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51results about How to "Meet resolution requirements" patented technology
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Terahertz spectroscopy feature extraction method based on convex combination kernel function principal component analysis
ActiveCN105279379AHigh feature discriminationHigh feature validitySpecial data processing applicationsFrequency spectrumSignal on
The present invention discloses a terahertz spectroscopy feature extraction method based on convex combination kernel function principal component analysis, and relates to the field of spectrum analysis and substance type detection technologies. The method comprises: acquiring a time domain observed signal, filtering noise information by a frequency terahertz spectrum curve obtained from a discrete fourier transformation, performing cubic spline interpolation on the spectrum curve, performing resampling by intercepting comparable data in a same frequency range and completing data normalization; and performing a convex combination kernel function mapping on a sample after completing preprocessing, performing dimension reduction on a mapped basis function matrix to finally realize terahertz spectroscopy feature extraction, and analyzing intra-cluster, inter-cluster relationships of dimension reduced data. According to the terahertz spectroscopy feature extraction method based on convex combination kernel function principal component analysis, the number and high resolution of a spectrum sample are not required, and the effect of a interference signal on the feature extraction can be fully reduced, so that the feature extraction and a low dimension representation of the terahertz frequency domain spectroscopy are realized in the case of unknown substance types and numbers, and the method has a distinct cluster effect.
Owner:KUNMING UNIV OF SCI & TECH
Rear projection screen
InactiveCN1305607AImprove performanceMeet resolution requirementsProjectorsColor television detailsProjection screenImage resolution
A rear projection screen assembly is described that includes a diffuser and a polarizer. The diffuser has particles dispersed within a binder. The particles and the binder have different refractive indices and are chosen such that the diffuser spreads light of an initial polarization state a cone of angles while substantially preserving the initial polarization state of the light. The diffuser also substantially depolarizing a portion of the light that is laterally scattered in the diffuser. The polarizer is disposed to receive light transmitted through the diffuser. The polarizer transmits light of the initial polarization state while absorbing a portion of the laterally scattered light that has a different polarization state. The resolution of the overall screen assembly may be made higher while also improving other characteristics of the screen assembly.
Owner:3M INNOVATIVE PROPERTIES CO
Method and device for detecting video image
InactiveCN104834886ALow costMeet resolution requirementsCharacter and pattern recognitionImage resolutionImage detection
The invention discloses a method and device for detecting a video image to solve problems that the time of detecting a target image is relatively long, the cost is relatively large, and the obtained target image resolution cannot satisfy a following processing requirement in the prior art. The method comprises: obtaining a video image from a video acquisition device working at an initial operating angle and a first focal length; performing target image detection of each frame of the video image by utilizing a target image model; tracking the detected target image; when that the immobile time of the target image reaches preset time is determined via tracking, storing the current video image; adjusting the operating angle of the video acquisition device according to the position of the target image in the video image; controlling the video acquisition device to work in a second focal length according to the preset resolution of the target image, wherein the second focal length is larger than the first focal length; and controlling the video acquisition device to be switched back to the first focal length and the initial operating angel, after the obtained video image is stored.
Owner:ZHEJIANG DAHUA TECH CO LTD
A method for extracting road network topology points in a picture
ActiveCN109948477AStrong applicabilityThe algorithm is simple and easy to useCharacter and pattern recognitionStill image data indexingPicture recognitionPoint data
The invention provides a method for extracting road network topology points in a picture, which can quickly and accurately identify nodes, inflection points and intermediate nodes of a road network. The method comprises four steps of reading picture information, preprocessing pictures, scanning a skeleton picture to obtain topological points and road nodes, and deleting redundant nodes. Accordingto the method, road network topological points are extracted based on picture recognition, and a basis is provided for obtaining road network data and topological relations. According to the method, avirtual road traffic system basic database construction method is expanded, road network topology point data can be rapidly obtained in batches, and the method can be applied to regional road planning. Meanwhile, according to the method, the road network pictures presented by map software are fully utilized, and the road network data source is expanded.
