# How to measure the number of people in a picture of a crowd?

Background: Israel (and the middle east in general) is filled with protests.

I am curious, when given a picture, to estimate how many people are in that picture (often a picture of a large crowd).

What modelling can offer some solution to this problem? (and, of course, can it be done with any open source package. Say, R?)

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Hi cardinal - thank you for the link. The question I ask is more specialized to a specific case (which is not answered in the link you give). I am not sure there is an answer, but still. With regards, Tal –  Tal Galili Jul 14 '12 at 20:41
Is it a picture of the whole crowd? Is the picture taken from above or is it taken at eye level? To have success you'll want a standard protocol for what counts as a picture. –  jlovegren Jul 19 '12 at 21:54
I assume a picture of the whole crowd from above. –  Tal Galili Jul 20 '12 at 9:02