Abstract: A PN junction, a method for preparing a PN junction, and a modulator are disclosed. The PN junction includes a slab waveguide layer and a plurality of waveguides. The slab waveguide layer includes P-type doped regions and N-type doped regions, and a carrier-depletion region in a shape of S is formed at a boundary between the two types of regions. Each of the plurality of waveguides arranged at intervals includes a P-type doped region and an N-type doped region, and one carrier-depletion region is formed at a boundary between the two regions. Projections of the P-type doped regions, the N-type doped regions, and the carrier-depletion regions of the plurality of waveguides arranged at intervals on a surface of a slab waveguide region basically coincide with projections of corresponding regions of the slab waveguide layer on the surface of the slab waveguide region.

Abstract: This application relates to the field of image processing, and provides a point light source image detection method and an electronic device. The method includes: obtaining to-be-tested images, and determining pixel brightnesses of the to-be-tested images; determining low-brightness pixels and high-brightness pixels in the images based on the pixel brightnesses; filtering, based on the low-brightness pixels, out an image that does not meet a preset dark environment requirement, and filtering, based on the high-brightness pixels, out an image that does not meet a preset point light source size; and determining, based on a result of the filtering, whether a to-be-tested image is a point light source image. Pixels in images are classified into low-brightness pixels and high-brightness pixels. For the low-brightness pixels, the images are screened based on a preset dark environment requirement, so that the selected point light source images meet the preset dark environment requirement.

Abstract: A method for compressing a neural network includes: obtaining a neural network including J operation layers; compressing a jth operation layer with Kj compression ratios to generate Kj operation branches; obtaining Kj weighting factors; replacing the jth operation layer with the Kj operation branches weighted by the Kj weighting factors to generate a replacement neural network; performing forward propagation to the replacement neural network, a weighted sum operation being performed on Kj operation results generated by the Kj operation branches with the Kj weighting factors and a result of the weighted sum operation being used as an output of the jth operation layer; performing backward propagation to the replacement neural network, updated values of the Kj weighting factors being calculated based on a model loss; and determining an operation branch corresponding to the maximum value of the updated values of the Kj weighting factors as a compressed jth operation layer.

Abstract: This application provides a shooting method. The method may be applied to a terminal device that has a shooting capability, for example, a mobile phone or a network television. By implementing the method, the terminal device can perform image recognition and analysis on a video frame in a video shooting process, to determine a highlight video frame and generate a highlight photo. In this way, a user can simultaneously obtain a video and a highlight photo in the video in a video shooting process, thereby avoiding a problem that a highlight photo is difficult to be shot through manual capture or a problem that picture quality of a highlight photo captured from a shot video is low, reducing user operations, and improving user experience.

Abstract: This application provides a method for determining a recommended scenario and an electronic device. The method includes: determining a recommended scenario of a current image based on a moving distance of a camera on an electronic device and a relationship between a current image and a previous image. When a slight shake occurs on the electronic device or the camera on the electronic device, or a photographed object/scenario does not change violently, continuity of a recommended scenario is preferably ensured, a probability of a jump of the recommended scenario is reduced, and user experience during image shooting is greatly improved.

Abstract: An all-terrain vehicle includes a vehicle frame, seats, and a fuel tank. The vehicle frame defines a cockpit. The seats include a driver seat and a co-driver seat. The driver seat and the co-driver seat are arranged in the cockpit, the cockpit is provided with a driver foot space in front of the driver seat, and the cockpit is also provided with a co-driver foot space in front of the co-driver seat. The fuel tank is arranged in the cockpit, and is located between the driver foot space and the co-driver foot space.

Abstract: A vehicle is provided. The vehicle includes: a frame; a seat arranged on the frame; a powertrain arranged on the frame; a steering system arranged on the frame, and including a steering shaft, the steering shaft being located in front of the powertrain; and a fuel tank located behind the steering shaft and in front of the powertrain.

Abstract: An all terrain vehicle is provided and includes a vehicle frame, a front end of the vehicle frame being provided with a front axle, and a rear end of the vehicle frame being provided with a rear axle; a cushion arranged on the frame vehicle; an engine arranged on the vehicle frame and located below the cushion; a power motor arranged on the vehicle frame, the engine being drivingly connected to one of the front axle and the rear axle, the power motor being drivingly connected to the other of the front axle and the rear axle; a front wheel and a rear wheel, the front wheel being connected to the front axle, and the rear wheel being connected to the rear axle.

Abstract: An optical modulator includes a beam splitter, a first ground electrode, a first waveguide, a first signal electrode, a second waveguide, a second signal electrode, and a beam combiner. An output end of the beam splitter is connected to input ends of the first waveguide and the second waveguide. An input end of the beam combiner is connected to output ends of the first waveguide and the second waveguide. The first signal electrode is located between the first waveguide and the second waveguide. The first waveguide is located between the first ground electrode and the first signal electrode. The second waveguide is located between the first signal electrode and the second signal electrode.

