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31 results about "Coherence factor" patented technology
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Coherence (units of measurement), a derived unit that, for a given system of quantities and for a chosen set of base units, is a product of powers of base units with no other proportionality factor than one.
Imaging system and method
InactiveUS20130083628A1Material analysis using sonic/ultrasonic/infrasonic wavesAcoustic wave reradiationUltrasound imagingSonification
A method of operating an ultrasound imaging system having an array of transducer elements. The method comprises transmitting a plurality of ultrasound signals, each transmission using a different sub-aperture of the array, receiving a plurality of reflected ultrasound signals by a receive array corresponding to each sub-aperture transmission, calculating a coherency factor corresponding to the proportion of coherent energy in the received signals from each sub-aperture transmission and weighting the received output by the calculated coherency factor, and synthesizing all weighted outputs under all different sub-aperture transmissions.
Owner:GE INSPECTION TECH LP
Method for self-adaptation ultrasonic imaging of spatio-temporally smoothed coherence factor type
ActiveCN103536316AIncrease contrastReduce noiseUltrasonic/sonic/infrasonic diagnosticsInfrasonic diagnosticsComputation complexitySonification
The invention discloses a method for self-adaptation ultrasonic imaging of a spatio-temporally smoothed coherence factor type. The method comprises the following steps that (1) beam forming preprocessing is conducted; (2) beam forming processing is conducted, wherein beam forming processing comprises the steps that delayed focusing is conducted on each channel received signal, a coherence factor value of the spatio-temporally smoothed coherence factor type is calculated according to the channel received signal after delayed processing, and weighted processing is conducted on the coherence sum of the received signals through coherence factors so that beams of each scanning line can be obtained and output; (3) beam forming post-processing is conducted, wherein beam forming post-processing comprises the steps that envelope detection, logarithm compression, scanning conversion and display are conducted on the scanning lines. According to the method for self-adaptation ultrasonic imaging of the spatio-temporally smoothed coherence factor type, side lobe can be restrained, sound disorder is reduced, the contrast ratio of an image is improved, an artifact is remarkably eliminated, the imaging quality is improved, the calculation complexity is low, and the method is easy to achieve in hardware.
Owner:维视医学影像有限公司
Well planning using seismic coherence
InactiveUS7280952B2Computation using non-denominational number representationSeismic signal processingCoherence factorGeophysics
A system for predicting hydrocarbon production from a subterranean region of interest using reflection seismic data. The system sets a drainage area around reference traces and defines drainage pathways extending outwardly from the reference trace towards the perimeter of the drainage area. A mathematical combination of the trace-to-trace coherence factors and reservoir quality attributes along each drainage pathway is calculated for each reference trace, thereby providing an indication of both initial and sustained hydrocarbon production from that location.
Owner:CONOCOPHILLIPS CO
Mask correcting method
InactiveUS20050164095A1Minimize the differenceImprove calibration accuracyPhotomechanical apparatusSemiconductor/solid-state device manufacturingPresent methodLine width
There is provided a method for correcting a photo mask, which allows the difference between a test mask and a corrected mask with respect to an error of line width depending on coarse / dense pattern to be decreased when the photo masks are corrected by optical proximity effect correction. The present method is consisted of: producing a test mask which acts as a mask for extracting process model for applying an optical proximity effect correction method (s1); transferring and measuring the dimensions of the transferred pattern using the test mask (s2 and s3); obtaining a function model (referred to as process model) of which a simulated result of the transferred pattern of a mask pattern of the photo mask using a function model matches the measured result (s4); obtaining a mask pattern of which a transferred pattern matches a designed pattern using said process model and creating mask data in accordance with the obtained mask pattern (s5); producing a corrected mask in accordance with the created mask data (s5); and setting an exposing condition where an OPE characteristic becomes flat with respect of wide and narrow pitches by adjusting at least one of a numerical aperture (NA) and a coherence factor (σ) of an exposing device when the corrected mask is transferred.
