Adaptive filtering for presence detection

The invention relates to adaptive filtering for presence detection. A system and method for sensing a user presence via thermal signature sensing employs adaptive filtering of a motion spectrum to discern a user presence signature (400) over background thermal noise. In an embodiment, adaptive sub-band filters (701, 703, 705, 707, 709) are applied (500) within the motion spectrum, and a user presence is indicated (409) by the presence of a thermal signature having at least a predetermined magnitude or profile within any searched sub-band. In an embodiment, a low pass filter is applied (413) to search for a stationary presence if the sub-band search procedure does not yield a user thermal signature. 本发明涉及种用于存在检测的自适应滤波。用于经由热签名感应来感应用户存在的系统和方法使用了运动频谱的自适应滤波来识别在背景热噪声上的用户存在签名(400)。在实施例中，自适应子带滤波器(701、703、705、707、709)在运动频谱内应用(500)，且用户存在由在任何搜索的子带内的具有至少预定幅度或轮廓的热签名的存在来指示(409)。在实施例中，如果子带搜索流程没有产生用户热签名的话，低通滤波器被应用(413)来搜索静止存在。