In the Computer Vision System Toolbox the default features extraction is using SURF. How can use SIFT feature extraction using bagofFeatures class? Is there a Custom Feature Extractor available for the same?
SIFT features with bagofFeatures
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Not sure SIFT is built into Matlab. This might be because SIFT has a patent. There are some implementations by other people:
https://uk.mathworks.com/matlabcentral/fileexchange/50319-sift-feature-extreaction
http://www.vlfeat.org/matlab/vl_sift.html
You might need to wrap a call to one of these in a function that fits the required format of the
extractorFcnargument ofbagOfFeatures.