Owner:SONY CORP
Measurement method, measurement unit, processing unit, pattern forming method , and device manufacturing method
InactiveUS20080013090A1Improve productivityChange in measurement error of the mark positionPhotomechanical treatmentUsing optical meansLight beamPupil
A coherence factor σ of an alignment system is set to 1 or more, and positional information of a mark is detected from a photodetection signal that corresponds to the mark intensity image of the mark due to a zero order light and light of an odd order diffraction from the mark. When σ≧1, a beam pair of a zero order light and a light of +1st order diffraction appears without fail with respect to a beam pair of a zero order light and a light of −1st order diffraction that pass through the same two points on the pupil plane and the positional shift of the mark image caused by both pairs is canceled out, and by the change in mark step or aberration, the change in mark position shift amount is reduced. Accordingly, the mark can be detected with high precision.
Owner:NIKON CORP
High-seed super-resolution MIMO (multi input multi output) array imaging method
ActiveCN107390215ACalculation speedGuaranteed real-timeRadio wave reradiation/reflectionMulti inputParallel algorithm
The present invention discloses a high-seed super-resolution MIMO (multi input multi output) array imaging method. The method includes the following steps that: step 1, data sampling is performed on an MIMO array; step 2, an MIMO-RMA (range migration algorithm) is utilized to complete three-dimensional reflectivity image reconstruction; step 3, the acceleration of the MIMO-RMA is utilized to calculate a coherence factor; and step 4, the coherence factor corrects a reflectivity three-dimensional image. According to the imaging algorithm of the invention, reflectivity incoherent power is simplified by rearranging echo data, the acceleration of the MIMO-RMA is utilized to calculate the coherence factor, and the calculation speed of the coherence factor is greatly increased in combination with a parallel algorithm; super-resolution performance is balanced through controlling parameters alpha and beta according to a defect that the coherent factor suppresses weak scattering points, and at the same time, the stability of the algorithm is not affected; and the coherence factor is utilized to correct the reconstructed three-dimensional image, so that sidelobe and ground noises can be effectively suppressed, and higher resolution can be achieved.
Owner:JILIN UNIV
Ultrasound diagnostic device
InactiveUS20120277589A1Ultrasonic/sonic/infrasonic diagnosticsInfrasonic diagnosticsSonificationSignal correction
An ultrasound diagnostic device includes: an ultrasound probe which transmits ultrasound toward a tested subject by a plurality of transducers and obtains a received signal; a beam forming section for adding the received signal for each of the transducers with matching a phase of the received signal; an image processing section which generates an image data; a coherent factor calculation section which calculates a coherent factor which represents a ratio of a coherent sum to an incoherent sum; a coherent factor correction section which corrects the coherent factor so as not to be smaller than a predetermined value; and a signal correction section which correct the received signal after having been subject to the adding, by multiplying the received signal after having been subject to the adding by the coherent factor corrected by the coherent factor correction section as a coefficient.
Owner:KONICA MINOLTA MEDICAL & GRAPHICS INC
Method for correcting spherical aberration of a projection lens in an exposure system
InactiveUS20020075458A1ProjectorsSemiconductor/solid-state device manufacturingCoherence factorLength wave
A method for correcting a spherical aberration of a projection lens in an exposure system includes the step of measuring a best focus shift amount by using an exposure light passed by a half-tone phase shift mask having a specific configuration, and correcting the spherical aberration of the projection lens based on the best focus shift amount measured. The half-tone phase shift mask has therein an array of square hole patterns arranged at a pitch P and each having a pattern size of M, P and M satisfying the following relationships: <paragraph lvl="0"><in-line-formula>0.8lambd / (2xNA)<=M<=1.2lambd / (2xNA); < / in-line-formula><paragraph lvl="0"><in-line-formula>{lambd / (PxNA)}+sigma<=1; and < / in-line-formula><paragraph lvl="0"><in-line-formula>{2xlambd / (PxNA)}-sigma>=1, < / in-line-formula>wherein lambd, sigma and NA are wavelength and coherence factor of the exposure light and numerical aperture of the projection lens, respectively.
