A gesture recognition apparatus, a gesture recognition method, a computer device and a storage medium are disclosed. The gesture recognition apparatus includes a controller, a first distance sensor and a second distance sensor, wherein a first measurement area of the first distance sensor partially overlaps a second measurement area of the second distance sensor; and the controller is configured to recognize a gesture to be measured according to a first trajectory and a second trajectory as well as a position relationship between the first distance sensor and the second distance sensor.

A laser perception-based method for spatial positioning of an agricultural robot: erecting a laser radar with a ranging function in a positioning space, setting a three-dimensional coordinate system, and conducting scanning using the laser radar to obtain point cloud data of an object in the positioning space, where the point cloud data include an azimuth and a distance with respect to the laser radar; installing a laser receiver on the agricultural robot, receiving a laser radar signal using the laser receiver during movement, when a laser beam emitted by the laser radar irradiates the laser receiver, outputting laser signal data and elevation data from the laser receiver; conducting time-event matching on the laser signal data obtained by the laser receiver and the point cloud data scanned by the laser radar within each scanning period of the laser radar to obtain three-dimensional coordinates of a central position of the laser receiver.

Optical signal receivers, systems, and methods of operating the same include a non-line of sight optical signal receiver configured to receive and detect a complex modulated optical signal through a non-line of site propagation path from an optical transmitter, comprising an optical resonator configured to receive the complex modulated optical signal through the non-line of sight propagation path, and to convert the complex modulated optical signal to an intensity modulated signal, and a detector configured to convert the intensity modulated signal into an electrical signal, the electrical signal having an amplitude indicative of an intensity of the intensity modulated signal from the optical resonator, and to provide a detected signal.

Aspects relate to techniques for communication between wireless communication devices using ranging channel information obtained by each of the wireless communication devices. For example, a first wireless communication device may obtain first monostatic ranging channel information based on reflected ranging signals received in response to transmission of a ranging signal. In addition, the first wireless communication device may receive ranging feedback information from a second wireless communication device associated with second monostatic ranging channel information obtained by the second wireless communication device. The first wireless communication device may then determine bistatic channel information from the first monostatic ranging channel information and the ranging feedback information and transmit a message to the second wireless communication device based on the bistatic channel information.

A photonic integrated circuit including having a semiconductor substrate having integrated a semiconductor light source, the semiconductor light source comprising: an optically active section comprising a gain section and configured to support a first number of wavelengths, an optically passive section comprising a passive waveguide optically coupled to the optically active section and a passive section mirror optically coupled to the passive waveguide, wherein the optically passive section is configured to support a second number of wavelengths that is lower than the first number; and the optically passive section further comprising a signal shifting structure configured to shift a signal of the light supported by the passive waveguide.

The present application relates to methods, devices and systems for transparent object three-dimensional reconstruction. The system comprises a structure light generation module, an image acquisition module, a control module and a computing module. The computing module acquires image pairs from the image acquisition module; calculates three-dimensional positions of points according to the image pairs; and performs refinement process to extract first-reflection points. The refinement process comprising: when reflection points are obtained by a first camera, the points include a first point and a second point, the first point is closer to reflection spot of laser on galvanometer mirror than the second point, remove the second point; when the first point is not obtained by a second camera, remove the first point; when the second point is obtained by the second camera, retrieve the second point, and when a discrete external virtual contour is formed, remove the discrete external virtual contour.

The present disclosure provides a system for intercepting a rogue drone, the system comprising: a broad-angle electromagnetic radiation emitter for illuminating a cone of sky with coded electromagnetic radiation; and an air vehicle. The air vehicle comprises: an electromagnetic radiation detector for receiving coded electromagnetic radiation reflected from a rogue drone operating in the cone of sky, the detector comprising a notch filter for selecting the coded electromagnetic radiation and for disregarding light from other sources; and a controller for determining the position of the rogue drone based on the received coded electromagnetic radiation. The present invention also provides an air vehicle for intercepting a rogue drone and a method of intercepting a rogue drone.

A waveguide assembly, an integrated chip, and a LiDAR are provided. The waveguide assembly includes a plurality of single-mode waveguides arranged with intervals. The effective refractive index of at least one single-mode waveguide is not equal to that of another adjacent single-mode waveguide.

A lidar system having a lidar transmitter and lidar receiver that are in a bistatic arrangement with each other can be deployed in a climate-controlled compartment of a vehicle to reduce the exposure of the lidar system to harsher elements so it can operate in more advantageous environments with regards to factors such as temperature, moisture, etc. In an example embodiment, the bistatic lidar system can be connected to or incorporated within a rear view mirror assembly of a vehicle.

Apparatus and methods for navigation of a robotic device configured to operate in an environment comprising objects and/or persons. Location of objects and/or persons may changed prior and/or during operation of the robot. In one embodiment, a bistatic sensor comprises a transmitter and a receiver. The receiver may be spatially displaced from the transmitter. The transmitter may project a pattern on a surface in the direction of robot movement. In one variant, the pattern comprises an encoded portion and an information portion. The information portion may be used to communicate information related to robot movement to one or more persons. The encoded portion may be used to determine presence of one or more object in the path of the robot. The receiver may sample a reflected pattern and compare it with the transmitted pattern. Based on a similarity measure breaching a threshold, indication of object present may be produced.