I would like to reliably detect the presence of a human within a defined radius of a fixed place in a room. Think of a diamond in an art museum -- if there's a person within 5 feet of it, I could use the sensor to output a signal as a continuous 1 otherwise 0. Further, would it also work for a half-circle (such as a portrait on the wall in the museum)?
CurrentlyI am currently doing this with opencvOpenCV and a webcam, but there's too much delay >200ms> 200 ms in processing. I'm hoping for a better approach that can provide latency <20ms< 20 ms.