169 results about "Raster scan" patented technology

The invention discloses a raster scanning correction method and system for an electromagnetic MEMS micromirror, and belongs to the technical field of raster scanning correction, and the method comprises the steps: collecting the real-time three-axis attitude information of an electromagnetic MEMS micromirror product in a three-dimensional space, and the fast and slow axis piezoresistive signals of the micromirror; carrying out PID control by taking the angle difference value as an error signal, outputting a driving voltage of a fast axis and a slow axis of the MEMS micro-mirror after the scanning view field correction, and further mapping to obtain a correction angle of micro-mirror scanning; and taking the correction angle as the input of PID control, and correcting the rotation angle of the micromirror by minimizing the tracking error between the rotation angle of the micromirror and the correction angle. Three-axis attitude information of an electromagnetic MEMS micro-mirror product is collected, and an angle difference value between the three-axis attitude information and standard three-axis attitude information is introduced into PID control to adjust a fast-slow axis driving signal, so that the rotation angle of the micro-mirror is corrected, and correction and compensation of grating distortion in grating scanning are realized. And the accuracy of the reconstruction quality of the three-dimensional point cloud is ensured.

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.

The present disclosure relates to a fabrication and evaluation process for testing new metallic alloy chemistries and compositions for laser powder bed fusion (L-PBF). The new methodology is efficient and effective for new compositions with a minimal investment of generating large quantities of powder feedstock for required in conventional AM processing. The method allows for subsurface melting of the new alloy composition by varying the depth of penetration by a control of the input power level, power deposition rate, and rastering scan strategy. Post-mortem analysis of the subsurface microstructure permits an analysis of the durability and suitability of the new metallic alloy for this manufacturing mode. The method utilizes available infrastructure, technology, and characterization techniques.

A laser irradiation method includes causing a first deflector to deflect a laser beam, causing a second deflector to raster-scan an object with the laser beam deflected by the first deflector, the object having an irradiation region and a non-irradiation region separated from the irradiation region, and causing the first deflector to deflect the laser beam, which is moved to the non-irradiation region by the second deflector, to the irradiation region to irradiate the irradiation region with the laser beam.

The invention discloses a large-aperture grating scanning etching period error suppression method based on frequency domain analysis. The method comprises the following steps: S1, forming a path function # imgabs0 #; s2, the removal amount distribution # imgabs 1 # is calculated; s3, performing power spectrum density analysis to obtain a spectrum amplitude; s4, extracting a frequency # imgabs2 #; s5, the scanning line spacing # imgabs4 # under the frequency # imgabs3 # is calculated; s6, a new scanning path # imgabs5 # is formed; s7, processing the large-aperture grating sample piece; and S8, judging whether the large-aperture grating sample piece meets the requirement or not, if so, ending and exiting, otherwise, extracting the frequency spectrum amplitude of the frequency distribution of which the error is higher than the drawing error in the frequency spectrum, and skipping to execute the step S4. The invention aims to solve the problems that the existing large-aperture scanning etching process is too low in efficiency and easy to generate sputtering pollution, and the processing efficiency and the processing quality of the large-aperture optical element are improved.

A method for decoding video includes receiving a frame of the video that includes at least one slice and at least one time. Each of the at least one slice and the at least one tile are not all aligned with one another. Each of the at least one slice is characterized that it is decoded independently of the other the at least one slice. Each of the at least one tile is characterized that it is a rectangular region of the frame and having coding units for the decoding arranged in a raster scan order. The at least one tile of the frame are collectively arranged in a raster scan order of the frame.

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.

Provided are an encoding device, a decoding device, an encoding method, and a decoding method. The encoding device includes: a circuit; and a memory connected to the circuit, the circuit encoding second information indicating whether or not first information is present in a bitstream, the first information being information pertaining to a sub-picture that is a rectangular region within a picture, and when the second information indicates that the first information is present in the bitstream, the second information being information pertaining to a sub-picture that is a rectangular region within the picture. For each of a plurality of slices constituting the picture, a sub-picture index indicating a sub-picture to which the slice belongs is encoded, and a rectangular slice different from a raster scan slice configured from a plurality of tiles consecutive in a raster scan order is used for the slice.

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.

The monochromator comprises a base, a supporting seat, a grating assembly, a posture adjusting mechanism and a sine mechanism, the supporting seat is movably arranged on the base, the grating assembly comprises a grating, the grating is arranged on the supporting seat, the posture adjusting mechanism is arranged on the supporting seat and connected with the grating, and the sine mechanism is arranged on the supporting seat and connected with the grating. The posture adjusting mechanism is used for adjusting the posture of the grating, and the sine mechanism is arranged on the base, connected with the grating and used for controlling the grating assembly to rotate relative to the supporting base. According to the monochromator provided by the embodiment of the invention, the movable supporting seat, the posture adjusting mechanism and the sine mechanism are arranged, so that the grating posture and grating scanning can be accurately and quickly collimated, the efficiency and precision of the grating posture and grating scanning can be improved to a certain extent, and data collected by the monochromator in a subsequent test is more accurate.