Owner:SOUTHEAST UNIV
Imaging method and device of synthetic aperture radar (SAR)
ActiveCN106908792AMeet resolution requirementsAchieve repeated observationsRadio wave reradiation/reflectionSynthetic aperture sonarRadar
The invention discloses an imaging method and device of an SAR. The method comprises that scanning parameters, including the maximal scanning angle and a scanning period at least, of azimuth wave beam scanning of the SAR is determined; the SAR is controlled to carry out present azimuth wave beam scanning from a preset start moment by taking the maximal scanning angle as an initial scanning angle and the scanning period as a time length; after the present azimuth wave beam scanning, the SAR is controlled to carry out next azimuth wave beam scanning till a preset end moment by taking the maximal scanning angle as an initial scanning angle and the scanning period as a time length; and echo data obtained by as azimuth wave beam scanning between the start moment and the end moment is used to carry out SAR imaging.
Owner:INST OF ELECTRONICS CHINESE ACAD OF SCI
Pixel array and manufacturing method of display device comprising the pixel array
ActiveCN106033767AReduce difficultyImprove yieldSolid-state devicesSemiconductor/solid-state device manufacturingManufacturing technologyImage resolution
The invention provides a pixel array and a manufacturing method of a display device comprising the pixel array. Based on a traditional pixel array arrangement mode, sub-pixels with the same luminescence color are integrated into one sub-pixel unit. Based on the condition that pixel array luminescence is not influenced, a mask layer plate opening is used to form one sub-pixel unit in a manufacturing technology. Mask layer plate manufacturing difficulty is effectively reduced and simultaneously a precision requirement in a pixel array manufacturing technology can be greatly decreased. And the formed display device can satisfy a resolution requirement. Through one mask layer plate opening, a plurality of adjacent sub-pixels are formed. Technology difficulty can be effectively reduced, a yield rate of the device is increased and technology cost is reduced.
Owner:EVERDISPLAY OPTRONICS (SHANGHAI) CO LTD
Interference distributed optical fiber acoustic sensing device and sensing method
ActiveCN110470376AHigh strengthImprove signal-to-noise ratioSubsonic/sonic/ultrasonic wave measurementUsing wave/particle radiation meansFiber couplerGrating
The invention discloses an interference distributed optical fiber acoustic sensing device. The device includes a light source (1), a polarization controller (2), a polarization beam splitter (3), a modulation signal generating device (5), a first light amplifier (7), a first 1*2 fiber coupler (8), a time-delay fiber (9), a second 1*2 fiber coupler (10), a fiber circulator (11), a sensing fiber (12), a second light amplifier (13), a micro-reflective grating array (14), a second photodetector (15), an acquisition card (16), and a signal processing device (17) which are connected in sequence. Compared with the prior art, the device and the method can increase rapidity and simplicity of sound sensing demodulation, and different sensing spatial resolution requirements can be satisfied through flexible arrangement of spacing of a micro-reflective grating.
Owner:TIANJIN UNIV
Shooting control method and mobile terminal
ActiveCN108513067AMeet resolution requirementsSatisfy image quality requirementsTelevision system detailsColor television detailsImage resolutionImage quality
Owner:VIVO MOBILE COMM CO LTD
Imaging corneal curvimeter optical system
InactiveCN103767675AAvoid subjective errorImprove image qualityEye diagnosticsEye corneasCorneal curvature radius
The invention discloses an imaging corneal curvimeter optical system, and aims to accurately measure the curvature radius and the astigmatism of the front surface of a human cornea. The optical system comprises an annular cursor, a primary imaging system, a semi-transparent semi-reflective mirror, a secondary imaging system and a CCD (charge coupled device) receiver. The optical system is characterized in that the annular cursor is imaged by the primary imaging system, reflected by the front surface of the cornea and imaged by the secondary imaging system, and an annular image is finally formed on the CCD receiver. The formed annular image is analyzed by the aid of modern image processing technology, and the curvature radius and the astigmatism of the measured cornea are calculated. The measuring range is 5.5mm-11mm, and measuring precision reaches 0.072D when the curvature radius of the cornea is 7.8mm. Measured corneas with different curvature radiuses are measured in an external focusing measuring mode by a novel imaging corneal curvimeter. In addition, the corneal curvimeter comprises a calibration system to improve precision. The optical system has the advantages of wide measuring range and high measuring precision.
