Abstract: A method and a system for recognizing a two-dimensional (2D) movement track based on a smart watch is provided. The method comprises: acquiring accelerometer signal data and gyroscope signal data of the smart watch; estimating a tilt angle of the smart watch by using the accelerometer signal data and correcting the gyroscope signal data by using the tilt angle; and calculating angle value information of the smart watch by using the corrected gyroscope signal data and estimating a coordinate point. According to the present application, the movement track of the smart watch can be accurately estimated by using the accelerometer and the gyroscope built in the smart watch.

Abstract: A fruit and vegetable picking method and device based on machine vision and storage medium that includes: acquiring fruit image of fruit or vegetable to be picked currently, calling pre-trained neural network model to identify fruit image, and determining type of fruit or vegetable; acquiring type of fruit or vegetable, and determining cuttable area on stalk of fruit or vegetable according to type of fruit or vegetable, locating cutting point; controlling end picking apparatus to cut off stalk of fruit or vegetable, according to cutting point being determined. By using pre-trained neural network model to detect fruit and cut stalk for picking, one device may be able to pick multiple fruits and vegetables, have high versatility and picking accuracy, avoid hurting pulp, and have improved harvest efficiency and quality of fruits and vegetables picked.

Abstract: Provided are an image fusion classification method and device. The method includes that: a three-dimensional weight matrix of a hyperspectral image is obtained by use of a Support Vector Machine (SVM) classifier (101); superpixel segmentation is performed on the hyperspectral image to obtain K superpixel images, K being a positive integer (102); the three-dimensional weight matrix is regularized by use of a superpixel-image-based segmentation method to obtain a regular matrix (103); and a class that a sample belongs to is determined according to the regular matrix (104).

Abstract: Disclosed is a coating made of an organic material on a mold for glass molding. The coating comprises CrxWyN(1-x-y), where 0.15<x<0.4, and 0.2?y?0.45. The coating has excellent high temperature resistance and anti-adhesion properties, thus being a promising coating material for molds.

Abstract: A 3D shape matching method and a 3D shape matching device based on 3D local feature description using SGHs are provided. In the method, the spherical neighborhood of the feature point is not only divided based on space but also divided based on geometry, the spherical neighborhood of the feature point is not only divided based on the radial direction and the azimuth respectively but also divided based on the elevation, and the spherical neighborhood of the feature point is not only divided based on the deviation angle deviating from the z axis but also divided based on the deviation angle deviating from the x axis. When the deviation angle deviating from the z axis of the spherical neighborhood is divided, the deviation angle is divided more densely where it is closer to the positive direction of the z axis.

Abstract: A method, a device, a computer device and a storage medium for a real-time urban scene reconstruction are provided. The method comprises: obtaining a target image frame and an adjacent image frame corresponding to a target urban scene; locating a position of an object in the target image frame according to the target image frame and the adjacent image frame and obtaining an object point cloud, an object image and a coordinate transformation matrix corresponding to a target object; determining a global characteristic of the target object and parameters of surfaces to be selected of the target object which is configured to determine a characteristic of the surface to be selected; determining a plane combination matrix of the target object; reconstructing a three-dimensional scene model of the target urban scene according to the plane combination matrix, the parameters of the surfaces to be selected and the coordinate transformation matrix.

Abstract: A vibration-based authentication method for an access control system includes: collecting vibration signals generated by a built-in vibration motor in an authentication device; filtering, denoising, and performing endpoint segmentation on the collected vibration signals, and extracting vibration signals containing effective touch; performing an alignment on the segmented vibration signals; performing a fast Fourier transform on the aligned vibration signals to obtain frequency-domain data, extracting frequency-domain features obtained after alignment and features obtained before alignment to construct a training data set, and storing the training data set in a database of the authentication device; using a new unlock signal generated when a user touches the authentication device as test data, and processing the test data to obtain test data containing effective touch; and matching and classifying the test data containing effective touch with the training data set by using a machine learning classification mod

Abstract: A polarization-independent orbital angular momentum modulator based on a chiral fiber grating, a method for manufacturing the same, and an orbital angular momentum beam generator. The orbital angular momentum modulator includes an optical fiber body having a spiral fiber structure, and the spiral fiber structure has a long-period optical fiber grating effect. The optical fiber body has a periodic spiral refractive index modulation in an axial direction. A period of the spiral refractive index modulation has a magnitude of hundreds of microns, and the spiral refractive index modulation is distributed in an axial direction, a radial direction, and an angular direction of the optical fiber body, and configured to excite a spiral phase to generate an orbital angular momentum beam.

Abstract: Based on real-time measurement data, disclosed is a data-driven beam tracking solution for a mobile Millimeter Wave (mmWave) communication system. A disclosed data driving method is based on a dynamically linearized representation of a time-varying pseudo-gradient parameter estimation process. In the disclosure, an effective codebook design method is introduced, so that beam tracking may further be accelerated with a low overhead by beam rotation.

Abstract: The present application discloses a human-computer interaction method and an interaction system based on capacitive buttons. The method comprises the following steps: acquiring a capacitive charging signal generated by a user finger-touching a capacitive button; processing the capacitive charging signal to extract Mel-frequency cepstrum coefficient characteristics; and inputting the Mel-frequency cepstrum coefficient characteristics into a trained hidden Markov model, identifying a finger type of the user touching the capacitive button, and further implementing human-computer interaction according to an identification result.

