SIFT features with bagofFeatures

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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?

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David Pickup On

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 extractorFcn argument of bagOfFeatures.