When computing a descriptor using the histogram of gradients (HoG) approach for a given keypoint , which of the following propositions can be true?

Question

When computing a  descriptor  using the  histogram of gradients (HoG)  approach for  a given keypoint , which of the following propositions can be true?

Answer

We need to blur the image to avoid gradient spikiness (noise)

Answer

We need to quantify the direction of gradients.

Answer

We need to threshold the image to keep only some illumination level.

Answer

We  must  take into account the magnitude of the gradient.

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When computing a descriptor using the histogram of gradients (HoG) approach ...

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