US 2026/0079052 A1Published application

Human presence detection system and human motion detection system

AssigneeLite-On Singapore Pte. Ltd.

InventorsSaswati Dey, JUN-HUA HE, WEI JIAN JENSON NEO, George Chun-Wei Yee

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Abstract

A human presence detection system and a human motion detection system. A detection apparatus that includes a thermal sensor, a lens mounted on the thermal sensor, and a controller are incorporated into the system. The lens is configured to focus thermal radiation incident from a spatial zone or the thermal radiation being radiated by an object onto the thermal sensor for sensing the thermal radiation and outputting a temperature signal. The controller incorporates filters and circuits to process the temperature signal and output digital temperature counts proportional to the thermal radiation from the spatial zone or the object. The detection apparatus can accordingly perform human presence detection or human motion detection by processing fluctuation of the digital temperature counts.

Claims17

Dependent claims

A human presence detection system, comprising:

a thermal sensor;
a lens mounted on the thermal sensor, configured to focus thermal radiation incident from a spatial zone onto the thermal sensor, wherein the thermal sensor is configured to sense the thermal radiation from the spatial zone and output a temperature signal;
and
a controller, coupled to the thermal sensor, configured to set a first threshold and a second threshold, wherein the first threshold is greater than the second threshold, and to detect human presence according to the temperature signal, the first threshold and the second threshold;
wherein the controller comprises a low-pass filter and a Kalman filter, the controller is further configured to input the temperature signal into the low-pass filter, and the low-pass filter is configured to output a filtered temperature signal;
wherein the controller is further configured to obtain a first difference signal by computing a difference between the temperature signal and the filtered temperature signal, and to input the first difference signal into the Kalman filter, and wherein the Kalman filter is configured to output a second difference signal.

3 more elements

A human motion detection system, comprising:

a thermal sensor;
a lens mounted on the thermal sensor, configured to focus thermal radiation incident from a spatial zone onto the thermal sensor, wherein the thermal sensor is configured to sense the thermal radiation from the spatial zone and output a temperature signal;
and
a controller, coupled to the thermal sensor, configured to set a first threshold and a second threshold, wherein the first threshold is greater than the second threshold, and to detect human motion according to the temperature signal, the first threshold and the second threshold;
wherein the controller comprises a differentiator and a median filter, the controller is configured to input the temperature signal into the differentiator, and the differentiator is configured to output a rate of change of the temperature signal;
wherein the controller is further configured to input the rate of change of the temperature signal into the median filter, and the median filter is configured to output a filtered rate of change of the temperature signal.

3 more elements

A human motion detection system, comprising:

a thermal sensor;
a lens mounted on the thermal sensor, configured to focus thermal radiation incident from a spatial zone onto the thermal sensor, wherein the thermal sensor is configured to sense the thermal radiation from the spatial zone and output a temperature signal;
and
a controller, coupled to the thermal sensor, configured to set a first threshold and a second threshold, wherein the first threshold is greater than the second threshold, and to detect human motion according to the temperature signal, the first threshold and the second threshold;
wherein the controller is configured to perform a convolution process on the temperature signal to obtain a convolution signal.

2 more elements

Dependencies are inferred from the claim text.