Owner:NANKAI UNIV
Anti-saturation high-gain self-adaptive offset type ground nuclear magnetic resonance signal amplification apparatus
ActiveCN105223622AEasy to saturateAvoid saturationDetection using electron/nuclear magnetic resonanceBand-pass filterMain channel
The invention relates to an anti-saturation high-gain self-adaptive offset type ground nuclear magnetic resonance signal amplification apparatus. In a high-noise environment, in case of too high gains, output of an amplifier is satirized, and in case of too low gains, nuclear magnetic resonance signals cannot be effectively amplified. According to the invention, the ground nuclear magnetic resonance signals are received by use of one or more main channels, and ambient noise is received through one or more reference channels. After passing through a front amplifier and a band pass filter, receiving data passes through an analog-to-digital converter and then enters a self-adaptive noise canceller. By use of a variable step self-adaptive algorithm, the ambient noise in a learning main channel is adaptively tracked, the noise is subjected to analog quantity subtraction in the main channel after passing through a digital-to-analog converter, and high-gain amplification is then carried out after the correlation ambient noise can be effectively filtered, such that saturation of a final amplifier can be prevented, and at the same time, the requirement for resolution of a data acquisition system is met.
Owner:JILIN UNIV
TV camera device with four spliced double-light-path CCDs (Charge Coupled Devices)
ActiveCN102752503AAchieve separationSolve the seamless docking of imagesTelevision system detailsColor television detailsTarget surfaceCompound prism
The invention discloses a TV camera device with four spliced double-light-path CCDs (Charge Coupled Devices) and belongs to the technical field of photoelectrical imaging. Two same imaging lens sets are adopted by the TV camera device; a turning reflector and an image synthesized compound prism are used for superposing two paths of light energies, so that the light energy on each CCD target surface is doubled; the problem of insufficient light energy on the CCD target surface during the process of splicing four single-light-path CCDs is solved; besides, the image synthesized compound prism, two light-splitting compound prisms and two reflectors are utilized to realize the separation of four CCD mounting surfaces; and a tuning mechanism containing two pairs of double optical wedges is used for eliminating the image position deviation of a two-path optical system, so that the problem of image seamless butt-joint during the process of splicing the four CCDs is effectively solved. The TV camera device provided by the invention has the advantages of simple structure, light weight, low cost, convenience in debugging, high reliability, and the like.
Owner:中国兵器工业第二0五研究所
Machine vision detection device and method based on line scanning camera
ActiveCN102636436AMeet resolution requirementsFix resolution requirement mismatchMaterial analysis by optical meansMachine visionImage resolution
The invention provides a machine vision detection device and method based on a line scanning camera. The machine vision detection device comprises a driving roller, a first encoder and the line scanning camera, wherein the first encoder is mounted on the driving roller which rotates to drive the first encoder to generate a first encoder pulse signal; the resolution of the first encoder is K1; the encoder resolution needed to trigger the line scanning camera to capture mages is K; when the first encoder pulse signal does not meet a requirement of the resolution needed to trigger the line scanning camera to capture images, the detection device further comprises a servo motor and a second encoder; the resolution of the second encoder is K2, wherein the second encoder is mounted on the servo motor; the first encoder pulse signal triggers the servo motor to rotate; a servo motor controller enables the rotation speed ratio of the servo motor and the driving roller to be alpha, wherein alpha is equal to K1*K2 / K; and the servo motor rotates to drive the second encoder to generate a second encoder pulse signal. Compared with the prior art, the machine vision detection device provided by the invention can meet the resolution requirement for triggering the line scanning camera to capture images by using existing ordinary encoders on the market, and has advantages of simple structure and low cost.
