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37results about How to "Improving the imaging rate" patented technology
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Laser radar imaging device based on compressed sensing and imaging method
ActiveCN105223582ASolve problems in signal processing capabilitiesEffective combinationElectromagnetic wave reradiationImaging qualitySignal on
A laser radar imaging device based on compressed sensing and an imaging method are disclosed. The device comprises an amplitude modulation laser light source, a beam expanding apparatus, two lenses, a DMD digital micro-mirror, an APD photoelectric detector, a high-pass filter, a multiplier, a low pass filter, two AD analog-digital converters, a control system and an image reconstruction system. After being emitted, the laser is scattered by an imaging object and then is projected to a surface of the DMD digital micro-mirror. Reflected light is focused by another lens, then is received by an APD single point detector and then is converted into an amplified voltage signal. High-pass filtering, mixing and low-pass filtering are successively performed on the voltage signal on one parallel branch and the signal penetrates into the reconstruction system after analog-digital conversion. Simultaneously, the voltage signal directly penetrates into the reconstruction system on another parallel branch after the analog-digital conversion. According to input signals of the two branches and a random matrix corresponding to a DMD control device, a certain reconstruction algorithm is combined so that the reconstruction system can complete imaging. By using the device and the method of the invention, an imaging rate and imaging quality are increased to a great extent.
Owner:XI AN JIAOTONG UNIV
High-speed calculation correlated imaging system and method based on preset modulatable light source
ActiveCN105807289AImproving the imaging rateHigh sampling rateElectromagnetic wave reradiationData synchronizationImaging quality
The invention relates to a high-speed calculation correlated imaging system and method based on a preset modulatable light source.The imaging system comprises the light source, an electro-optical modulator array modulating system, a single-point light intensity detector, a data collecting module and a data synchronizing and processing module; the electro-optical modulator array modulating system is used for performing random binary intensity modulation on light emitted by the light source to form a light field with intensity distributed in a random fluctuation mode in free space; the single-point light intensity detector is used for detecting total light intensity obtained after the light field is reflected or transmitted by a target object to be detected and converting the total light intensity into electric signals related to the total light intensity; the data collecting module is used for obtaining the electric signals and obtaining total light intensity fluctuation information, the data synchronizing and processing module is used for controlling data synchronization between the electro-optical modulator array modulating system and the data collecting module and then conducting correlation calculation to obtain an image of the target object to be detected.The electro-optical modulator array modulating system is used for modulating light, the modulation speed is high, the refreshing frequency effect of the preset light source is improved, the refreshing frequency is at least improved to megahertz order, and imaging result and imaging quality are improved.
Owner:XI AN JIAOTONG UNIV
Ghost imaging system and imaging method based on fiber array pseudo-thermal light
InactiveCN105388486AHigh Intensity Fluctuation RateImproving the imaging rateElectromagnetic wave reradiationFiber couplerFiber array
The invention provides a ghost imaging system and imaging method based on fiber array pseudo-thermal light. The ghost imaging system comprises a pulse laser, a fiber coupler, an electro-optic phase modulator, a radio frequency driving power source, a fiber amplifier, a fiber array, a beam expanding collimator, a half-reflecting and half-transparent mirror, a reception telescope, a photoelectric array detector, a signal acquisition module and a signal control and calculation imaging module. Laser light emitted by the pulse laser is divided by the fiber coupler into a plurality of beams of coherent light which are transmitted to the electro-optic phase modulator for random phase modulation, and then, are transmitted to the fiber amplifier for power amplification; after passing through the fiber array, the beam expanding collimator and the half-reflecting and half-transparent mirror, the light is casted to a target; the reception telescope collects scattered light signals and gathers the light signals to the photoelectric detector; electrical signals output by the photoelectric detector are sampled by the signal acquisition module; and the sample data is transmitted to the signal control and calculation imaging module. The ghost imaging system is long in action distance and high in imaging rate, and solves the defects of an existing ghost imaging system.