Owner:NEC ELECTRONICS CORP
Photolithographic illumination device using mercury lamp light source
InactiveCN102221785APromote conversionConversion not requiredPhotomechanical exposure apparatusMicrolithography exposure apparatusLight energyPupil
The invention discloses a photolithographic illumination device using a mercury lamp light source. The photolithographic illumination device comprises the mercury lamp light source, a reflective bowl, a pupil reshaping device, a dodging device, a condensation system and a mercury lamp position adjusting device, wherein the reflective bowl is used for converging light energy of a mercury lamp; the pupil reshaping device is used for generating continuous and variable pupils and converting illumination modes; the dodging device is used for acquiring better illumination uniformity; and the mercury lamp position adjusting device is used for changing coherence factors of rays emitted by the mercury lamp light source by moving the position of the mercury lamp to acquire a required illumination field. Through the illumination device provided by the invention, the illumination modes and the illumination coherence factors can be simply converted by using fewer elements, and the elements do not need to be changed.
Owner:SHANGHAI MICRO ELECTRONICS EQUIP (GRP) CO LTD
Coherence factor adaptive ultrasound imaging
InactiveCN1817309AUltrasonic/sonic/infrasonic diagnosticsMaterial analysis using sonic/ultrasonic/infrasonic wavesSonificationData acquisition
A set of NxM signals are acquired from an object, where N is the number of array elements and M corresponds to variations in data acquisition and / or processing parameters. The parameters include transmit aperture functions, transmit waveforms, receive aperture functions, and receive filtering functions in space and / or time. A coherence factor is computed as a ratio of the energy of the coherent sum to the energy of the at-least-partially incoherent sum of channel or image signals acquired with at least one different parameter. Partial beamformed data may be used for channel coherence calculation. For image domain coherence, a component image is formed for each different transmit beam or receive aperture function, and a coherence factor image is computed using the set of component images. The coherence factor image is displayed or used to modify or blend other images formed of the same region.
Owner:SIEMENS MEDICAL SOLUTIONS USA INC
Video encoding method
InactiveUS7149250B2Television system detailsPicture reproducers using cathode ray tubesMotion fieldVideo encoding
The present invention relates to an encoding method processing video object planes (VOPs) of I, P or B type and including a dynamic allocation of said VOPs. According to said method, for each input frame a preliminary forward motion estimation is carried out between current and previous frames. Current and previous motion fields are then used to evaluate a coherence factor, expressed as connected to the sums of local differences within current and previous motion field. According to the value of the coherence factor with respect to an empirically determined threshold, a decision is finally taken on the type of the frame to be coded.
Owner:FUNAI ELECTRIC CO LTD
Ultrasonic image processing method, device and equipment
ActiveCN109754407AQuality improvementImage enhancementImage analysisImaging processingImaging quality
The embodiment of the invention provides an ultrasonic image processing method, device and equipment. The method comprises the steps of obtaining a coherence factor of each pixel point of an ultrasonic image; determining a credibility value of each pixel point according to the coherence factor; and processing the ultrasonic image according to the credibility value of each pixel point. According tothe method provided by the embodiment of the invention, the image quality of the ultrasonic image is improved.
Owner:QINGDAO HISENSE MEDICAL EQUIP
Mask correcting method
InactiveUS7438996B2Minimize the differenceImprove calibration accuracyPhotomechanical apparatusSemiconductor/solid-state device manufacturingPresent methodLine width
There is provided a method for correcting a photo mask, which allows the difference between a test mask and a corrected mask with respect to an error of line width depending on coarse / dense pattern to be decreased when the photo masks are corrected by optical proximity effect correction.The present method is consisted of: producing a test mask which acts as a mask for extracting process model for applying an optical proximity effect correction method (s1); transferring and measuring the dimensions of the transferred pattern using the test mask (s2 and s3); obtaining a function model (referred to as process model) of which a simulated result of the transferred pattern of a mask pattern of the photo mask using a function model matches the measured result (s4); obtaining a mask pattern of which a transferred pattern matches a designed pattern using said process model and creating mask data in accordance with the obtained mask pattern (s5); producing a corrected mask in accordance with the created mask data (s5); and setting an exposing condition where an OPE characteristic becomes flat with respect of wide and narrow pitches by adjusting at least one of a numerical aperture (NA) and a coherence factor (σ) of an exposing device when the corrected mask is transferred.