Owner:ZHONG CHAO GREAT WALL FINANCIAL EQUIP HLDGCO +1
Plate making device and plate making method of silk screen printing plate
The invention discloses a plate making device and a plate making method of a silk screen printing plate. According to the plate making device of the silk screen printing plate, an upper computer is used for converting an original data format of graphic data of a preset silk screen printing plate graph into a data format which can be recognized by a data processing plate; the data processing plateis connected with the upper computer, and the data processing plate is used for carrying out data processing on the received graphic data; a laser emitter is used for emitting a laser beam; a laser collimator and an imaging module are sequentially arranged on a conveying path of the laser beam; the laser collimator is used for shaping the laser beam; and the imaging module is connected with the data processing plate, and the imaging module is used for adjusting the shaped laser beam according to the processed graphic data, so that an image formed by the adjusted laser beam on an original baseplate of the silk screen printing plate is the preset silk screen printing plate graph. According to the technical scheme, the cost of the making device of the silk screen printing plate is reduced, and the difficulty of the imaging algorithm is lowered.
Owner:ADVANCED MICRO LITHO INSTR INC
Ultrathin three-lens imaging lens set
The invention relates to an ultrathin three-lens imaging lens set, in particular to an ultrathin imaging lens set applied to a photographing mobile phone lens and a notebook computer photographing lens. The imaging lens set consists of three lenses with refractive indexes and an open diaphragm; the first lens, the open diaphragm, the second lens and the third lens are arranged in turn from an object side to an image side, wherein the first lens is a positive lens, the front surface of the first lens is a convex surface, and the rear surface of the first lens is a concave surface; the second lens is a negative lens, the front surface of the second lens is a concave surface, and the rear surface of the second lens is a convex surface; and the third lens is a positive lens, the front surface of the third lens is a convex surface, and the rear surface of the third lens is a concave surface. Moreover, each surface of the first lens, the second lens and the third lens consists of a high-order non-spherical plastic lens so as to reduce the cost and meet the resolution requirement of a high-pixel photosensitive element.
Owner:凤凰光学(上海)有限公司
Method terminal for shooting large-resolution photograph
ActiveCN103716541AMeet resolution requirementsFirmly connectedTelevision system detailsColor television detailsObjective informationImage resolution
The invention provides a method a terminal for shooting a large-resolution photograph. The terminal comprises a shooting information acquiring module used for acquiring a present resolution, a present image distance and a present focal length of a terminal shooting module and an object resolution set by a user, an object information calculating module used for calculating an object image distance and an object focal length of the terminal shooting module according to the present resolution, the present image distance, the present focal length and the object resolution acquired by the shooting information acquiring module, an object frame shooting module used for carrying out segmentation shooting of a preset object frame by employing the present resolution, the object image distance and the object focal length, and a complete photograph splicing module used for splicing photographs of each segmentation frame acquired by a segmentation shooting module to acquire a complete photograph of the object frame, wherein the object resolution is greater than the present resolution. The method solves problems of inconsistent sharpness of the object frame photograph after multi-photograph splicing and time consuming in the prior art.
Owner:YULONG COMPUTER TELECOMM SCI (SHENZHEN) CO LTD
Color film substrate, preparation method thereof and display panel
ActiveCN111258111AImprove color gamutMeet resolution requirementsSolid-state devicesNon-linear opticsImage resolutionColor film
The invention discloses a color film substrate, a preparation method thereof and a display panel, which are used for improving the resolution of a display product. The color film substrate comprises an underlayer substrate and sub-pixel areas arranged on the underlayer substrate in an array mode. At least part of the sub-pixel areas comprise light-transmitting layers with grooves and quantum dot microspheres which are located in the grooves and correspond to the light-emitting colors of the sub-pixel areas; and the width of the grooves is greater than the diameter of the quantum dot microspheres in the groove.
Owner:BOE TECH GRP CO LTD
Layered electromagnetic braille display device and braille reader
Owner:ZHEJIANG SCI-TECH UNIV
Multi-business bidirectional visual command system for policeman
InactiveCN101437181ALess investmentRealize comprehensive business functionsData switching by path configurationClosed circuit television systemsCommand systemEngineering
The invention discloses a police multi-service bidirectional video command system, which comprises an optical fiber multi-service transmission platform arranged in a municipal police security bureau, grass-root section teams and grass-root police stations thereof, wherein optical cables for the optical fiber multi-service transmission platform of the municipal police security bureau are connected with the optical fiber multi-service transmission platform of each grass-root section team and each grass-root police station; and each functional interface of the optical fiber multi-service transmission platforms of the municipal police security bureau, the grass-root section team and the grass-root police station thereof is connected with a functional device. The police multi-service bidirectional video command system achieves a comprehensive service function integrating speech, image and data.
