70 results about "Raster scan" patented technology

The invention discloses a limb volume measuring instrument, which relates to the field of limb volume measurement and comprises a supporting groove, a sliding rod, a pulley trolley, a measuring frame, an infrared measuring grating and host equipment, the host equipment comprises a server; the server is used for sending a scanning signal to the infrared measurement grating; the infrared measurement grating is used for scanning the limb to be measured under the driving of the pulley trolley after receiving the scanning signal to obtain an infrared light signal; the server is also used for reading a group of infrared light signals scanned by the infrared measurement grating at set time intervals and storing each group of infrared light signals according to a time sequence; after the infrared measurement grating completely scans the limb to be measured, the length and width data of the section of the corresponding limb to be measured are calculated according to each group of stored infrared light signals; and inputting the length and width data of the to-be-measured limb section corresponding to all the infrared light signals into the volume error correction model to obtain corrected length and width data. The limb volume can be simply, conveniently and accurately evaluated.

A spiral magnetorheological polishing method for mid-frequency error control is provided, relating to the technical field of optical polishing. The method includes: scanning along a polishing path by using a magnetorheological polishing method, and removing a material in a spiral manner with a polishing tool to achieve spiral magnetorheological polishing of a workpiece. An angle between a scanning direction and a workpiece material removal direction is changed in real time during scanning, to alter a spatial posture of a removal function on a polishing surface in a spiral manner, thereby reducing mid-frequency errors. The method further includes: during scanning, randomly changing a processing line spacing in real time to further achieve suppression of mid-frequency ripple errors. A scanning strategy employs raster scanning processing; when the scanning strategy employs raster scanning processing, the processing line spacing is a raster scanning spacing.

This invention discloses a radar scanning device and method based on cascaded dual-phase plates. The device includes: a laser generator, a first phase plate, and a second phase plate; the light output end of the laser generator is aligned with the first phase plate, and the laser generator is used to generate an initial light signal; the first phase plate has a first phase distribution etched on its side away from the laser generator, and the first phase plate is used to perform a first-level modulation processing on the received initial light signal to obtain a first light signal; the second phase plate has a second phase distribution etched on its side facing the first phase plate, and the second phase plate is used to perform a second-level modulation processing on the received first light signal to obtain a two-dimensional grating scanning beam; wherein, the first phase distribution and the second phase distribution are designed to generate a corresponding two-dimensional grating scanning beam based on the phase difference between them, thereby enhancing the flexibility and stability of the lidar scanning system.

We present a ground-based laser system for searching, ranging, and tracking that actively illuminates small resident space objects (RSOs) in low Earth orbit (LEO) and observes position and transit-time of reflections, enabling orbital custody of most one-to-few centimeter-sized objects. A diode-pumped alkali laser (DPAL) augmented with mode-locking and Q-switching serves as an illuminator and offers exceptionally high spectral brightness due to its output beam's sub-nanosecond pulse duration and picometer-level spectral linewidth. Kilohertz fast-rastering enables interrogations of distinct few-meter-sized sky-patches at megahertz rates. Paired on the observation side with one or more telescopes outfitted with Faraday anomalous dispersion optical filters (FADOFs), image intensifiers, multi-pixel arrays, and nanosecond timing, the combined system could offer nearly background-free discoveries of RSOs every hour, even during daytime. Periodically re-flashing previously discovered objects to maintain orbit custody expends only a small fraction of total observing time.

The present invention relates to the technical field of data processing, and in particular to a method and apparatus for evaluating the service life of a furnace tube, and a device and a medium. The method comprises: acquiring a furnace tube high-temperature plasticity evaluation model, wherein the furnace tube high-temperature plasticity evaluation model is obtained by means of training based on high-temperature plasticity data of historical furnace tubes; using a crawling robot to acquire a surface image, an electromagnetic testing result and a raster scanning result of a target furnace tube; on the basis of the surface image, the electromagnetic testing result and the raster scanning result, determining the degree of oxidation, carburization data and the degree of deformation at different height positions on the target furnace tube; on the basis of any two or more types of the above data and the furnace tube high-temperature plasticity evaluation model, determining plasticity results at different height positions on the target furnace tube; and finally evaluating the remaining service life of the target furnace tube. A prediction model is trained on the basis of data pertaining to three causative factors, i.e., carburization, deformation and oxidation of furnace tubes, such that the prediction model can accurately predict the plasticity of an in-service furnace tube, so as to evaluate the remaining service life of the furnace tube.