Owner:SONY CORP
Fire detection method and apparatus
ActiveUS7680297B2Character and pattern recognitionColor television detailsPattern recognitionTemporal change
The present invention provides a method and apparatus for detecting fire in a monitored area even if the flames are hidden behind obstructing objects. The steps of this method include: (a) detecting and capturing, at a prescribed frequency, video images of the monitored area, (b) converting the captured images into two-dimensional bitmaps of the temporally varying brightness values observed in the captured images, wherein the spatial resolution of this bitmap is determined by the number of pixels comprising the bitmaps, (c) specifying for any two of the pixels in the bitmaps a temporal coherence factor whose magnitude is a measure over a prescribed time of the similarities observed in the temporal variations of the brightness values being captured at each of the bitmap's pixels, (d) computing this temporal coherence factors for each of the prescribed set of pixels in the captured images, and (e) analyzing the computed temporal coherence factors to identify those sets of pixels that have temporal coherence factors whose values are above a prescribed threshold value, wherein this prescribed threshold value is set so as to identify those pixels that correspond to regions of the monitored area whose temporal variations in brightness indicate that the source of this brightness is a fire in the monitored area.
Owner:AXONX FIKE CORP
Online sidelobe suppression method and system for ultra-wideband step frequency MIMO radar
The invention discloses an online sidelobe suppression method and system for an ultra-wideband step frequency MIMO radar. The method comprises the following steps: S1, sequentially transmitting and receiving ultra-wideband step frequency signals to a target in an imaging area, obtaining partial channel and partial frequency band echo signals through a division operation, and performing direct frequency domain imaging to obtain a plurality of low-resolution radar images with different characteristics of the target; S2, sequentially storing the plurality of low-resolution radar images obtained in S1, and synthesizing the plurality of low-resolution radar images to obtain a high-resolution radar image of the target; S3, calculating coherence factors of the plurality of low-resolution radar images; and S4, weighting a high-resolution radar image by using the coherence factor to obtain a target radar image after sidelobe suppression. According to the online sidelobe suppression method and system for the ultra-wideband step frequency MIMO radar, the target point of the ultra-wideband radar image is enhanced, the sidelobe and the noise point are weakened, the main lobe can be effectivelyreserved and sharpened, the sidelobe is suppressed, the sidelobe suppression is completed while the radar imaging is carried out, and the image quality of the radar images is effectively improved.
Owner:HUNAN TAIKANG ELECTRONICS INFORMATION TECH CO LTD
Multi-beam p-time root compression coherence filtering beam forming method and device
PendingCN112890855AImproved contrast resolutionImprove spatial resolutionInfrasonic diagnosticsSonic diagnosticsBandpass filteringContrast resolution
The embodiment of the invention discloses a multi-beam p-time root compression coherence filtering beam forming method and device. The method comprises the following steps: performing transmission control, namely transmitting ultrasonic waves once in a fixed-point focusing manner; performing delay calculation, namely performing dynamic focusing, multi-beam receiving and delay calculation to obtain data of each channel of multiple beams; performing coherence factor calculation, namely calculating a generalized coherence factor of each wave beam in sequence; performing first-time beam forming, namely performing p-time root signal compression beam forming operation to obtain a first-time beam forming signal; performing band-pass filtering, namely carrying out band-pass filtering; performing quadrature, namely weighting coherence factors; repeating the steps, namely repeating the emission control step to the quadrature step to obtain a multi-beam signal required by a frame of image; and performing second-time beam forming, namely carrying out second-time apodization, and then carrying out coherent superposition on multiple beams to obtain a second-time beam forming signal. According to the method, the beam forming quality is effectively improved, and the contrast resolution, the spatial resolution and the frame rate of the image are further improved.