Owner:新泰市公安局
Three-dimensional laser scanning-based blind person navigation device
InactiveCN102451079AMeet speed requirementsMeet resolution requirementsWalking aidsPhysicsEcho signal
The invention discloses a three-dimensional laser scanning-based blind person navigation device. The device consists of a laser signal generation module, a scanning, transmitting and receiving module, a detection processing module and an information processing navigation module, wherein the laser signal generating module is used for transmitting a detection laser signal which is subjected to frequency modulation; the scanning, transmitting and receiving module is used for three-dimensional spatial scanning in the vertical and horizontal directions; the detection processing module is used for processing a laser echo signal and outputting time delay, phase and frequency shift data of laser echoes; and the information processing navigation module is used for processing detection data to acquire information such as positions, sizes, movement speeds and the like of a barrier in the front, judging danger levels of all barriers and informing blind persons of information of the barriers and moving vehicles which can bring danger to the walking of the blind persons through voice. Simultaneously, an internal global positioning system (GPS) module is used for providing specific positions for the blind persons to realize a voice prompt of an ideal destination path.
Owner:ANHUI AGRICULTURAL UNIVERSITY
Signal output conversion device for dynamic platform monitoring
InactiveCN109708812AMeet resolution requirementsSolve the accuracy problemStatic/dynamic balance measurementSignal conditioning circuitsElectricity
The invention discloses a signal output conversion device for dynamic platform monitoring. The device includes a dynamic platform, wherein the dynamic platform is provided with an inclination angle sensor used for detecting an inclination angle, the inclination angle sensor is electrically connected with a signal conditioning circuit module, the signal conditioning circuit module is electrically connected with a processor to convert an electrical signal measured by the inclination angle sensor into the inclination angle direction and an inclination angle and inputting the information to the processor, and a signal output end of the processor is electrically connected with the display to display the inclination angle direction and the inclination angle of the dynamic platform. The device isadvantaged in that the signal conditioning circuit module is arranged between the signal output end of the inclination angle sensor and the processor, detected inclination angle value data can be processed, a problem that accuracy of A / D conversion of the processor is reduced as the inclination angle detected by the inclination angle sensor is directly transmitted to the processor is effectivelysolved, and resolution requirements of the processor for A / D conversion are met.
Owner:GUIZHOU UNIV
Discrete cosine transform measurement base sorting method
ActiveCN111161234AHigh resolutionMeet resolution requirementsImage enhancementImage analysisRapid imagingImage resolution
The invention relates to a discrete cosine transform measurement base sorting method, which comprises the following steps of: (1) setting M*M pixels of a square image according to expected image resolution initialization parameters, M=2n, and n=1, 2,...; (2) generating a complete DCT measurement base group through inverse discrete cosine transform; (3) selecting a proper real value d, and constructing a function fd(i,j); (4) respectively taking values of i=1, 2,..., M, j=1, 2,..., M, and sequentially obtaining values of M2 fd as a sorting basis; and (5) indexing the PM(i,j) to generate a sequence of the PM(i,j) during measurement, and sorting according to M2 fd(i,j) values from small to large. According to the method, a measurement base does not need to be stored, and rapid imaging can berealized through rapid transformation, associated iteration or a compressed sensing algorithm.
Owner:BEIJING INST OF AEROSPACE CONTROL DEVICES
Tube lens and automatic optical detection equipment
ActiveCN111736303ASmooth goingLarge field of viewMaterial analysis by optical meansMountingsOphthalmologyOptical axis
The invention discloses a tube lens and automatic optical detection equipment. The tube lens comprises a first lens group with positive focal power, the first lens group comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object plane to an image plane along an optical axis, the first lens has positive focal power, the secondlens has negative focal power, the third lens has positive focal power, the fourth lens has positive focal power, and the fifth lens has negative focal power. According to the tube lens and the automatic optical detection equipment provided by the invention, large-view-field imaging is realized.