Owner:XIDIAN UNIV
Laser three-dimensional imaging optical transmit-receive system
ActiveCN104020474AImproving Imaging EfficiencyImproving the imaging rateElectromagnetic wave reradiationCamera lensVisual field loss
The invention discloses a laser three-dimensional imaging optical transmit-receive system. According to the system, a round laser beam is shaped into a narrow strip shape, a coding disc rotating at a high speed is adopted to divide the strip-shaped laser beam into multiple sections of codes, a projection lens transmits the coded laser beam, target reflected light of corresponding image points in the multiple sections is combined by a receiving end by means of a fiber optic image transmission beam and is received by an area array photoelectric sensor, and then altitude data of multiple image points can be measured by each sensor detection unit. According to the system, the method is novel, and high-efficiency and high-seed three-dimensional measurement under the condition of a large visual field can be achieved.
Owner:NANJING UNIV
Super-resolution structure detection array confocal fluorescence imaging device and imaging method thereof
ActiveCN105319195AImproving the imaging rateImprove horizontal resolutionFluorescence/phosphorescenceBeam splitterPrism
The invention provides a super-resolution structure detection array confocal fluorescence imaging device and an imaging method thereof, relating to imaging devices and imaging methods thereof and aiming to solve the problems that the resolution of the existing confocal limiting technology is difficult to increase and confocal images are not clear. The device comprises a laser source, wherein a collimator and beam expander, a beam splitter prism, a 1 / 4 wave plate, a scanning system, an illumination objective, a fluorescent sample, a collecting lens and a CCD (charge coupled device) detector are arranged along the ray propagation direction of the laser source in sequence. The device has the effects that integration is carried out on a detection plane to change the light sensitivity of a corresponding detecting location; the OTF (optical transfer function) bandwidth of a system is expanded; the spatial cut-off frequency of a confocal fluorescence imaging system is improved and the spatial frequency domain bandwidth is expanded, thus obviously improving the lateral resolution of the imaging system; and the device is applicable to the measurement field of industrial topographic imaging.
Owner:HARBIN INST OF TECH
Imaging method of nuclear magnetic resonance T2 image
ActiveCN108872897AReduce scan timeImproving the imaging rateMeasurements using NMRFast spin echoNMR - Nuclear magnetic resonance
The invention discloses an imaging method of a nuclear magnetic resonance T2 image. The imaging method comprises the following steps: step one, pulse sequence setting is performed, wherein the fast spin echo sequence is used as the pulse sequence; step two, the nuclear magnetic resonance test is performed and each echo signal in the echo chain is acquired, wherein the quantity requirement of the echo signals covers the signal intensity of the measured substance at different time points in the lateral relaxation; step three, the corresponding signal intensity of different time points acts as the K space data and image reconstruction is performed; step four, Fourier transform is performed on the image data of the K space so as to obtain the MR signal intensity of each stimulated voxel in theposition space; and step five, the T2 value of each stimulated voxel is calculated. The scanning time can be reduced and the scanning speed can be improved and the method is suitable for examinationof autonomic motor organs.
Owner:SHANGHAI EAST HOSPITAL
Super-resolution structure detection array confocal coherent imaging device and imaging method thereof
ActiveCN105547144AImproving the imaging rateImprove horizontal resolutionUsing optical meansBeam splitterPrism
A super-resolution structure detection array confocal coherent imaging device and the imaging method thereof provided by the invention relate to an imaging device and an imaging method thereof. The objective of the invention is to solve the problems that the resolution of the confocal spacing technology is difficult to improve and the confocal imaging is not clear. The device provided by the invention comprises a laser source; a collimation device, a microlens array, a collimating lens, a beam splitter prism, a 1 / 4 wave plate, a scanning system, an illumination object lens, an industrial sample, a collection lens and a CCD detector are arranged in order in the ray propagation direction of the laser source; and integration is performed on the detection surface to change the luminous sensitivity corresponding to the detection position so as to allow the system CTF bandwidth to be enlarged. The transverse resolution of the confocal system is improved while the imaging rate of the structure detection confocal coherent imaging system is enhanced; and moreover, the super-resolution structure detection array confocal coherent imaging device and the imaging method thereof are suitable for the measurement field of the industry morphology imaging.