Abstract: A monitoring method and system based on a magnetic field of a loudspeaker are provided. This method includes: collecting a magnetic field signal near the loudspeaker, and converting the magnetic field signal into a magnetic field digital signal; converting the magnetic field digital signal into a speech signal and removing an interference from the speech signal to obtain a filtered speech signal; removing noise in the speech signal, and performing short-time inverse Fourier transform on a speech power spectrum to obtain a denoised speech signal; equalizing response of the denoised speech signal to each frequency to convert the speech signal into an intelligible speech audio signal; and recognizing the speech audio signal and converting the same into a text content.

Abstract: The present disclosure provides an antibacterial hydrophilic compound. The antibacterial hydrophilic compound may react, induced by light through a hydrogen abstraction group in the structural formula thereof, with a C—H group and thus bind to a surface of a material having the C—H group (for example, chemical fibers such as polyester, chinlon, and the like; plastics, rubbers, and other similar materials), which can impart a durable antibacterial activity and hydrophilicity to the material. The antibacterial hydrophilic compound has a relatively strong binding force to the surface of the material without damaging the mechanical properties of the raw material. The present disclosure also provides a modified material that is modified by the antibacterial hydrophilic compound.

Abstract: Provided is a physical layer blind authentication method for a time-varying fading channel based on a smoothing technique. The method includes that: a transmitter transmits a carrier signal to a wireless channel, the carrier signal includes an authentication signal, a pilot signal and an information signal, and the wireless channel is the time-varying fading channel; a receiver receives the carrier signal, and performs BKIC processing and differential signal processing on the carrier signal to obtain a target authentication signal, performs the differential signal processing on the reference signal to obtain a reference authentication signal, and calculates a correlation between the target authentication signal and the reference authentication signal to obtain a test statistic; and compares the test statistic with a prescribed threshold to determine whether the carrier signal is capable of passing authentication.

Abstract: A method and a device for 3D shape matching based on a local reference frame are proposed. After acquiring a 3D point cloud and feature points in the method, the feature point set is projected to a plane, and feature transformation is performed on the projected points by using at least one factor from the distances between the 3D points and the feature points, the distances between the 3D points and the projected points, and the average distances between the 3D points and its 1-ring neighboring points to acquire a point distribution with a larger variance in a certain direction than the projected point set, and the local reference frame is determined based on the transformed point distribution. The 3D local feature descriptor established based on this local reference frame can encode the 3D local surface information more robustly, so as to obtain a better 3D shape matching effect.

Abstract: Disclosed are a mesh reconstruction method and apparatus for a transparent object, a computer device and a storage medium. The method includes: acquiring object images of the transparent object at multiple capture view angles and calibration information corresponding to an image capture device, the image capture device configured to capture being the object images; generating an initial mesh model corresponding to the transparent object according to the object images acquired at the multiple capture view angles; determining a light ray refraction loss corresponding to an emergent light ray of the image capture device according to the calibration information, and determining a model loss corresponding to the initial mesh model according to the light ray refraction loss; and reconstructing the initial mesh model according to the model loss, to obtain a target mesh model corresponding to the transparent object.

Abstract: A method for establishing a shared key, includes: determining, by a first device, a braid group Bn having an index n as a public key; selecting, by the first device, a plurality of elements from the braid group Bn to generate a subgroup P, and selecting an element x from the subgroup P as a private key; receiving, by the first device, {y?1?1y,y?1?2y, . . . , y?1?n?1y} sent from a second device; sending, by the first device, {x?1?1x,x?1?2x, . . . , x?1?n?1x} calculated according to the first private key and each element of the public key, to the second device, to allow the second device to replace all occurrences of ?k in the second private key y with x??kx to obtain fy(x?1?1x,x?1?2x, . . . , x?1?n?1x)=x?1yx and to obtain the shared key x?1y?1xy by calculation; and replacing all ?k in the first private key of the first device with y?1?ky to obtain fx(y?1?1yy?1?2y, . . . , y?1?n?1y)=y?1xy, and calculating to obtain the shared key x?1y?1xy.

Abstract: The present application relates to methods, apparatuses, computer devices, and storage mediums for generating an aerial photographing path for a UAV. A method according to an embodiment includes acquiring an inputted aerial photographing landmark; obtaining a UAV aerial photographing safe space according to the aerial photographing landmark; constructing a viewing angle quality scalar field of the aerial photographing landmark; and generating an aerial photographing path set in the UAV aerial photographing safe space according to the viewing angle quality scalar field.

Abstract: Methods for image segmentation, computer devices, and storage mediums. The method includes acquiring a to-be-segmented image, inputting the to-be-segmented image into an input variable of a full convolution neural network and outputting a convolution characteristic pattern; inputting the convolution characteristic pattern into an input variable of a context-switchable neural network and outputting context expression information; and generating an intermediate characteristic pattern for image segmentation according to the convolution characteristic pattern and the context expression information.

Abstract: Disclosed is a blind authentication method for a frequency selective fading channel based on a smoothing technique.

Abstract: Provided are a polymer having ultraviolet absorption functionality and preparation method thereof; specifically, three monomers having different ultraviolet absorption bands are used for copolymerization, achieving a significant expansion of the ultraviolet absorption range and achieving the effect of full-band ultraviolet shielding. The obtained polymer film has strong visible light transmittance, fluorescence, easy processing, excellent stability, and remarkable ultraviolet shielding performance, and can be broadly applied in such areas as aviation, construction, agriculture, and optical devices.