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Detect if a chair is occupied using Arduino with some sensors

I want to detect if a seat is occupied by a person. This is the answer that I found on Stackoverflow.

However, how accurate is the output of 4 suggested sensors? Will the computing of all these 4 sensor values into one boolean recognize a case when, for instance, a box of 40kg is placed on a seat and some person is just slightly "shaking" that seat with a hand? In those cases Arduino should recognize that a seat is not occupied by a person. Will it work with only 4 sensors or is there any better and more accurate solution (maybe some existing library)? I guess that CapSense-Library is not applicable in my case.