Input pixel data having first, second and third channel data for each pixel of a block of data is received in raster scan order and is compressed in raster scan order using a block-based encoding scheme. The compressed pixel data is then output in raster scan order.

Techniques for performing a cell search for the presence of multiple cells in a frequency band are described. Each frequency band is segmented into sub-bands, each sub-band covering more than one raster scan (e.g., 100 kHz). Each segment has a predetermined center frequency for RF tuning. The number of tunable RF center frequencies can be equal to the number of segments in a frequency band. The techniques include obtaining IQ signals in a digital domain at a predefined RF center frequency. Further, the techniques include computing a matched filtering of PSS sequence with IQ samples of sub-bands with a predefined and predetermined waveform through matched filtering, and averaging correlations for smoothing the peaks that exceed a predetermined threshold to detect or reject the presence of a cell.

Systems and methods of microscopy include and / or apply a laser light source configured to produce an excitation light; a modulator configured to modulate the excitation light to produce a modulated light; a pulse compressor configured to compress a pulse of the modulated light to produce a pre-compensated light; a beam scanner configured to raster scan the pre-compensated light on a sample; a detector configured to receive a light signal from the sample and produce a detection signal; and a lock-in amplifier configured to receive the detection signal and perform an electronic heterodyne amplification of the detection signal.

The application relates to the technical field of communication, in particular to a chaotic image encryption method based on global dynamic selection, which has the technical scheme as follows: S1, generating a chaotic sequence used in the encryption method by using a 2D-LSM chaotic system; S2, expanding an image into a one-dimensional array through raster scanning; S3, dynamically DNA encoding the image to convert the one-dimensional array into a DNA matrix; S4, dynamically permuting the DNA matrix to obtain a permutation image; S5, DNA decoding the permutation image to obtain a DNA decoding matrix; S6, dynamically diffusing and encrypting the DNA decoding matrix to obtain an encrypted image; and S7, repeating steps S2-S6 to repeatedly encrypt the encrypted image as an initial image. The method has the advantages of high flexibility and selectivity.

The invention relates to the technical field of spectral analysis, and discloses a miniaturized spectrum sensing system and method based on MEMS raster scanning, and the system comprises an optical input module which is used for receiving to-be-measured light; the collimating optical element is used for collimating the light to be measured to form parallel light beams; the MEMS grating scanning micromirror is used for carrying out dispersion light splitting on the parallel light beams; the focusing optical element is used for focusing the incident light to form to-be-measured optical signals with different wavelengths; the unit infrared detector is used for converting an optical signal to be measured into an electric signal; and the signal processing module extracts the intensity of the to-be-measured optical signal based on the electric signal, identifies the wavelength of the to-be-measured optical signal corresponding to the electric signal, binds the wavelength and the intensity of the to-be-measured optical signal, and draws a spectrogram. According to the invention, the micro-nano optical surface is integrated by using the micro-electro-mechanical system, and the high-performance unit infrared detector is combined, so that high-precision and miniaturized measurement of the infrared spectrum is realized, and the anti-error capability of raster scanning is improved.

A video coding mechanism is disclosed. The mechanism includes partitioning a picture into a plurality of tiles. A number of the tiles are included in a tile group. A flag is also encoded into a parameter set of a bitstream. The flag is set to a first value when the tile group is a raster scan tile group and a second value when the tile group is a rectangular tile group. The tiles are encoded into the bitstream based on the tile group. The bitstream is stored for communication toward a decoder.

A MEMS scanning device (“Device”) includes at least (1) laser projector(s) controlled by a laser drive to project a laser beam, (2) MEMS scanning mirror(s) controlled by a MEMS drive to scan the laser beam to generate a raster scan, (3) a display configured to receive the raster scan, (4) a thermometer configured to detect a current temperature, (5) a display observing camera configured to capture an image of a predetermined area of the display, and (6) a computer-readable media that stores temperature model(s), each of which is custom-built using machine learning. The device uses the display observing camera to capture image(s) of predetermined pattern(s), which are then used to extract feature(s). The extracted feature(s) are compared with ideal feature(s) to identify a discrepancy. When the identified discrepancy is greater than a threshold, the temperature model(s) are updated accordingly.