Owner:HARBIN INST OF TECH
Self-adaptive compressed sampling imaging method based on Haar wavelet brother coefficient
InactiveCN104656099AAddressing Shortfalls in High-Resolution ImagingAvoid storage capacityElectromagnetic wave reradiationAdaptive compressionRelationship - Father
The invention relates to a self-adaptive compressed sampling imaging method based on a Haar wavelet brother coefficient. The method comprises the following steps: firstly acquiring all wavelet coefficients under a target standard resolution by using a digital micromirror device (DMD); then from the standard resolution, predicting the next layer non-sampled important wavelet coefficient position from the layer sampled coefficient by combining a predetermined wavelet important threshold value according to the relationship between a Haar wavelet father and son coefficient and a brother coefficient, and configuring a wavelet base by using the DMD, and sampling the important wavelet coefficients to obtain a wavelet coefficient matrix with relatively high resolution; repeating predicting and sampling processes till the predetermined imaging resolution is reached to stop sampling, and carrying out wavelet inverse transform to obtain a target scene image. By combining the Haar wavelet brother coefficient information, the predicting precision of the important wavelet coefficient position is improved, the number of times of measurement required by DMD sampling is reduced, and the imaging quality and the imaging speed are improved.
Owner:西安西光创威光电有限公司
Quick imaging model training method and device and server
ActiveCN111091604AImproving the imaging rateImprove imaging effectReconstruction from projectionCharacter and pattern recognitionRapid imagingFeature extraction
The invention belongs to the technical field of magnetic resonance scanning imaging, and provides a quick imaging model training method and device, and a server. The method comprises the steps: carrying out the undersampling of an image obtained through magnetic resonance scanning according to an undersampling mask during each model iterative training, and obtaining training data; inputting the training data into a quick imaging model, performing feature extraction on the training data through N multi-granularity attention modules according to multi-scale information and an attention mechanismof an image, and fusing feature maps extracted by each multi-granularity attention module; carrying out image reconstruction on the fused feature map, and outputting imaging data; reversely calculating a gradient according to the imaging data and a target label so as to update parameters of the quick imaging model and the under-sampling mask through the gradient; and carrying out forward calculation by adopting the updated parameters and the under-sampling mask. According to the embodiment of the invention, the problems that the under-sampling mask cannot be optimized and the imaging effect is poor are solved.
Owner:SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
Interference type microwave radiometer circular ring antenna array based on cyclic subarrays
InactiveCN106450703ADifficulty of SimplificationAchieve modularityAntenna arraysRadiating elements structural formsAngular distanceModularity
The invention provides an interference type microwave radiometer circular ring antenna array based on cyclic subarrays. The circular ring antenna array adopts a circular ring array (3); the circular ring array (3) comprises a plurality of circular ring-shaped subarrays (1) arranged in an equal angular distance on the same circular ring; the angular distance is an included angle between every two adjacent circular arc-shaped subarrays; at least two antenna units (2) are distributed on each circular arc-shaped subarray (1); and each circular arc-shaped subarray (1) is arranged by adopting the antenna units (2) of the same structure respectively. The circular ring antenna array provided by the invention uses a plurality of same circular arc-shaped subarrays which are spliced into an integral circular ring array in an equal angular distance arrangement manner, so that the reliability and modularity of the system are improved, meanwhile the imaging cycle of the system is reduced, and then the work efficiency is improved.
