Talk:Histogram of oriented gradients

The paper by Dalal and Triggs must be cited in the introduction, not just somewhere below! — Preceding unsigned comment added by 80.156.43.137 (talk) 09:29, 9 December 2013 (UTC)[reply]

Introductory comment

This article is rather inaccessible to beginners. I would have done the changes myself, but I came to this article precisely because I was not sure I understand HOG features. For one, it doesn't say, in simple words, a HOG descriptor is so-and-so, and this is how they can be computed. The rest of the theory and motivation behind the HOG descriptor is quite useful, but without a concise description of what they are, this page sort of misses its purpose.

Muxdevil (talk) 05:05, 22 November 2010 (UTC)[reply]

Orientation binning gradient image selection criteria for counting

As a matter of practical detail the computation of a histogram is easy--counting of things in range oriented bins, however, the text in the article does not say how the n histogram cells in 180 or 360 degrees have their gradient image points selected or found for counting?

For what range of distances surrounding the given gradient image pixel are considered for selection?

Do the counts get truncated as soon as a gradient image pixel is considered blank / background / too near to zero, etc.

In the human detection system referred to, are these 9 directions for selection points the 8 surrounding pixel gradient values & the pixel itself, or more?

Are the gradients selections compared to a given threshold prior to being counted (or not) into a bin?

The finding or selection criteria should be spelled out more clearly so that a reader does not have to guess how it is done or read & understand the scholarly paper(s) written on this topic.

Could some knowledgeable person please revise the text so as to clarify it in this regard? Oldspammer (talk) 20:42, 16 February 2012 (UTC)[reply]

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Needs an Example Image

there are no explanatory images in the article, which is about image processing. 135.180.116.182 (talk) 00:00, 11 February 2024 (UTC)[reply]