34 results about "Spatial filter" patented technology

The application discloses a kind of optical fiber side light extraction structure and method, belong to optical fiber side light extraction technical field, structure has including femtosecond grating light extraction component, filter component including filter layer and with slit light shielding layer, and detection component.The method includes: with grating diffraction separation optical signal in fiber core, with filter component filters optical signal, with detector receives signal.The application is by femtosecond laser in fiber core and writes small refractive index modulation area, with diffraction effect will transport light be introduced with specific angle to side, again cooperate external filter and metal slit and constitute spatial filter, physically block the stray light deviating from preset angle.This internal diffraction+external filter synergic mechanism avoids physical damage optical fiber surface, and realizes high purity, high directional signal extraction under micro size.

A system and method for identifying container numbers on front-mounted cranes are disclosed, relating to the field of container number identification on front-mounted cranes. To address the shortcomings of existing methods, such as inability to adapt to rainy or snowy weather and low-light conditions, poor container number identification performance, and poor anti-interference capabilities, this invention acquires video or images of containers on front-mounted cranes; extracts continuous frames from the video at a fixed frequency and performs grayscale processing on each frame to reduce computational complexity; applies temporal filtering to the preprocessed video / image; applies spatial filtering to the filtered video / image to remove isolated noise points; reduces high-frequency noise and smooths the image through weighted averaging; enhances image contrast by adjusting the grayscale distribution of the image, making the container number area clearer; and performs container number area detection and character recognition on the processed image to achieve automatic container number identification. This invention is mainly used for identifying container numbers on front-mounted cranes.

A communication method includes: a terminal device acquires a measurement result for a first signal. The measurement result is used for determining a timing advance value of a first cell and / or a first spatial filter, and the first signal is a downlink reference signal related to a second cell and / or a second spatial filter.

The application provides a wharf docking method based on visual and laser radar fusion perception, a medium and equipment. The target pixel position of the docking and berthing area in a visual image can be determined according to the collected visual image. Then, the first coordinate of the center point of the docking and berthing area in a laser radar coordinate system is determined according to the target pixel position, the collected laser point cloud and a spatial filter. The first coordinate is subjected to coordinate conversion to obtain the second coordinate of the center of the docking and berthing area in a wharf coordinate system. The target joint parameters of the wharf are determined according to the second coordinate. The motion trajectory of the wharf is determined according to the target joint parameters. The motion trajectory is sent to a wharf control device to enable the wharf control device to perform corresponding wharf motion, so that the wharf is automatically guided and docked, the operation complexity of the wharf is reduced, the safety problems caused by limited field of view and improper operation of the operator are avoided, and the stability and accurate control in the automatic guiding process of the wharf are realized.

Aspects presented herein may enable a UE to determine QCL information and / or a spatial filter for non-dedicated channel and / or signal based on a unified TCI indication from a base station. In one aspect, a UE receives a TCI state indication in association with a communication of at least one non-dedicated DL channel or non-dedicated DL signal. The UE determines QCL information for the communication of the at least one non-dedicated DL channel or the non-dedicated DL signal based on one or more source reference signals for the received TCI state indication. The UE receives the at least one non-dedicated DL channel or the non-dedicated DL signal based on the received TCI state indication and the determined QCL information.

This invention discloses an adaptive spatial filtering method to reduce the false alarm rate in laser ranging. An adaptive spatial filtering module is introduced into the laser ranging system. A real-time sky background noise acquisition module detects changes in sky background light intensity and feeds this information back to the control system for immediate response. Based on the acquired control signals, a receiving field-of-view control module enables automatic control of a series of mechanisms and circuits. A variable aperture with adjustment function limits the background noise entering the laser ranging system; when the background light radiation intensity is high, the aperture diameter decreases, and vice versa. This design is simple in structure, easy to operate, stable, and highly automated. It not only balances the system's target acquisition capability and noise suppression capability but also has good adaptability, allowing for real-time, intelligent, and efficient adjustment of system structural parameters according to observation conditions, thereby improving system stability and automation.