Owner:NAT SPACE SCI CENT CAS
Image scanning microscopic imaging method and device based on double-microlens array
InactiveCN110967817AFast scanningReduce rebuild timeMicroscopesFluorescence/phosphorescenceOphthalmologyImage resolution
The invention relates to an image scanning microscopic imaging method and device based on a double-microlens array, and belongs to the technical field of optical microscopic measurement. According tothe invention, an array type multi-focus generated by the micro-lens array is used for illuminating a sample; the imaging speed is improved, the influence of out-of-focus fluorescence is eliminated through the pinhole array, each focusing light beam is scaled by 1 / 2 through the second micro lens array, all-optical implementation of subsequent digital information processing of traditional image scanning microscopy is achieved, it is guaranteed that the resolution ratio is improved by two times, and meanwhile the problem that a traditional image scanning microscopy system is low in imaging speedis solved. The laser beam reaches the first micro-lens array after being expanded to generate an array type illumination beam, and after the array type illumination beam is emitted to the surface ofa sample, the objective lens collects multi-focus fluorescence from the sample and emits the multi-focus fluorescence to the pinhole array to eliminate the influence of out-of-focus fluorescence. Thesecond micro-lens array locally shrinks each focus point, meanwhile, the original focusing direction of the light beam is kept, and the zoomed fluorescence focus is imaged to the sCMOS camera under the deflection effect of the scanning galvanometer.
Owner:HARBIN INST OF TECH
Single-pixel terahertz detection system and image acquisition method
PendingCN111736171AImprove collection efficiencyImprove imaging resolutionElectromagnetic wave reradiationImage resolutionSpeckle pattern
The invention discloses a single-pixel terahertz detection system and an image acquisition method. According to the system, a single-pixel speckle pattern is adopted to modulate a terahertz wave beamreflected by a to-be-measured target object to obtain the light field intensity value of the terahertz wave beam corresponding to each single-pixel speckle pattern, so that imaging data can be quicklyobtained, the data acquisition efficiency is greatly improved, the imaging time is shortened, and the requirements on environment and hardware by adopting single-pixel imaging are low. And meanwhile,the strong penetrating power and detection capability of terahertz waves are combined, so that the imaging resolution and detection efficiency of the system are greatly improved, high-quality imagingand detection can be carried out on the surfaces or the interiors of various objects, and the practicability is wide.
Owner:GUANGDONG UNIV OF TECH
Terahertz photoacoustic single-pixel imaging device and imaging method
PendingCN112611719ALow costImproving the imaging rateMaterial analysis by optical meansLaser beamsLight modulation
The invention discloses a terahertz photoacoustic single-pixel imaging device and an imaging method. The imaging device comprises a light source module, a spatial light modulation module, a terahertz light modulation module, a terahertz photoacoustic detection module and a processing module, wherein the light source module is used for outputting a pump laser beam and a terahertz beam; the spatial light modulation module is used for modulating the pumping laser beam and then transmitting the modulated pumping laser beam to the terahertz light modulation module; the terahertz light modulation module is used for modulating the terahertz light beam and then transmitting the modulated terahertz light beam to a to-be-imaged object; the terahertz photoacoustic detection module comprises a terahertz photoacoustic material and an ultrasonic detector, the terahertz photoacoustic material is used for generating a photoacoustic signal under the excitation of terahertz light, and the ultrasonic detector is used for converting the photoacoustic signal into an electric signal; and the processing module is used for realizing single-pixel imaging of the to-be-imaged object according to the electric signal. The device has advantages of low cost, convenience in use, high time resolution and spatial resolution and the like, and can be used for near-field terahertz imaging of an object to be imaged.
Owner:TIANJIN UNIV
Array scanning super-resolution microscopic imaging device, method and equipment based on multiple signal classification algorithm and storage medium
ActiveCN114113019AImprove lateral imaging resolutionImproving the imaging rateFluorescence/phosphorescenceMicro imagingLaser scanning
The invention discloses an array scanning super-resolution microscopic imaging device, method and equipment based on a multiple signal classification algorithm and a storage medium, belongs to the field of laser scanning microscopic imaging, and aims to solve the problems that the transverse resolution of the laser scanning microscopic imaging technology is difficult to improve and the image acquisition rate is low. The system comprises a beam expanding system, a micro lens array, a collimating lens, a scanning galvanometer, a scanning lens, a tube lens, a dichroscope, an objective lens, a sample, an objective table, a collecting lens and a CCD camera. The array scanning super-resolution microscopic imaging device is used for obtaining a low-resolution image sequence of a fluorescent sample, and the low-resolution image sequence is reconstructed based on a multiple signal classification algorithm to obtain a super-resolution image. An array point illumination mode and a multiple signal classification algorithm are combined, the axial chromatography capacity is achieved while the transverse imaging resolution is improved, the imaging rate is improved through an array scanning method, and biological fluorescence samples can be imaged in a random flickering mode.
