Hi, is it possible to implement a customized bagOfFeatures with a SIFT extractor? and detector?

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Arthur Costa
Arthur Costa 2016-4-11
评论： shalaw faraj 2020-3-21
I'm using MATLAB R2014b version with computer vision toolbox. I'm trying to generate classifiers with different types of extractors to analyse handwritten words, and for that i'm making use of bagOfFeatures function. MATLAB doesn't have a SIFT extractor code but it's possible to implement it or use David Lowe's version. How can i use this SIFT extractor (and detector) with the bagOfFeatures function?
Thanks

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Anand
Anand 2016-4-12
If you can upgrade to a later version (R2015a or higher), you can use the 'CustomExtractor' name-value pair to do this. Unfortunately, this wasn't part of R2014b.
http://www.mathworks.com/help/releases/R2015a/vision/ref/bagoffeatures-class.html

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Image Analyst
Image Analyst 2016-4-11
SIFT is still patented by the University of British Columbia for a few more years. I believe the Computer Vision System Toolbox uses SURF instead.
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Arthur Costa
Arthur Costa 2016-4-19
Thanks! That's one reason. But for research purposes they have provided a demo software at David Lowe's page: http://www.cs.ubc.ca/~lowe/keypoints/
But it doesn't run properly. I keep getting an error with 'Invalid keypoint file beginning'
'

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