image processing base ideas

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image-recognition

hi am doing project called Implementation of Smart Elevator System based on
Wireless Multi-hop AdHoc Sensor Networks,,,for that i need to do count the number of people currently standing outside elevator ,so that i can get through the cam ,then i need to count people in that group photo ,so how and which technology can be used for doing that, based on image processing ,,,,,is it in matlab or openCV,,,,possiple,,,,if any idea plz forward !