Owner:深圳蓝影医学科技股份有限公司
Video encoding method
InactiveUS20050259732A1Television system detailsPicture reproducers using cathode ray tubesMotion fieldVideo encoding
The present invention relates to an encoding method processing video object planes (VOPs) of I, P or B type and including a dynamic allocation of said VOPs. According to said method, for each input frame a preliminary forward motion estimation is carried out between current and previous frames. Current and previous motion fields are then used to evaluate a coherence factor, expressed as connected to the sums of local differences within current and previous motion field. According to the value of the coherence factor with respect to an empirically determined threshold, a decision is finally taken on the type of the frame to be coded.
Owner:FUNAI ELECTRIC CO LTD
A device for adjusting coherence factor in lithography illumination system
ActiveCN104965391BImprove transmittanceLarge adjustment rangePhotomechanical exposure apparatusMicrolithography exposure apparatusTransmittanceComputational physics
The invention discloses a coherent factor adjusting device in a photoetching illuminating system. The coherent factor adjusting device comprises a reflecting mirror group, a collimating mirror group and a conical prism group, wherein the reflecting mirror group is positioned on an optical path of the front end of the illuminating system, rotates at high precision under the driving of a motor and can have relatively high rotating precision; the collimating mirror group is positioned on an optimal path of the illuminating system behind the reflecting mirror group; the conical prism group is positioned on an emergent light path of the collimating mirror group; uniform light intensity distribution is obtained on a mask surface through rear uniform illuminating subsystems. According to the coherent factor adjusting device, multi-level change of coherent factors is realized by utilizing a simple method, the transmittance rate of the system is increased, and the purposes of simplifying the structure and reducing the cost are achieved.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
A Multi-baseline Polinsar Vegetation Parameter Inversion Method Considering Temporal Decrelation Factor
ActiveCN110703220BHigh precisionSolve the rank deficit problemRadio wave reradiation/reflectionVegetationAtmospheric sciences
The invention discloses a multi-baseline PolInSAR vegetation parameter inversion method considering the time decoherence factor, comprising the following steps: step 0, introducing the time decoherence factor into the RVoG model, and obtaining the RVoG extended model taking the time decoherence factor into consideration; step 1. Perform preprocessing and polarization interferometry on the multi-baseline polarization interferometric SAR image of the vegetation to obtain multi-baseline multi-polarization complex coherence coefficient observations; step 2. Set and calculate the initial value of the vegetation parameter inversion of the RVoG extended model ; Step 3, select one of the N baselines as a reference baseline, and consider that it does not have the influence of time decoherence factors; Step 4, match the observed values with the RVoG extended model, and construct the observation equation; finally, according to the parameters obtained above value, using a nonlinear iterative algorithm for vegetation parameter inversion. The invention can improve the accuracy of vegetation parameter inversion and is easy to realize.
Owner:CENT SOUTH UNIV
Photo-etching machine coherence factor measuring method based on CCD imaging
InactiveCN108303855AHigh reusabilityHigh detection sensitivityPhotomechanical exposure apparatusMicrolithography exposure apparatusInformation processingLight spot
The invention discloses a CCD image sensor based method for measuring the coherence factor of a photo-etching machine illuminating system online. The main body of a measuring system is mainly composedof three parts: (A) a CCD probe module composed of a pinhole, a lens set, and CCD; (B) a scanning control module composed of XY scanning console and a driver; and (C) a data acquisition and storage processing module composed of a data acquisition card and a computer. The method has the advantages that CCD is used to replace photoresist, through pin-hole imaging, the energy distribution of light spots collected by CCD is analyzed and calculated to obtain part of measurement values of coherence factors, the reutilization rate is high; the measurement precision is high, the responding time is quick, the light sensing time is shortened, the detection efficiency is improved; the CCD is connected to the computer, real-time automatic information processing and data storage are realized, the method is suitable for online detection of a photo-etching system installation and debugging process; the illuminating system coherence factor is measured on the mask surface, problems can be found in time, and the error can be accurately positioned.