Owner:HARBIN INST OF TECH
Rapid imaging method of atomic force microscope
InactiveCN109765405AImprove efficiencyGood precisionScanning probe microscopyAtomic force microscopyMicro nano
The invention relates to the field of precision instruments in micro-nano science and technology studies, in particular to a rapid imaging method of an atomic force microscope. The invention proposesand realizes a rapid imaging method of an atomic force microscope based on a two-dimensional regularization iterative hard threshold algorithm to improve the efficiency and accuracy of the atomic force microscope during imaging. Compared with a conventional imaging method of the atomic force microscope, by adopting the imaging method provided by the invention, the imaging sampling time of the atomic force microscope is reduced through compression sampling, the damages of a probe to a sample are reduced, and the damages to the sample surface caused by excessive contact between the probe tip andthe sample surface are reduced; and meanwhile, the calculation complexity of two-dimensional sparse signals is greatly reduced based on the two-dimensional regularization iterative hard threshold algorithm, the signal reconstruction efficiency is improved, the imaging rate of the atomic force microscope is greatly improved, and the sample damages caused by the contact between the probe tip and the sample are obviously reduced.
Owner:JIANGNAN UNIV
Multicolor fluorescence imaging method and system under single exposure
ActiveCN106841137AImproving the imaging rateRealize splittingFluorescence/phosphorescencePhysicsFluorescent imaging
The invention discloses a multicolor fluorescence imaging method and system under single exposure. The method comprises the steps of amplifying a fluorescence sample on an image plane through an object lens to obtain a first real image on a focal plane of the object lens; arranging a reflector on the focal plane of the object lens and carrying out spectrum separation on the first real image through a 4f system and a grating arranged in the 4f system; obtaining an image after spectrum separation through a collection device, wherein the reflector is arranged on the front focal plane of the 4f system and the grafting is arranged on the focal plane in the middle of the 4f system. The multicolor fluorescence imaging method and system have the advantage that the imaging rate of a multispectral fluorescence microscopy is improved.
Owner:TSINGHUA UNIV
Synthetic aperture radar rapid imaging method and device based on neural network
InactiveCN111239731AReduce computational costImproving the imaging rateNeural architecturesNeural learning methodsPattern recognitionRapid imaging
The invention discloses a synthetic aperture radar rapid imaging method based on a neural network, and the method comprises the steps: carrying out the low-resolution synthetic aperture radar imagingthrough employing a backward projection algorithm, carrying out the high-resolution reconstruction of an obtained low-resolution image through employing an image reconstruction model, and obtaining acorresponding high-resolution image, wherein the image reconstruction model is obtained through the following method by pre-training: performing low-resolution and high-resolution synthetic aperture radar imaging on a target by using the backward projection algorithm to obtain a training sample; and then training the neural network by taking low-resolution and high-resolution images in a series ofdifferent training samples as an input value and a true value respectively. The invention further discloses a synthetic aperture radar rapid imaging device based on the neural network. Compared witha traditional BP imaging algorithm, the method is small in calculation amount, high in operation rate, good in robustness and high in adaptive capacity.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Vibration element array determining method, puncture needle imaging method and ultrasonic equipment
PendingCN112244889AResolve integrityUnclear solutionUltrasonic/sonic/infrasonic diagnosticsSurgical needlesRadiologyAcoustics
The invention relates to the technical field of ultrasonic puncture, in particular to a vibration element array determining method, a puncture needle imaging method and ultrasonic equipment. The vibration element array determining method comprises the following steps of: stimulating a preset vibration element array to emit an ultrasonic wave to a target tissue; judging whether a global shear waveis detected or not; and when the global shear wave can not be detected, regulating the vibration element array used for emitting the ultrasonic wave in an ultrasonic probe so as to determine the distribution of a target vibration element array corresponding to the target tissue. By use of the vibration element array determining method disclosed by the invention, the distribution of the target vibration element array required by the target tissue is confirmed in advance to guarantee that the vibration element array can emit multi-angle ultrasonic wave beams during puncture, the target tissue isstimulated to generate the shear wave which is globally spread, and the problem that due to tissue attenuation, the shear wave can not be effectively spread to the position of the puncture needle, and the image of the puncture needle is not complete and is not clear can be solved. Meanwhile, according to a vibration element array distribution situation, the spreading direction of each shear waveis determined to carry out directional filtering, and imaging accuracy is guaranteed.
