I am a beginner in image processing. I have some questions regarding HOG.
From this website, it mentioned that each element inside the HOG descriptor will be divided by the sum of all elements in a block. However, how to do block normalization if overlapping the blocks? I do not understand because some elements in the vector will be elements of more than one blocks.
For example, if we have a histogram [v11 v12 v13 v14...v19] ,[v21 v22 v23 v24...v29], [v31 v32 v33 v34 v35...v39] and [v41 v42 v43 v44..v49] in the red block, we can normalize the first element of the first vector like this: v11/(v11+v12+...+v21+v22+v23+..+v31+v32+...+v41+v42...+v49)
However, how can I normalize the vectors in the red block and yellow block?
Thank you very much.