Abstract: This application provides a video processing method and a related apparatus, to perform scene analysis and scene transition analysis on a video recorded by a user, to delete an invalid segment from the recorded video, edit a plurality of highlight video segments from the recorded video, and fuse the plurality of highlight video segments into one highlight video. In this way, viewing experience of the video recorded by the user can be improved.

Abstract: The invention provides a method and a system for generating a robust higher-order Poincaré sphere polarization state.

Abstract: This application is applicable to the field of terminal technologies, and provides a photographing method and an electronic device. A corresponding candidate image is determined from each group of preview images falling within an observation time window sequentially, each time after a candidate image of a group of preview images is determined, the currently determined candidate image is buffered in one preset first buffer region, and in a case that all first buffer regions are occupied, a candidate image with earliest buffer time in all the first buffer regions is replaced with the currently determined candidate image. In a case that a photographing operation is detected, a to-be-compared image is determined from candidate images currently buffered in the first buffer regions and an observation buffer region, and a manual snapshot image corresponding to the photographing operation is determined from the to-be-compared image and all preview images within preset duration.

Abstract: The invention provides a method and a system for generating a polarized propagation-invariant light field. The system includes a laser source, a spatial light modulator, a computer, a first lens, a shading element, a first quarter-wave plate, a second quarter-wave plate, a second lens, and a beam combining element. In the present invention, two Laguerre-Gaussian mode beams that satisfy a particular Gouy order relationship are generated, and orthogonal even polarization is applied to the two Laguerre-Gaussian mode beams. The two Laguerre-Gaussian mode beams are then focused onto a Ronchi grating to be stably combined into polarized propagation-invariant light field. The light field generated in the present invention simultaneously has linear polarization, elliptical polarization, and circular polarization in a cross section of the light field, and in a propagation process of the light field in free space, apart from normal spot size scaling, polarization distribution remains unchanged.

Abstract: This application provides a video processing method and a related apparatus, to perform scene analysis and scene transition analysis on a video recorded by a user, to delete an invalid segment from the recorded video, edit a plurality of highlight video segments from the recorded video, and fuse the plurality of highlight video segments into one highlight video. In this way, viewing experience of the video recorded by the user can be improved.

Abstract: A Mach-Zehnder (MZ) modulator includes a splitter, two modulation arms, and a coupler. The two modulation arms include two optical transmission waveguides and two electrodes. The splitter is configured to perform power splitting on an optical carrier to obtain two optical carriers and input the two optical carriers to corresponding input ports of the two optical transmission waveguides, respectively. The two electrodes include a first electrode and a second electrode which are respectively configured to receive two differential electrical signals and apply the two differential electrical signals to the two optical transmission waveguides to change phases of the two optical carriers. Two input ends of the coupler are connected to output ports of the two optical transmission waveguides, respectively, and are configured to perform interference on the optical carriers whose phases are changed via the two modulation arms and output the optical carriers.

Abstract: Rotational translation of an inertial mass rotor is used for providing damping of low frequency noise and vibration. An axial component is mounted so as to translate axial movement of an inertial linearly-displaceable member to rotational movement of an inertial mass rotor. The translation to rotational movement of the inertial mass rotor provides inertial amplification in the form of translational-rotational coupling. This enables the construction of a compact assembly, which allows light ultra-low frequency resonances to be concentrated, and which absorbs such low frequency noise energy.

Abstract: An optical source switching apparatus including first optical sources, an optical cross-connect device, second optical sources, and a first coupler. The optical cross-connect device is connected to the first optical sources and the first coupler, and the first coupler is connected to the second optical source; both the first optical source and the second optical source are configured to output continuous optical energy, and the optical cross-connect device is configured to enable optical energy output by at least one of the first optical sources to enter the first coupler when at least one of the second optical sources fails; and the first coupler is configured to implement beam splitting of the optical energy output by the first optical source or the second optical source.

Abstract: This application provides a shooting method. The method may be applied to a terminal device that has a shooting capability, for example, a mobile phone or a network television. By implementing the method, the terminal device can perform image recognition and analysis on a video frame in a video shooting process, to determine a highlight video frame and generate a highlight photo. In this way, a user can simultaneously obtain a video and a highlight photo in the video in a video shooting process, thereby avoiding a problem that a highlight photo is difficult to be shot through manual capture or a problem that picture quality of a highlight photo captured from a shot video is low, reducing user operations, and improving user experience.

Abstract: A video processing method and an electronic device are provided. Includes: displaying a first interface, the first interface includes a first control and a first area, the first area displays a thumbnail of a first photo and a thumbnail of a second photo, the first photo is automatically taken at a first moment, the second photo is automatically taken at a second moment, the first video clip is a first scene, the second video clip is a second scene, the first photo is a photo in the first video clip, the second photo is a photo in the second video clip, a score of the first photo is greater than a first threshold, a score of the second photo is greater than a second threshold; displaying a second interface in response to a second operation with respect to the first control.