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A feature is a property which can be used to describe objects in machine learning. Most of the time those are values in R^n, but not always.

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How are HOGs calculated?

First, let's talk about what a histogram of directions is. You can think of the image as a 2D discrete function of x and y: I(x,y). You can take partial derivatives of this function: Ix and Iy. So at …
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