An LED security light includes a light emitting unit, at least one sensing unit, a loading and power control unit and a power supply unit configured with a first power source and a second power source, wherein a power level detector and a power switching circuitry are installed to select and connect at least one of the first power source and the second power source to the light emitting unit. The light emitting unit is activated at dusk and is deactivated at dawn. When the first power source is used, the LED security light generates a first level illumination. When the second power source is used, the LED security light generates a second level illumination. The first power source is a solar power while the second power source is a backup battery.

An LED security light includes a light emitting unit, at least one sensing unit, a loading and power control unit and a power supply unit configured with a first power source and a second power source, wherein a power level detector and a power switching circuitry are installed to select and connect at least one of the first power source and the second power source to the light emitting unit. The light emitting unit is activated at dusk and is deactivated at dawn. When the first power source is used, the LED security light generates a first level illumination. When the second power source is used, the LED security light generates a second level illumination. The first power source is a solar power while the second power source is a backup battery.

An audio/video (A/V) recording and communication device includes a camera, a passive infrared (PIR) sensor, and a light sensor. A method receives a PIR sensor output signal from the PIR sensor, receives image data from the camera, and receives a light sensor output signal from the light sensor. The method determines, using the light sensor output signal and at least one of the PIR sensor output signal and the image data whether to activate recording of the image data, and upon determining to activate recording of the image data, generates an alert. The method transmits the alert to a client device associated with the A/V recording and communication device.

A computing-device implemented system and method for identifying an item in an x-ray image is described. The method includes training a machine learning algorithm with at least one training data set of x-ray images to generate at least one machine-learned model. The method further includes receiving at least one rendered x-ray image that includes an item, identifying the item using the at least one model, and generating an automated detection indication associated with the item.

A computing-device implemented system and method for identifying an item in an x-ray image is described. The method includes training a machine learning algorithm with at least one training data set of x-ray images to generate at least one machine-learned model. The method further includes receiving at least one rendered x-ray image that includes an item, identifying the item using the at least one model, and generating an automated detection indication associated with the item.

Occupancy detection is an increasingly important part of building control logic, as new systems and control logic greatly benefit from human-in-the-loop sensing. Current approaches such as CO.sub.2 monitoring, acoustic detection, and PIR based motion detection are limited in scope, as these variables are a proxy for occupancy, and at best can be roughly correlated to occupancy, and cannot reliably provide a count of the number of occupants. The disclosed sensor uses thermal information that is continually being emitted by human occupants and optical processing to count and spatially resolve the location of occupants in a room, allowing ventilation flow rates to be properly controlled and directed, if enabled. Occupant detection and counting cheaply and reliably without moving parts is the holy grail of building controls at the moment, which are the basic design principles behind the disclosed inexpensive, static, and stable thermographic occupancy detection sensor.

A anti-theft device with a remote alarm feature is provided. The device is configured to attach to an item of retail merchandise and detect when a predetermined motion and light condition are met which together are indicative of a potential retail theft. Upon detection, the device is configured to generate a local alarm, and send a radio frequency to a remote device to generate an alarm at the remote device.

A system for monitoring a petrochemical installation is disclosed. The system can include an optical imaging system comprising an array of optical detectors. The system can comprise processing electronics configured to process image data detected by the optical imaging system. The processing electronics can be configured to detect a target species based at least in part on the processed image data. The processing electronics can further be configured to, based on a detected amount of the target species, transmit an alarm notification to an external computing device over a communications network indicating that the target species has been detected at the petrochemical installation.

Disclosed is a system that performs motion analysis in a field of interest. The system may include at least one gateway disposable proximal to the field of interest. Further, the system may include a plurality of motion sensors. Further, a motion sensor may include a photodetector array, a processor and a wireless transmitter. Further, the wireless transmitter may be configured to transmit the digital information to at least one of a motion sensor of the plurality of motion sensors and the at least one gateway. Additionally, the system may include a plurality of video cameras disposable at a plurality of key locations in the field of interest. Further, at least one video camera may be further configured to transmit a part of a corresponding image sequence to at least one of the remote monitoring center through the at least one gateway.

Disclosed is a system that performs motion analysis in a field of interest. The system may include at least one gateway disposable proximal to the field of interest. Further, the system may include a plurality of motion sensors. Further, a motion sensor may include a photodetector array, a processor and a wireless transmitter. Further, the wireless transmitter may be configured to transmit the digital information to at least one of a motion sensor of the plurality of motion sensors and the at least one gateway. Additionally, the system may include a plurality of video cameras disposable at a plurality of key locations in the field of interest. Further, at least one video camera may be further configured to transmit a part of a corresponding image sequence to at least one of the remote monitoring center through the at least one gateway.