Owner:SUZHOU INST OF BIOMEDICAL ENG & TECH CHINESE ACADEMY OF SCI
Method and system for multicolor fluorescence imaging under single exposure
ActiveCN106841137BRealize splittingAchieve separationFluorescence/phosphorescenceGratingSingle exposure
The invention discloses a multicolor fluorescence imaging method and system under single exposure. The method comprises the steps of amplifying a fluorescence sample on an image plane through an object lens to obtain a first real image on a focal plane of the object lens; arranging a reflector on the focal plane of the object lens and carrying out spectrum separation on the first real image through a 4f system and a grating arranged in the 4f system; obtaining an image after spectrum separation through a collection device, wherein the reflector is arranged on the front focal plane of the 4f system and the grafting is arranged on the focal plane in the middle of the 4f system. The multicolor fluorescence imaging method and system have the advantage that the imaging rate of a multispectral fluorescence microscopy is improved.
Owner:TSINGHUA UNIV
A fully electronically controlled dual-Stokes optical wavelength tuning device and method
ActiveCN110186896BEnhanced tuning stabilityImproving the imaging rateRaman scatteringMicro imagingFemto second laser
The invention discloses an all-electrically controlled dual-Stokes optical wavelength tuning device, comprising a femtosecond laser (1), an ultrashort pulse power and polarization state adjustment part, a highly nonlinear polarization-maintaining photonic crystal fiber (7), an optical fiber Collimating beam expander (8), optical filter (9), dual Stokes optical pulse delay adjustment part and CARS microscopic imaging system (18), using the soliton self-silicon in highly nonlinear polarization-maintaining photonic crystal fiber The frequency shift effect produces optical solitons whose wavelength can be continuously adjusted in a large range and uses them as Stokes optical pulses. The short-pulse optical power and linear polarization direction can realize the independent and flexible adjustment of the fast axis and slow axis optical soliton wavelengths. The invention enhances the tuning stability of the excitation source of the CARS microscopic imaging system, realizes independent and flexible adjustment of double Stokes wavelengths, and improves the imaging rate of the CARS microscopic imaging system.
Owner:TIANJIN UNIV
A rifled barrel scanning device
ActiveCN109521497BReduce design difficultyReduce manufacturing costOptical detectionEngineeringRadome
Owner:四川省华盾防务科技股份有限公司
A super-resolution structure detection array confocal coherent imaging device and imaging method thereof
ActiveCN105547144BImproving the imaging rateImprove horizontal resolutionUsing optical meansBeam splitterPrism
A super-resolution structure detection array confocal coherent imaging device and the imaging method thereof provided by the invention relate to an imaging device and an imaging method thereof. The objective of the invention is to solve the problems that the resolution of the confocal spacing technology is difficult to improve and the confocal imaging is not clear. The device provided by the invention comprises a laser source; a collimation device, a microlens array, a collimating lens, a beam splitter prism, a 1 / 4 wave plate, a scanning system, an illumination object lens, an industrial sample, a collection lens and a CCD detector are arranged in order in the ray propagation direction of the laser source; and integration is performed on the detection surface to change the luminous sensitivity corresponding to the detection position so as to allow the system CTF bandwidth to be enlarged. The transverse resolution of the confocal system is improved while the imaging rate of the structure detection confocal coherent imaging system is enhanced; and moreover, the super-resolution structure detection array confocal coherent imaging device and the imaging method thereof are suitable for the measurement field of the industry morphology imaging.
