Hi John,
I understand that you are using bagOfFeatures objects for feature recognition, and at least three copies of the same images are created.
You can use a custom feature extractor function to extract features from the images in Datastore. This would reduce memory and storage usage, and you can avoid creating a separate copy of the images in the BOF structure.
There is a "CustomExtractor" option in the "bagOfFeatures" object constructor. Upon using the constructor, it will return a bag of features that uses a custom feature extractor function to extract features from images in "imds.extractorFcn" (It is a function handle to a custom feature extraction function).
Please refer the following MATLAB Documentation to understand how to Create a Custom Feature Extractor:
You can also downsample the images before creating the bagOfFeatures object using the "imresize" function in MATLAB.
For more details about the "bagOfFeatures" object, please go through the following MATLAB Documentation:
Hope this helps.
Regards
Ninad