A method for decoding a picture from a bitstream. The method includes decoding a tile partition structure from one or more syntax elements in the bitstream. The method includes determining a number of tiles N in the picture. The method includes decoding a number of partitions in the picture, wherein each partition comprises an integer number of tiles. The method includes deriving a size and / or location for a current partition, wherein deriving the size and / or location for the current partition comprises: decoding one or more location syntax elements for the current partition from the bitstream, deriving a top-left position of the current partition as a location of a first tile in raster scan order that is not included in one or more previously derived partition, and deriving the size and / or the location of the current partition from a value of the one or more location syntax element together with a size and / or location of the one or more previously derived partition. The method includes using the derived size and / or location to decode the picture.

The application relates to the technical field of spectral analysis, and discloses a miniaturized spectral sensing system and method based on MEMS grating scanning, which comprises the following: an optical input module for receiving to-be-detected light; a collimating optical element for collimating the to-be-detected light to form a parallel light beam; a MEMS grating scanning micromirror for dispersing and spectrally analyzing the parallel light beam; a focusing optical element for focusing the incident light to form to-be-detected light signals of different wavelengths; a single infrared detector for converting the to-be-detected light signals into electrical signals; and a signal processing module for extracting the intensity of the to-be-detected light signals based on the electrical signals, identifying the wavelengths of the to-be-detected light signals corresponding to the electrical signals, thereby binding the wavelengths and the intensity of the to-be-detected light signals, and drawing a spectral graph. The application utilizes a micro-electro-mechanical system integrated micro-nano optical surface, combines a high-performance single infrared detector, realizes high-precision and miniaturized measurement of infrared spectrum, and improves the error resistance of grating scanning.

Approaches, apparatuses and methods for single photon sensitive, non-interferometric photonics vibrometry applications based on quantum parametric mode sorting, optical gating and single photon counting are disclosed. In one embodiment, a controller module includes a photon detection unit, a pulse generator unit, a time synchronization unit, a data acquisition and processing unit and a central controller unit. In the second embodiment, a probe module with beam raster scanning ability includes an optical transceiver unit based on a bidirectional monostatic coaxial arrangement using off-the-shelf optical components and an optical beam steering device.

A method for decoding a picture from a bitstream. The method includes decoding a tile partition structure from one or more syntax elements in the bitstream. The method includes determining a number of tiles N in the picture. The method includes decoding a number of partitions in the picture, wherein each partition comprises an integer number of tiles. The method includes deriving a size and / or location for a current partition, wherein deriving the size and / or location for the current partition comprises: decoding one or more location syntax elements for the current partition from the bitstream, deriving a top-left position of the current partition as a location of a first tile in raster scan order that is not included in one or more previously derived partition, and deriving the size and / or the location of the current partition from a value of the one or more location syntax element together with a size and / or location of the one or more previously derived partition. The method includes using the derived size and / or location to decode the picture.

Systems and methods for imaging samples with reduced sample motion artifacts are disclosed. Compared to conventional raster scanning, scanning patterns that reduce the acquisition time difference between acquiring peripheral pixels in adjacent tiles can reduce or eliminate sample motion artifacts, thereby reducing or eliminating discontinuities that would otherwise appear at tile boundaries in an image. In some embodiments, the intensity of a test image acquired using a relatively small test scan pattern or test points acquired at different times can be compared to determine whether sample motion has occurred. In some embodiments, the intensity of adjacent pixels at tile boundaries is compared. In some embodiments, the intensity of one or more individual pixels is monitored over time to determine whether sample motion has occurred over a period of time. In some embodiments, a planarization or reshaping tool can be used during imaging to suppress sample motion.