Owner:SICHUAN UNIV
A method for calibrating a coherence factor of an excimer lithographic lighting system
InactiveCN108037642AMeet precision requirementsEliminate errorsPhotomechanical exposure apparatusMicrolithography exposure apparatusAngular degreesCoherence factor
The invention relates to a coherence factor measuring device based on CCD imaging for a lithographic system. Calibration of consistency between a CCD light-sensitive surface and a lens focal plane isachieved through a pin hole, a rotating platform, and a manually operated X-Y displacement platform. A proper coordinate system is built on a CCD, a point on the pin hole is selected and is imaged onthe CCD through a lens, and the centroid of the image point is calculated to obtain a first coordinate point A'. The rotating platform is rotated by 90 degrees to obtain a second image, and the centroid of the second image is calculated to obtain a second coordinate point B'. The rotating platform is rotated by the same manner to obtain a third coordinate point A'' and a fourth coordinate point B'' respectively. The four coordinate points are utilized to establish a correlation. When a difference between a distance from the A' to the A'' and a distance from the B' to the B'' is large, it is determined that a certain included angle is between the CCD and the lens focal plane, the included angle is calculated through the correlation established through the four coordinate points, and then the angle of the CCD light-sensitive surface is adjusted until the difference between the distance from the A' to the A'' and the distance from the B' to the B'' is arbitrarily small, thus achieving substantial consistency between the CCD light-sensitive surface and the lens focal plane.
Owner:SICHUAN UNIV
Method for optimizing coherent factor of photoetching machine lighting system
ActiveCN102253607ASmall amount of calculationDepth of focus in lithography meetsPhotomechanical exposure apparatusMicrolithography exposure apparatusCoherence factorLighting system
The invention provides a method for optimizing the coherent factor of a photoetching machine lighting system. The method specifically comprises the following steps of: determining coherent factor values of an end point and a cutting point in a searching range by using a Hopfinger golden section method, calculating the photoetching focal depths corresponding to the coherent factor values, progressively reducing the searching range according to the calculated photoetching focal depths, and calculating the photoetching focal depths corresponding to a new end point and a cutting point again and sequentially repeating the steps until a predetermined condition and position are met. By the method, the calculation amount is small, and the photoetching focal depths meeting the requirements can be acquired.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Coherent factor adjusting system in deep ultraviolet lithography lighting system
ActiveCN102955371BReduce volumeSave spacePhotomechanical exposure apparatusMicrolithography exposure apparatusLithographic artistOptical axis
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
An optimum imaging plane adjusting and calibrating method based on a CCD coherence factor detection apparatus
InactiveCN108037643AHigh reusabilityHigh detection sensitivityPhotomechanical exposure apparatusMicrolithography exposure apparatusCoherence factorLaser
An optimum imaging plane adjusting and calibrating method based on a CCD coherence factor detection apparatus is provided. The apparatus is used for detecting an out-of-focus situation of a CCD in a lens in the axial direction in an optical projection exposure photoetching system, and includes a laser, a planar mirror, the lens, a CCD image sensor and a manually operated X-Y displacement platform.According to the method, firstly, the CCD is utilized to collect a laser spot image, the X-Y displacement platform is moved according to changes of a light spot and barycentric energy to achieve coarse adjustment, then a fine-adjustment evaluation function and a precise adjustment evaluation function are established respectively to move the X-Y displacement platform to achieve fine adjustment andprecise adjustment, and finally, calibration of the optimum imaging plane for the CCD is achieved. The method is simple to operate and high in detection sensitivity and increased in detection efficiency and reliability.