The specification provides a speech enhancement method based on a dual microphone array, the method comprising: acquiring surrounding acoustic signals collected by two microphones in a microphone array respectively. Based on the acoustic signals collected by the two microphones respectively, coherence information between the two microphones is determined. Based on the coherence information, a speech activity state is judged, and in the case that the speech activity state is a speech missing state, a noise covariance matrix of the spatial filter is updated; and a gain function value of the post-filter is determined based on the coherence information. The two collected acoustic signals are subjected to beamforming processing by the spatial filter to obtain acoustic signals of at least one beam direction. The acoustic signals of any beam direction are subjected to filtering processing by the post-filter to obtain an estimation result of a speech component contained in the acoustic signals of the any beam direction.

The application discloses a diatom fossil image segmentation extraction method based on a radial contour pre-training ViT, which comprises the following steps: generating a radial contour geometric data set with a spatial organization rule, pre-training a ViT backbone network to obtain geometric prior features; loading the pre-training weight to a target detection framework, reconstructing a multi-scale feature pyramid through a feature adaptation module; fine-tuning the network by using a real diatom data set with polygon annotation and a multi-task joint loss function; inputting a to-be-processed microscopic image into a model to infer a binary mask, and performing pixel-by-pixel spatial filtering to extract a fossil monomer image. The application effectively eliminates complex microscopic background interference, and realizes high-precision segmentation and zero-background automatic extraction of diatom fossils.

The present application proposes a chest and abdominal respiration signal decoupling and reconstruction method based on millimeter wave radar. Using a millimeter wave multiple-input multiple-output radar device, the radar echo is first mapped to a three-dimensional space using 3D beamforming technology, mapping the one-dimensional time domain signal to a spatial energy heat map containing distance, azimuth, and elevation three-dimensional information. Then, through spatial filtering strategy, the physiological vibration source signal clusters of the subjects with coupling relationship are separated. When the physiological vibration source includes the chest reflection area of the first anatomical site and the abdominal reflection area of the second anatomical site, combined with the adaptive best point selection algorithm, according to the anatomical features of the human body, the chest reflection area and the abdominal reflection area are physically located and distinguished in the three-dimensional space, and the independent breathing waveform is extracted from the body surface reflection to perform high-precision spatial separation and anti-interference waveform extraction operation of chest and abdominal respiration movement. The present application can realize high-precision spatial separation and anti-interference waveform extraction of chest and abdominal respiration movement.

The application discloses a kind of high signal-to-noise ratio spectral confocal detection devices, comprising: light source and the first lens group of coaxial setting in turn, the transmission region of light splitting component and second lens group, for being used to guide the incident light emitted by light source to the surface of measured object after dispersion and focusing, and make the light of target wavelength form focusing spot, the light of non-target wavelength forms diffuse spot in different position with focusing spot;Second lens group, the reflection region of light splitting component, third lens group, first spatial filter structure and spectral acquisition unit are sequentially arranged according to reflected light path, for receiving the reflected light reflected by measured object, after reflection, focusing and filtering, into spectral acquisition unit to obtain spectral information.It combines the advantages of triangular structure and coaxial structure, can solve the problem that existing spectral confocal detection system is influenced by background light, leading to lower signal-to-noise ratio of obtained spectrum.

The present invention relates to a method for optically acquiring the features of an object, wherein the object is located at an object location and includes physical features in multiple dimensions, the object is optically accessible by an optical system, the optical system includes at least a first optical device with a first adjustable spatial filter for acquiring optical information along a first optical axis, a second optical device with a second adjustable spatial filter for acquiring optical information along a second optical axis, and an adjustment system capable of adjusting the acquisition angle between the first and second optical axes. The present invention further includes an operating device, an optical system, and operating the object with the operating system.

This invention relates to the field of spectroscopic instrument calibration technology, and discloses a spectral wavelength calibration method based on grating dispersion and spatial filtering, comprising: 1. incident collimated light from a broadband light source onto a grating; 2. setting a spatial filter that can move along the dispersion direction near the image plane of the dispersive optical path, and selecting narrowband light with different center wavelengths from the continuous spectrum by moving the filter; 3. for each filter position, measuring the center wavelength of the selected narrowband light using a high-precision spectrometer, and capturing a spot image using a detector array to be calibrated; 4. extracting the centroid pixel coordinates of the spot from the image; 5. fitting the wavelength and pixel coordinates to establish a calibration equation between the pixel coordinates and the wavelength. This invention does not overly rely on discrete standard light sources, can actively and continuously acquire high-density calibration points, the process is easy to automate, and the calibration accuracy is high, making it suitable for online calibration of miniaturized and integrated spectrometers.