Owner:HARBIN INST OF TECH
High-speed computing correlation imaging system and imaging method based on preset adjustable light source
ActiveCN105807289BImproving the imaging rateHigh sampling rateElectromagnetic wave reradiationData synchronizationPoint light
The invention relates to a high-speed calculation correlated imaging system and method based on a preset modulatable light source.The imaging system comprises the light source, an electro-optical modulator array modulating system, a single-point light intensity detector, a data collecting module and a data synchronizing and processing module; the electro-optical modulator array modulating system is used for performing random binary intensity modulation on light emitted by the light source to form a light field with intensity distributed in a random fluctuation mode in free space; the single-point light intensity detector is used for detecting total light intensity obtained after the light field is reflected or transmitted by a target object to be detected and converting the total light intensity into electric signals related to the total light intensity; the data collecting module is used for obtaining the electric signals and obtaining total light intensity fluctuation information, the data synchronizing and processing module is used for controlling data synchronization between the electro-optical modulator array modulating system and the data collecting module and then conducting correlation calculation to obtain an image of the target object to be detected.The electro-optical modulator array modulating system is used for modulating light, the modulation speed is high, the refreshing frequency effect of the preset light source is improved, the refreshing frequency is at least improved to megahertz order, and imaging result and imaging quality are improved.
Owner:XI AN JIAOTONG UNIV
MRI t2 image imaging method
ActiveCN108872897BReduce scan timeImproving the imaging rateMeasurements using NMRFast spin echoVoxel
The invention discloses a nuclear magnetic resonance T2 image imaging method provided by the invention, which includes the following steps: Step 1, setting a pulse sequence, and the pulse sequence adopts a fast spin echo sequence. Step 2: Carry out nuclear magnetic resonance test and collect echo signals in the echo chain; the number of echo signals is required to cover the signal intensities at different time points in the transverse relaxation of the measured substance. Step 3, taking the corresponding signal strengths at different time points as K-space data and performing image reconstruction. Step 4: Obtain the MR signal intensity of each excited voxel in the position space by Fourier transforming the image data in the K space. Step five, calculating the T2 value of each excited voxel. The invention can reduce the scanning time and increase the scanning speed, and is suitable for the inspection of autonomous moving organs.
Owner:SHANGHAI EAST HOSPITAL
Interventional Magnetic Resonance Imaging Method, System and Medium Based on Low Rank and Sparse Decomposition
ActiveCN112881958BAvoid Motion ArtifactsHigh downsampling rateMeasurements using NMR imaging systemsInterventional imagingImage resolution
Owner:SHANGHAI JIAOTONG UNIV
A super-resolution structure detection array confocal fluorescence imaging device and its imaging method
ActiveCN105319195BImproving the imaging rateImprove horizontal resolutionFluorescence/phosphorescenceBeam splitterPrism
The invention provides a super-resolution structure detection array confocal fluorescence imaging device and an imaging method thereof, relating to imaging devices and imaging methods thereof and aiming to solve the problems that the resolution of the existing confocal limiting technology is difficult to increase and confocal images are not clear. The device comprises a laser source, wherein a collimator and beam expander, a beam splitter prism, a 1 / 4 wave plate, a scanning system, an illumination objective, a fluorescent sample, a collecting lens and a CCD (charge coupled device) detector are arranged along the ray propagation direction of the laser source in sequence. The device has the effects that integration is carried out on a detection plane to change the light sensitivity of a corresponding detecting location; the OTF (optical transfer function) bandwidth of a system is expanded; the spatial cut-off frequency of a confocal fluorescence imaging system is improved and the spatial frequency domain bandwidth is expanded, thus obviously improving the lateral resolution of the imaging system; and the device is applicable to the measurement field of industrial topographic imaging.
