified as a vector or cell array of label names, with one name for each file in the datastore. The order of the labels in the array corresponds to the order of the associated files in the datastore."

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