This invention discloses a method and system for calculating the quantities of electromechanical engineering work, relating to the field of artificial intelligence technology. The method includes: constructing a comprehensive electromechanical pipeline model using a modular combination modeling strategy, resulting in several flow section area models; mapping the trimming boundaries of two-dimensional construction drawings onto the three-dimensional space of the comprehensive electromechanical pipeline model using reverse projection technology, establishing a dynamic projection coordinate system; selecting target pipelines from the flow section area models based on a multi-level spatial filtering engine and the dynamic projection coordinate system; performing non-destructive segmentation of the target pipelines using a parametric cutting actuator to obtain multiple target pipeline segments; and calculating the quantities of the target pipelines corresponding to each flow section area model using electromechanical engineering quantity calculation formulas to obtain the quantity information of each target pipeline segment. This method helps solve the problem that existing technologies cannot achieve free segmentation and accurate quantity calculation of comprehensive electromechanical pipeline models.

This invention discloses a filter aperture, a spatial filter, and a filtering method. The contact surface between the filter aperture and the incident light is planar, and the contact surface of the filter aperture is not perpendicular to the incident light. The filter lens has a light-transmitting inner hole, and the axis of the light-transmitting inner hole is aligned with the incident light. The spatial filter includes a laser input end, a filtering device, a laser transmission pipe, and a laser output end arranged sequentially. The filtering device has the filter aperture as described above. The incident laser is emitted towards the filter aperture and reflected after contacting the contact surface to a direction other than the original optical path. The incident laser enters the light-transmitting inner hole from the light inlet. The laser travels along a tapered aperture with a gradually decreasing diameter, allowing only the central low-pass component to pass through, thus achieving beam purification. The tapered inner wall allows off-axis light to be obliquely reflected / refracted, away from the focal point. The inner wall of the tapered aperture provides diffuse reflection and absorption, reducing secondary scattering back to the main beam.

The application belongs to the technical fields of electromagnetic wave regulation and control and microwave antenna, and discloses a multi-frequency-band multi-angle low-profile spatial filter, which comprises an upper-layer metasurface metal layer, a dielectric substrate layer and a lower-layer metasurface metal layer, the upper-layer metasurface metal layer and the lower-layer metasurface metal layer are etched on the upper and lower surfaces of the dielectric substrate layer and are symmetrically arranged, the upper-layer metasurface metal layer and the lower-layer metasurface metal layer are respectively composed of a plurality of identical metasurface units arranged in an array, each metasurface unit is combined by three groups of resonant units with different sizes, and each resonant unit comprises a circular ring resonant groove, a cross-shaped resonant groove and an X-shaped resonant groove. The application can work in multiple frequency bands while reducing the profile height, and realizes filtering of signals with different angles of incidence.

A method for an optical acquisition of physical features of an object with an optical system. The method includes aligning the optical system towards an object position so that a first and a second optical device of the optical system gain optical access to the object position, assessing the object with the first and the second optical device from a first perspective so that the first and the second optical device engage with the object along a first and a second optical axis from the first perspective, respectively, adjusting first and the second adjustable spacial filters to a defined spacial adjustment with a defined spacial adjustment parameter, deriving a distance between the optical system and the object from the defined spacial adjustment parameter so as to derive a first distance information between the optical system and the object, and acquiring at least one physical feature of the object.

The invention relates to a spatial filtering system (4) comprising: - at least one first spatial filter (8), each filter being arranged to attenuate noise in a predefined direction; - a second spatial filter (9), arranged to attenuate noise in an optimized direction defined in real time; - a filter selector (10), arranged to select an optimal spatial filter; - a voice activity detector (12) arranged to detect the target voice; at least one parameter of the second spatial filter (9) being recalculated when an output signal of the voice activity detector is equal to a first value representative of an absence of the target voice.

An apparatus (210) for transmitting and receiving data in a wireless communication system according to one embodiment is provided. The apparatus (210) is configured to receive a first message and / or a second message from another network entity. Further, the apparatus (210) is configured to determine one or more transmit spatial filters and / or one or more receive spatial filters and / or one or more beam directions; wherein the one or more transmit spatial filters and / or the one or more receive spatial filters are the same as, or derived by the apparatus (210) from, at least one initial spatial filter; wherein the one or more beam directions are the same as, or derived by the apparatus (210) from, at least one initial beam direction. Further, the apparatus (210) is configured to apply the one or more transmit spatial filters and / or the one or more receive spatial filters and / or the one or more beam directions on one or more downlink resources and / or one or more uplink resources.