This invention relates to the field of automotive parts processing, specifically disclosing an intelligent control method for the intermediate coating process of new energy vehicle body panels. This method is applied to a 7-axis painting robot equipped with a high-voltage electrostatic rotary cup, a seventh-axis walking guide, and a vision system. The method includes the following steps: S1. Installing a structured light grating module on the wrist of the 7-axis painting robot near the high-voltage electrostatic rotary cup; S2. Obtaining the model information of the new energy vehicle body panel to be painted and the mounting trigger information of a preset mounting frame, controlling the structured light grating module to perform grating scanning on the entire surface of the body panel, acquiring a first image containing three-dimensional surface information, and simultaneously acquiring a second image of the two-dimensional texture of the body panel surface; S3. Performing multi-scale wavelet transform on the first image. The technical solution of this invention can detect defects in the primer coating process, locate potential points affecting the adhesion of the intermediate coating, and ensure the adhesion stability and integrity of the intermediate coating film.

Systems and methods of identifying and / or reducing or eliminating sample motion artifacts are disclosed. Sample motion artifacts can be reduced or eliminated using a scan pattern that reduces the difference in acquisition time between acquisition of the peripheral pixels in adjacent tiles compared to a conventional raster scan, thereby reducing or eliminating discontinuities that would otherwise occur at tile boundaries in the image. In some embodiments, the intensity of test images acquired using a relatively small test scan pattern or test points acquired at different times can be compared to determine whether sample motion has occurred. In some embodiments, the intensity of adjacent pixels at a tile boundary are compared. In some embodiments, the intensity of one or more single pixels is monitored over time to determine whether sample motion has occurred over a period of time. In some embodiments, a flattening or reshaping tool can be used during imaging to suppress sample motion.

The present application belongs to the field of scanning electron detection imaging, and relates to a deflection detection system, a deflection detection method and a scanning electron microscope. A Wien filter is arranged in the electron lens barrel of the present application. The Wien filter is excited by an alternating signal to generate a deflection electric field and a deflection magnetic field which are perpendicular to each other. The electric field force and the magnetic field force generated by the Wien filter are opposite to the main electron beam going downward, and the electric field force and the magnetic field force generated by the Wien filter are the same as the secondary electron going upward, so as to form an off-axis resultant force. The alternating excitation signal of the Wien filter is configured to be synchronous with the grating scanning signal of the deflector, and the frequency and the phase are maintained in a specific relationship. When the main electron beam scans to the center of the row / frame, the excitation signal is enhanced, and when the main electron beam scans to the edge of the row / frame, the excitation signal is weakened. The present application solves the problem that the signal electrons near the optical axis miss the detector, reduces the coverage requirement of the detector, solves the contradiction between the sampling frequency and the field of view, improves the signal-to-noise ratio of the image, and improves the imaging rate or the detection rate.

A spiral magnetorheological polishing method for mid-frequency error control is provided, relating to the technical field of optical polishing. The method includes: scanning along a polishing path by using a magnetorheological polishing method, and removing a material in a spiral manner with a polishing tool to achieve spiral magnetorheological polishing of a workpiece. An angle between a scanning direction and a workpiece material removal direction is changed in real time during scanning, to alter a spatial posture of a removal function on a polishing surface in a spiral manner, thereby reducing mid-frequency errors. The method further includes: during scanning, randomly changing a processing line spacing in real time to further achieve suppression of mid-frequency ripple errors. A scanning strategy employs raster scanning processing; when the scanning strategy employs raster scanning processing, the processing line spacing is a raster scanning spacing.

A method and apparatus for signaling or parsing picture partition information are disclosed. According to one method, a syntax related to a number of tiles in a target slice is signaled at an encoder side or parsed at a decoder side if the address of the target slice does not correspond to a last tile index of the current picture and the raster-scan slice mode is used for picture partition. The syntax is signaled or parsed from a slice header level of the video bitstream corresponding to the target slice. According to another method, a control syntax is signaled at an encoder side or parsed at a decoder side only if the picture partition information indicates more than one tile existing in the current picture. The control syntax indicates whether in-loop filtering is applied across tile boundaries.

