INFRARED PRESENCE SENSING WITH MODELED BACKGROUND SUBTRACTION

摘要

A motion sensing device (300) includes an infrared radiation (IR) sensor (325) configured receive IR signal (310) from a warm object (312) and background (314) IR to produce a direct current output (330). A first transformation filter (340) receives the direct current output (330) and produces a filtered background (345). A second transformation filter (350) receives the direct current output (330) and produces a filtered signal (355). A rating (370) compares the filtered signal (355) and the filtered background (345) to produce a result signal based on a detected difference between the filtered signal (355) and the filtered background (345).