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.

An image encoding / decoding method and apparatus are provided. The image decoding method may comprise determining a decoding order of a plurality of slices within a current picture and decoding the plurality of slices based on the determined decoding order. Based on the decoding order of the plurality of slices being determined to be a different order from a raster scan order, a left neighboring slice located on a left side of a current slice within the current picture and a top neighboring slice located above the current slice may be restricted to precede the current slice in decoding order.

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 present invention belongs to the field of high-speed communication, and discloses a multi-mode high-speed optical communication method, system and device based on an underwater mobile platform. First, the FPGA control of the two communicating parties outputs ultra-short electrical pulses, and the laser is driven by the modulation circuit to emit high-energy pulsed lasers. The laser enters the water channel for raster scanning emission, and the camera spot coordinate position is calculated by MPPC or ARM, and the off-target amount is extracted, and the pan-tilt is controlled to align with the other party, and the pulse light is emitted while the maximum received signal is obtained to allow the other party to receive, and the rough alignment is completed; then the galvanometer is controlled to perform pointing fine alignment, while maintaining the fine tracking state, and the FPGA communication is started for processing, and finally the FPGA stops running after receiving the data stream or issuing a stop communication instruction, and the communication ends. The method disclosed in the present invention can realize that the AUV can communicate with the mother boat or (or fixed platform) in real time during movement, and establish an interactive system, which can be applied to the high-speed communication field between AUV and submersibles, between submersibles, etc., and between underwater mobile devices.

The present invention discloses a parameter error calibration method for an electron probe microanalysis instrument. A one-dimensional grating standard template is prepared based on atomic lithography technology, and the theoretical grating period D of the one-dimensional grating standard template is calculated. The one-dimensional grating standard template is placed on the stage of the electron probe microanalysis instrument for a set time to maintain a stable test state. After the electron probe microanalysis instrument is clearly focused, the electron probe microanalysis instrument scans the one-dimensional grating standard template on the stage, captures and measures the grid spacing of the one-dimensional grating standard template, obtains a grating scanning distance measurement value L, and records the magnification at this time. Based on D and L, a calibration factor K at this magnification is calculated. The parameter error calibration method for an electron probe microanalysis instrument of the present invention shortens the traceability chain length for calibrating the instrument, reduces error accumulation in the measurement value transfer process, improves calibration consistency between different instruments, and is easy to operate.

The present application discloses a method for calibrating a parameter error of an electron probe microanalysis instrument. A one-dimensional grating standard template is prepared based on atom lithography technology. A theoretical grating period D of the one-dimensional grating standard template is calculated. The one-dimensional grating standard template is statically placed on a stage of the electron probe microanalysis instrument. The electron probe microanalysis instrument scans the one-dimensional grating standard template on the stage, performs image acquisition and measurement on a grid distance of the one-dimensional grating standard template to obtain a grating scanning distance measurement value L, and records a magnification ratio at this time. A calibration factor K under the magnification ratio is calculated according to D and L. The present application shortens the length of the traceability chain for calibrating the instrument, reduces the error accumulation in the quantity value dissemination process.

A method and an apparatus for encoding or decoding a video are provided wherein flexible scanning of the blocks is used. A scanning path is determined for scanning blocks of at least one part of a picture among at least a raster scan order and a z-scan order, and the at least one part of the picture is encoded or decoded following the scanning path.

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.

Systems and techniques are described herein for processing video data. For instance, a process can include obtaining first encoded data for a first portion of an image, the image encoded in a plurality of independently decodable portions. The process can further include generating first intermediate data for the first portion of the image, storing the first intermediate data in a bitstream order, obtaining second encoded data for a second portion of the image, generating second intermediate data for the second portion of the image, storing the second intermediate data in the bitstream order, wherein the first intermediate data is stored separate from the second intermediate data, processing the first intermediate data and the second intermediate data in a raster scan order across the first portion of the image and the second portion of the image to generate a part of the image.

An optical coherence tomography system that quickly traverses its respective scan pattern and typically completes the entire two-dimensional frame faster than a conventional grating scanner completes one grating segment. To quickly traverse the scan pattern, the system performs fewer A-scans per unit scan pattern length than conventional OCT scanners. To compensate for the sparsity of sampling points along the respective scan line segments and gaps between the respective line segments of the compensation trajectory, the system acquires and combines several partially overlapping frames for each application.

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.