Owner:SICHUAN UNIV
A high-speed super-resolution mimo array imaging method
ActiveCN107390215BCalculation speedGuaranteed real-timeRadio wave reradiation/reflectionMulti inputParallel algorithm
Owner:JILIN UNIV
High-speed super-resolution stationary point scanning imaging method based on wavenumber domain coherence factor
ActiveCN107390216BHigh resolutionLow maximum sidelobeRadio wave reradiation/reflectionStagnation pointReflectance function
Owner:JILIN UNIV
Three dimensional (3D) imaging using optical coherence factor (OCF)
A 3-D imaging system including a computer determining a plurality of coherence factors measuring an intensity contrast between a first intensity of a first region of an interference comprising constructive interference between a sample wavefront and a reference wavefront, and a second intensity of a second region of the interference comprising destructive interference between the sample wavefront and the reference wavefront, wherein the interference between a reference wavefront and a reflection from different locations on a surface of an object. From the coherence factors, the computer determines height data comprising heights of the surface with respect to an x-y plane perpendicular to the heights and as a function of the locations in the x-y plane. The height data is useful for generating a three dimensional topological image of the surface.
Owner:CALIFORNIA INST OF TECH
Method for self-adaptation ultrasonic imaging of spatio-temporally smoothed coherence factor type
ActiveCN103536316BIncrease contrastReduce noiseUltrasonic/sonic/infrasonic diagnosticsInfrasonic diagnosticsComputation complexitySonification
The invention discloses a method for self-adaptation ultrasonic imaging of a spatio-temporally smoothed coherence factor type. The method comprises the following steps that (1) beam forming preprocessing is conducted; (2) beam forming processing is conducted, wherein beam forming processing comprises the steps that delayed focusing is conducted on each channel received signal, a coherence factor value of the spatio-temporally smoothed coherence factor type is calculated according to the channel received signal after delayed processing, and weighted processing is conducted on the coherence sum of the received signals through coherence factors so that beams of each scanning line can be obtained and output; (3) beam forming post-processing is conducted, wherein beam forming post-processing comprises the steps that envelope detection, logarithm compression, scanning conversion and display are conducted on the scanning lines. According to the method for self-adaptation ultrasonic imaging of the spatio-temporally smoothed coherence factor type, side lobe can be restrained, sound disorder is reduced, the contrast ratio of an image is improved, an artifact is remarkably eliminated, the imaging quality is improved, the calculation complexity is low, and the method is easy to achieve in hardware.
Owner:WUHAN WESEE MEDICAL IMAGING CO LTD
Extraction method and device based on high-precision map data recommendation sample
ActiveCN111930871ASave selection timeSolve the tediousness of manual selection of sampling dataGeographical information databasesSpecial data processing applicationsData sourceCoherence factor
The invention relates to an extraction method and device based on a high-precision map data recommendation sample. The method comprises the following steps: obtaining a data source of a high-precisionmap; determining the number of recommended samples, sample data records and the number of elements according to inspection standards; collecting a coherence factor according to the data source; determining recommended samples meeting conditions according to the coherent factors and the elements; and randomly extracting the recommendation samples meeting the conditions. According to the method, the problem that manual selection of sampling data is tedious is solved, the sample selection time is saved, the extraction process of the high-precision map data recommendation samples is more scientific, and the sampling process reflects the overall situation more accurately due to more sample coverage.
Owner:WUHAN ZHONGHAITING DATA TECH CO LTD
A Suppression Method of Azimuth Grating Lobe in UWB Radar Imaging
ActiveCN104808200BAzimuth Grating Lobe SuppressionThe principle is simpleRadio wave reradiation/reflectionUltra wideband radarCoherence factor
The invention discloses a method for restraining ultra-wideband radar imaging azimuth grating lobes, which comprises the steps of (1), carrying out imaging by adopting an ultra-wideband radar imaging method, and calculating an extended coherence factor (ECF) of each imaging point; and (2), weighting an original imaging result by using the ECFs acquired in the step (1) so as to restrain the image azimuth grating lobes. The method disclosed by the invention has the advantages of simple principle, convenient operation, good restraining effect and the like.
Owner:HUNAN NOVASKY ELECTRONICS TECH
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