How does grid extracts feature descriptors in the Bag of Visual Words?

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Zeynab Mousavikhamene on 23 Feb 2020

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Commented: Zeynab Mousavikhamene on 27 Mar 2020

Accroding to here:

https://www.mathworks.com/help/vision/ug/image-classification-with-bag-of-visual-words.html

If you choose to grid for extracting features from images, how does that work? Apparently it does different than feature detection which is based on speeded up robust features (or SURF).

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Answer 1

Jalaj Gambhir on 27 Feb 2020

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Hi,

'grid' algorithm is a Point Selection Method which is the followed by the step of Feature Extraction from the selected points (grids). You can read more about it here ('PointSelection' section and the following 'GridStep' section).