Owner:HARBIN INST OF TECH
A high-speed image sensor with frame rate up to bandwidth limit rate
ActiveCN110290335BImproving the imaging rateSimple solutionTelevision system detailsColor television detailsDigital dataExposure
A high-speed image sensor whose frame rate can reach the bandwidth limit rate belongs to the technical field of VLSI electrical components. It can complete the analog-to-digital conversion process in parallel at the pixel level, and is equivalent to a binary digital data after the analog-to-digital conversion is completed. The storage array can be directly and seamlessly grafted on the high-speed data reading and transmission technology used in the existing memory system. Since the image exposure process and the image data reading and transmission process are independent of each other, they can be overlapped in time. Therefore, its imaging rate and frame rate can reach the limit rate allowed by the digital data transmission bandwidth. The present invention also provides an improved solution to separate the exposure process and the analog-to-digital conversion process independently, so that the exposure process and the analog-to-digital conversion process can be overlapped in time sequence, and the exposure time can be maximized. The invention can output image data with arbitrary precision, and can be directly combined with a processor to form high-speed image shooting.
Owner:王勇
An On-Chip Coherent Detection Scanning Coaxial Area Array Transceiver
ActiveCN113671464BImproving the imaging rateSolution to short lifeWave based measurement systemsConvertersSilicon interposer
The invention discloses a scanning coaxial area array transceiver for on-chip coherent detection, comprising an optical switch array, a transceiver detection matrix and an electrical switch array; the optical switch array is composed of a 1xN optical switch and N 1xM beam splitters; The electric switch array is composed of M Nx1 electric switches and M analog-to-digital converters; the sending and receiving detection matrix is composed of MxN pixel units, each pixel unit includes two-stage 2x2 beam splitters, and each pixel unit has both transmitting and receiving functions. , On-chip detection function. The present invention realizes direct detection at the pixel level on the chip by designing a two-stage 2x2 beam splitter structure of the pixel unit, thereby increasing the imaging rate; the present invention designs the optical switch array, the transceiver detection matrix and the electrical switch array to be implemented on different chips respectively, It is connected through a silicon interposer to achieve pure solid state, long life, more stable performance, small size, easy installation, and convenient mass production at reduced cost.
Owner:HANGZHOU XIGHT SEMICON CO LTD
An Adaptive Compression Sampling Imaging Method Based on Haar Wavelet Sibling Coefficients
InactiveCN104656099BAddressing Shortfalls in High-Resolution ImagingAvoid reconstruction computationally complex constraintsElectromagnetic wave reradiationAdaptive compressionAlgorithm
The invention relates to a self-adaptive compressed sampling imaging method based on a Haar wavelet brother coefficient. The method comprises the following steps: firstly acquiring all wavelet coefficients under a target standard resolution by using a digital micromirror device (DMD); then from the standard resolution, predicting the next layer non-sampled important wavelet coefficient position from the layer sampled coefficient by combining a predetermined wavelet important threshold value according to the relationship between a Haar wavelet father and son coefficient and a brother coefficient, and configuring a wavelet base by using the DMD, and sampling the important wavelet coefficients to obtain a wavelet coefficient matrix with relatively high resolution; repeating predicting and sampling processes till the predetermined imaging resolution is reached to stop sampling, and carrying out wavelet inverse transform to obtain a target scene image. By combining the Haar wavelet brother coefficient information, the predicting precision of the important wavelet coefficient position is improved, the number of times of measurement required by DMD sampling is reduced, and the imaging quality and the imaging speed are improved.
Owner:西安西光创威光电有限公司
A method for blur-free imaging of geo-satellite bistatic SAR
ActiveCN113238229BAvoid calculationAvoid storageDesign optimisation/simulationSpecial data processing applicationsImaging processingRadar
The invention discloses a GEO star-machine dual-base SAR non-fuzzy imaging processing method, which is applied in the field of radar technology, and aims at the problem that the existing technology cannot perform efficient and accurate imaging of the SAR echo signal under the GEO star-machine double-base SAR working mode , the present invention first completes the construction of the echo signal model according to the geometric relationship of the GEO satellite-machine bistatic SAR; then, establishes the echo decoupling observation model under-sampled in the azimuth; then, converts the decoupling observation model into a sparse and low-rank joint Solve the problem; finally, use the improved alternating direction multiplier method to restore the scene and obtain the imaging result; it can effectively solve the problem of low computational efficiency in the unambiguous imaging of the GEO satellite bistatic SAR, and can realize the high efficiency of the GEO satellite bistatic SAR. High-precision imaging.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
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