The invention relates to an optical device (100) for a polarisation lidar system (200), to a method, to a polarisation lidar system (200), to a computer program product, and to a signal processing unit (70). The device comprises an optical transmitting unit (10) for emitting a pulsed, polarised light beam (14) for rasterised scanning of an environment (110) and an optical receiving unit (30) having photodetectors for receiving a backscattered light beam (36). The receiving unit (30) determines an intensity of the backscattered light beam (36) in two polarisation planes. A signal processing unit (70) processes signals from the photodetectors. The signal processing unit (70) is designed to simultaneously generate, from the same signals, both spatial information of the environment (110) from a temporal correlation of the pulsed light beam (14), and the backscattered light beam (36), and to determine a polarisation of the backscattered light beam (36) at least for localising and / or classifying an aerosol or a plurality of aerosols.

This document discloses a method for performing multiple operations within a region of a part using an end effector of a robot, and a robot performing the method. The method includes collecting a spatial representation of the part and aligning a predetermined raster scan pattern for movement of the end effector relative to the part with the spatial representation of the part. The method further includes defining multiple normal vectors for the part at multiple predetermined operating positions for end effector operations. The method also includes moving the end effector relative to the part and along the predetermined raster scan pattern. The method further includes orienting the end effector such that an operating device of the end effector faces each operating position along a corresponding normal vector and performing a corresponding operation among the multiple operations using the operating device.

The invention provides a GPU (Graphics Processing Unit) fragment stream processing method, which comprises the following steps that: in a graphic rendering pipeline, after series coordinate conversion, primitives in a scene body are sent to a Raster for rasterization scanning, and the Raster scans and outputs the primitives according to a row mode on the basis of the input sequence of the primitives; distributing the plurality of fragments subjected to rasterization scanning to a plurality of shaders for coloring; the colored fragments are sequentially sent to a plurality of ROP units according to the row mode for fragment operation processing, and each ROP unit carries out fragment operation processing on the fragments of the fixed row; and outputting the fragment pixels processed by each ROP unit according to a sequence, and writing the fragment pixels back to the frame buffer area through the fragment cache. According to the method, all processing is carried out according to the input sequence of the primitives when the primitives are subjected to rasterization scanning, fragment coloring, fragment operation and writing back to the frame buffer area, and all processing multifunctional components are completely independent, so that the sequence and data consistency in the processing process of numerous primitive fragments is ensured.

The invention relates to the technical field of micro electro mechanical system device application, in particular to a driving control method, device and equipment for an MEMS scanning micromirror and a medium, and the method comprises the steps: determining a target phase parameter according to a first resonant frequency of the current MEMS scanning micromirror in a first direction and a second resonant frequency of the current MEMS scanning micromirror in a second direction, determining a first target phase of the current MEMS scanning micromirror in the first direction and a second target phase of the current MEMS scanning micromirror in the second direction; and determining a first driving signal according to the first resonant frequency and the first target phase, determining a second driving signal according to the second resonant frequency and the second target phase, and performing driving control on the current MEMS scanning micromirror based on the first driving signal and the second driving signal. Therefore, the problems that an existing raster scanning mode is low in scanning speed, poor in vibration and impact resistance and inflexible in track fixation are solved, and high-speed, anti-interference and high-precision scanning with the track capable of being flexibly regulated and controlled of the MEMS scanning micromirror is achieved.

A method and apparatus for encoding or decoding a video are provided in which flexible scanning of blocks is used. A scan path for scanning blocks of at least one portion of a picture is determined at least among a raster scan order and a Z-type scan order, and the at least one portion of the picture is encoded or decoded following the scan path.

The invention relates to the technical field of biomedical imaging, in particular to a scanning imaging method for monitoring a blood vessel microenvironment after a flap transplantation operation, and the scanning imaging method is applied to a scanning imaging system. The system comprises a laser emission module, an optical transmission and focusing module, a scanning control module, a signal receiving module and a central control and processing unit, and the central control and processing unit is used for controlling all parts of the system to work cooperatively and processing image data and is configured to control the scanning control module. The scanning path presents a specific inclination angle relative to the sound field of the cylindrical ultrasonic transducer. According to the scanning imaging method for monitoring the blood vessel microenvironment after the flap transplantation operation, the uniformity of raster scanning and the high speed of rotary scanning are combined, and a depth-adjustable optical focusing mechanism is introduced; therefore, extremely high imaging efficiency, excellent image uniformity and flexible adaptability to skin flap depth are obtained.