A multi-class motor imagery brain-computer interface decoding method combining EEGNet and FBCSP includes: 1) segmenting the continuous EEG signals of the subject into single-test signals and using filter banks for sub-band filtering; 2) using the training data of all subjects to perform transfer learning training on EEGNet, and classifying the test data to obtain classification scores for all tasks; 3) based on the OVO strategy, training the test subjects' training data on FBCSP to obtain spatial filters for each sub-band and each pair of tasks, concatenating the training and test feature signals of all sub-bands for each pair of tasks after spatial filtering, using the former to train an SVM to classify the latter to obtain classification scores for each pair of tasks, and summing all scores for each task; 4) standardizing the score vectors obtained from EEGNet and FBCSP and summing them, with the maximum value corresponding to the task as the test signal label. This invention can improve the classification accuracy of BCI and promote its practical application.

This invention provides a light field microscopy imaging system based on rare-earth upconversion materials, comprising: a first light source, a second light source, a third light source, a spatial filtering module, a first dichroic mirror, a second dichroic mirror, a third dichroic mirror, an aperture, a multi-channel filtering module, an objective lens, a tube lens, a microlens array, and a sensor. Light of different wavelengths emitted from the first, second, and third light sources is transmitted through the spatial filtering module to the corresponding first, second, and third dichroic mirrors. The first, second, and third dichroic mirrors are spatially aligned and beam-combined through the aperture. The combined three-color light sources are focused into the objective lens to achieve wide-field illumination. The rare-earth upconversion material-labeled sample is excited and transmitted through the multi-channel filtering module to the tube lens to form an image. The microlens array is located at the focal point of the tube lens, and the sensor is located at the focal length of the microlens array for recording the three-color imaging of the sample.

This invention belongs to the field of diffuser sheets for HUD display systems, and particularly relates to a fabrication apparatus and method for a uniform holographic diffuser sheet. The fabrication apparatus includes a 325nm He-Cd laser, a dual-beam superposition exposure optical path, a 4F spatial filtering system, and a photolithography receiving device. The dual-beam superposition exposure optical path includes a laser beam expander, a beam splitter, a reflector, and a source diffuser. The laser beam expander expands the ultraviolet laser beam, which is then split by the beam splitter to obtain two beams of equal energy. The reflector then illuminates the same position on the same surface of the source diffuser. The 4F spatial filtering system receives the scattered light emitted from the source diffuser and performs spectral filtering. The filtered scattered light is then illuminated by the photolithography receiving device. This invention can manufacture holographic diffusers with a uniformly distributed scattered light field, improving display quality and the energy utilization rate of the HUD system.

Methods and apparatuses for radio frequency exposure mitigation. A method for a user equipment (UE) to transmit a first channel includes receiving first information for a first downlink reference signal (DL RS) and a set of numbers of repetitions. The method further includes determining a first reference signal received power (RSRP) value for the first DL RS, a first spatial filter corresponding to the first DL RS, a first exposure value for the first spatial filter, and a first number of repetitions from the set of numbers of repetitions based on the first RSRP value and the first exposure value. The method further includes transmitting the first channel with the first number of repetitions using the first spatial filter.

The application belongs to the technical field of measuring equipment, and particularly relates to an imaging collection system based on axial distribution of multiple light spots and a collection method thereof. The imaging collection system comprises an objective lens, a slit spatial filter array, a prism array, a focusing lens array, a fiber array and a photodetector array. The objective lens collects light emitted by each light spot in the axial direction of the optical axis, so that light spots at different positions are conducted to the prism array through the slit spatial filter array, converged through the focusing lens array, conducted to the photodetector array through the fiber array, and the photodetector array detects the light signal intensity of the light spots. The application can eliminate the problems of crosstalk and stray light among the light spots, and according to different axial light spot positions, the corresponding prisms in the prism array are irradiated and then conducted and collected, effective separation of each light spot and detection of the light signal intensity are realized, and the precision and accuracy of signal detection are improved while maximizing the light collection efficiency.

