Abstract: The present disclosure provides a non-contact fatigue detection system and method based on rPPG. The system and method adopt multi-thread synchronous communication for real-time acquisition and processing of rPPG signal, enabling fatigue status detection. In this setup, the first thread handles real-time rPPG data capture, storage and concatenation, while the second thread conducts real-time analysis and fatigue detection of rPPG data. Through a combination of skin detection and LUV color space conversion, rPPG raw signal extraction is achieved, effectively eliminating interference from internal and external environmental facial noise; Subsequently, an adaptive multi-stage filtering process enhances the signal-to-noise ratio, and a multi-dimensional fusion CNN model ensures accurate detection of respiration and heart rate.

Abstract: A method for making a cover plate, a cover plate and an electronic device. The method for making the cover plate includes: disposing a light-shielding material on a periphery of a first light-transmitting material and a periphery of a second light-transmitting material; squeezing the first light-transmitting material, the second light-transmitting material and the light-shielding material to obtain a composite rod material; and treating the composite rod material to obtain the cover plate.

Abstract: The present invention provides a multichannel parallel light emitting device comprising a semiconductor cooler, a cold surface of the semiconductor cooler completely covers the area of a hot surface, and when the hot surface and the cold surface are horizontally disposed, a horizontal distance is reserved between the edge of the cold surface and the edge of the hot surface, and a positive electrode and a negative electrode are fixed on a second surface of the cold surface.

Abstract: A torsion-adjustable impact wrench, includes a housing, a powering unit including an impact mechanism configured to generate an intermittently increasing torque, an adjusting unit configured to manually set a first torsion value and generate a corresponding a first torsion signal, a detecting unit configured to detect a rotational speed of the powering unit and generate a corresponding first rotational speed signal, and a control unit configured to generate a control signal for controlling the output of the rotational speed of the powering unit. The control unit generates a second rotational speed signal according to the first torsion signal outputted by the adjusting unit, compares the first rotational speed signal with the second rotational speed signal, and generates a control signal enabling the rotational speed of the powering unit to approach the second rotational speed.

Abstract: A torsion-adjustable impact wrench, includes a housing, a powering unit including an impact mechanism configured to generate an intermittently increasing torque, an adjusting unit configured to manually set a first torsion value and generate a corresponding a first torsion signal, a detecting unit configured to detect a rotational speed of the powering unit and generate a corresponding first rotational speed signal, and a control unit configured to generate a control signal for controlling the output of the rotational speed of the powering unit. The control unit generates a second rotational speed signal according to the first torsion signal outputted by the adjusting unit, compares the first rotational speed signal with the second rotational speed signal, and generates a control signal enabling the rotational speed of the powering unit to approach the second rotational speed.

Abstract: Conventional electro-optical imaging systems can not achieve wide field of view (FOV) and high spatial resolution imaging simultaneously due to format size limitations of image sensor arrays. To implement wide field of regard imaging with high resolution, mechanical scanning mechanisms are typically used. Still, sensor data processing and communication speed is constrained due to large amount of data if large format image sensor arrays are used. This invention describes an electro-optical imaging system that achieves wide FOV global imaging for suspect object detection and local high resolution for object recognition and tracking. It mimics foveated imaging property of human eyes. There is no mechanical scanning for changing the region of interest (ROI). Two relatively small format image sensor arrays are used to respectively acquire global low resolution image and local high resolution image. The ROI is detected and located by analysis of the global image.

Abstract: Conventional electro-optical imaging systems can not achieve wide field of view (FOV) and high spatial resolution imaging simultaneously due to format size limitations of image sensor arrays. To implement wide field of regard imaging with high resolution, mechanical scanning mechanisms are typically used. Still, sensor data processing and communication speed is constrained due to large amount of data if large format image sensor arrays are used. This invention describes an electro-optical imaging system that achieves wide FOV global imaging for suspect object detection and local high resolution for object recognition and tracking. It mimics foveated imaging property of human eyes. There is no mechanical scanning for changing the region of interest (ROI). Two relatively small format image sensor arrays are used to respectively acquire global low resolution image and local high resolution image. The ROI is detected and located by analysis of the global image.

Abstract: This invention describes a novel coding and implementation techniques for high-speed high-density optical disk data storage. Multiple narrowband spectral beams, either coherent or non-coherent, are combined together by optical fiber couplers or lenses assembly and are then focused into a photosensitive film with diffraction limited spot size through a specially designed hybrid diffractive/refractive lens with extended depth of focus, so that the beam size remains diffraction limited size in the whole depth of the recording medium volume. Multiple reflection gratings which are respectively corresponding to these used spectral bands are recorded in the medium through interferences between the incident beams and the reflected beams from a reflection mirror which is attached at the back surface of the recording film.

Abstract: An evanescent optically coupled electronic device including: a backplane wave guide or mother board including a set of parallel carriers that define a first plurality of parallel channels and include a first array of optical fibers having exposed cores in the first plurality of parallel channels; at least one electronic card or daughter board including a high speed optical waveguide bus; a flexible fiber ribbon or film including waveguides made up of individual optical fibers of locally increased refractive index joined by a web of suitable material forming the high speed optical waveguide bus and optically connecting the backplane waveguide and the at least one electronic card with no 90° angle turns; and a mechanism for retaining the first array of optical fibers having exposed cores in abutting and facing evanescent optical contact with the individual optical fibers in the flexible fiber or ribbon.

Abstract: A lens includes a diffractive surface having an etched structure and a refractive surface having a curved structure. The lens reduces chromatic aberration of incident light and extends depth of focus. In one alternative, the etched structure is a calculated phase pattern or a pattern that is embossed or diamond tuned. In another alternative, the curved structure is convex shaped or concave shaped. In yet another alternative, the lens is an imaging lens wherein high lateral resolution of incident light is preserved.

Abstract: An ideal filament preheat technique in flourescence lamp is supplied by an adjusting circuit, an output circuit and a control circuit. At the filament preheating stage, an adequate preheating voltage is provided for the filament of the lamp tube, and the voltage cross over both ends of the lamp tube is reduced, thereby preventing glow current in preheating. When the preheating stage is finished and starting stage begins, the voltage between both ends of the lamp tube increases simultaneously, and then reaches a break-down voltage of the lamp tube, then the lamp tube is lit to enter a normal operation stage, the preheating voltage of the filament is cutoff under the control circuit, so as to save the filament power consumption. Therefore, the efficiency of the electronic ballast is improved, and the operation life of the flourescent lamp tube is extended.

Abstract: An electronic ballast includes a power supply circuit comprising an electromagnetic compatible filter circuit, a rectifier circuit, a power factor correcting circuit, a DC filter circuit, and a DC/AC converter circuit connected successively, wherein: the electronic ballast further includes an adjusting circuit, an output circuit, and a control circuit. At a preheating stage, a preheating voltage is provided to the filament of the lamp tube, and the voltage applied between both ends of the lamp tube is reduced at the preheating stage, thereby preventing glow discharge in preheating from occurring. At a starting stage, the voltage between both ends of the lamp tube increases instantly, and reaches a break-down voltage of the lamp tube, at this time the lamp tube is lit, entering a normal operation stage and the preheating voltage of the filament is removed via the control circuit, so as to make the filament power consumption in conventional electronic ballast non-existent when the lamp tube operates normally.