This application discloses a broadband constant intensity spectrophotometer based on optical wedge spatial filtering and its implementation method, belonging to the field of precision optical analysis instruments. Addressing the problems of spectral interference oscillation, time-varying nonlinearity of the light source, and weak anti-interference in traditional spectrophotometers, this invention achieves full-spectrum constant intensity locking through triple innovation in optics, electronics, and algorithms. It employs an optical wedge spatial filtering structure to eliminate interference, combines optical chopping with FPGA digital phase-locked amplification to improve anti-interference, and utilizes a heterogeneous architecture of MCU and FPGA to carry a model predictive control algorithm, integrating feedforward compensation and Kalman filtering to achieve full-spectrum constant intensity locking. This invention is compatible with single / dual-beam architectures, enabling hardware reuse. It employs a dual approach of active intensity control and post-error correction to improve accuracy, achieving high-precision and high-stability detection across a broadband spectrum of 190nm-1100nm, with baseline flatness better than ±0.0005Abs and intensity drift rate less than 0.0003Abs / h.

The present disclosure relates to a light beam adjusting device, a laser system and a light beam adjusting method. The light beam adjusting device comprises: a spherical lens configured to converge a first light beam to generate a second light beam; a cylindrical lens group located on an outgoing light path of the spherical lens and having an acting direction being one of a first direction and a second direction, the cylindrical lens group being configured to adjust the second light beam to generate a third light beam; and a spatial filter located on an outgoing light path of the cylindrical lens group and configured to filter the third light beam to generate a fourth light beam.

The audio device includes a receiver 201 configured to receive a set of input audio signals. An audio beamformer 101 performs beamforming by combining the outputs of filters. A feedback circuit 103 includes a set of matching filters having a complex conjugate frequency response, and a beamform adapter 105 adapts the filters in accordance with a comparison between the input audio signal and the feedback audio signal. A fitting coefficient processor 207 determines decorrelation coefficients for a set of spatial decorrelation filters that produce a decorrelated output signal from the input audio signal, and the decorrelation coefficients are adapted based on the input signal. Sets of spatial filters 205, 301, and 401 are configured to apply spatial filtering to the input audio signal or the feedback signal, and the sets of spatial filters have coefficients determined from the decorrelation coefficients.

This invention discloses a method for generating a main flight path based on the spatial relationship of seedling points under orthophoto photography, belonging to the field of agricultural engineering and intelligent navigation technology. This invention uses the set of seedling point coordinates extracted from orthophotos as input, and combines a dynamic search radius mechanism and a direction constraint strategy to gradually generate a continuous and reasonable main flight path. The system includes a seedling point identification module, a spatial filtering module, a direction constraint module, and a path generation module. The main flight path generated by this invention enables the main walking mechanism of the equipment to be precisely positioned between crop rows, while its arm-reaching working mechanism covers a preset number of crop rows. Furthermore, it directly uses the actual seedling point coordinates extracted from orthophotos as the basis for path generation, maximizing the fit between the actual growth positions of the crops. This allows the walking mechanism of the agricultural equipment to accurately traverse between seedling points, effectively avoiding the crop root area, significantly reducing the risk of damage to crops from the equipment wheels, and improving the safety of field operations.

Simultaneous reception beam sweep procedures for multiple TRPs A wireless device (10) receives configuration information from one or more nodes (100, 240) of the wireless communication network. Based on the configuration information, the wireless device (10) simultaneously performs multiple beam sweep procedures. Each of the beam sweep procedures is based on measurements of reference signals from a respective transmission and reception point (TRP) of the wireless communication network using at least two different spatial filters for reception processing of the reference signal.

This invention relates to the field of stroke hand function rehabilitation technology, and more particularly to a smart training health data assessment system for stroke hand function rehabilitation. The system includes: a data acquisition and mapping module, a spatial filtering module, a spatiotemporal separation module, a template alignment module, a training adjustment module, and a safety monitoring module. The data acquisition and mapping module acquires multi-channel electromyographic signals of the hand and forearm target muscle groups of stroke patients and establishes a mapping between the acquisition area and the target muscle groups. The spatial filtering module performs spatial filtering on the acquired signals. The spatiotemporal separation module extracts spatiotemporal coordination patterns of the hand and adaptively adjusts the number of coordination patterns. The template alignment module spatially aligns the coordination patterns and calculates scores. The training adjustment module adjusts training parameters, and the safety monitoring module monitors safety indicators. In this invention, the system achieves a complete closed loop of health data assessment and training adjustment, improving the problems of disconnect between assessment and training needs and insufficient adaptability caused by traditional single signal acquisition or offline assessment.