Owner:SHANGHAI YUWEI SEMICON TECH CO LTD
Method and tool for assisting operator to make standard identity card photo
ActiveCN110288531AFast preparationMeet resolution requirementsImage analysisGeometric image transformationImaging processingImage resolution
The invention discloses a method for assisting an operator in making a standard identity card photo, relating to the technical field of image processing. The method comprises the steps of positioning six key points of a nose, a right eye, a left eye, a right ear, a left ear and a head top tracing top end of a head in an original image; according to the identity card making standard, calculating candidate boundaries for an operator to select, after the operator selects the candidate boundaries, automatically zomming an original image into a standard image according to the candidate boundaries, wherein the zoomed and cut head portrait meets the resolution requirement, and achieving rapid making of a standard identity card photo. The invention also discloses a tool for assisting the operator in making the standard identity card photo, and the tool can be applied to the field of intelligent image processing by being combined with the method.
Owner:SHANDONG INSPUR SCI RES INST CO LTD
Method and device for distributing memory of coding channels
ActiveCN104735384AReduce occupancyReduce memory costTelevision system detailsColor television detailsCurrent channelDistributed memory
The invention relates to a method and device for distributing memory of coding channels. The method includes the steps of dividing a public cache pool into a plurality of cache areas, determining one of the cache areas in the public cache pool as a memory unit of a first reestablished frame corresponding to the first channel, releasing the memory unit of the first reestablished frame to the public cache pool when determining an original reference frame corresponding to the first channel as a first reference frame, releasing the memory unit of the original reference frame corresponding to the first channel to the public release pool when determining the first reestablished frame as the first reference frame, determining the memory unit released by a previous channel to the public cache pool as the memory unit of a second reestablished frame corresponding to the current channel, releasing the memory unit of the second reestablished frame to the public cache pool when determining the original reference frame corresponding to the current channel as a second reference frame, and releasing the memory unit of the original reference frame corresponding to the current channel to the public cache pool when determining the second reestablished frame as the second reference frame.
Owner:HUAWEI TECH CO LTD
Method and device for allocating encoding channel memory
ActiveCN104735384BMeet resolution requirementsReduce occupancyTelevision system detailsColor television detailsComputer hardwareCurrent channel
The present invention relates to a method and device for allocating encoding channel memory, comprising: dividing a public buffer pool into multiple buffer areas; determining one of the multiple buffer areas in the public buffer pool as the first channel The memory unit of the first reconstructed frame; when it is determined that the original reference frame corresponding to the first channel is used as the first reference frame, the memory unit of the first reconstructed frame is released to the public buffer pool; when it is determined that the first reconstructed frame is used as the first reference frame When the frame is used as the first reference frame, the memory unit of the original reference frame corresponding to the first channel is released to the public buffer pool; the memory unit released from the previous channel to the public buffer pool is determined as the second reconstruction corresponding to the current channel The memory unit of the frame; when it is determined that the original reference frame corresponding to the current channel is used as the second reference frame, the memory unit of the second reconstructed frame is released to the public buffer pool; when it is determined that the second reconstructed frame is used as the second reference frame , release the memory unit of the original reference frame corresponding to the current channel to the public buffer pool.
Owner:HUAWEI TECH CO LTD
Method and device for measuring grid frequency
ActiveCN107228980AEffective filteringReduce distractionsFrequency analysisSignal-to-noise ratio (imaging)Correlation filter
The invention discloses a method and device for measuring grid frequency. The method comprises the following steps: obtaining sampling data collected by a power grid and carrying out auto-correlation filtering processing on the sampling data; dividing the filtered sampling data into first sampling data and second sampling data; carrying out windowing processing on the first sampling data and the second sampling data based on a second-order convolution Hanning window to determine first windowing sampling data and second windowing sampling data obtained after windowing processing respectively; determining a first phase of the first windowing sampling data and a second phase of the second windowing sampling data; and determining grid frequency according to the first phase and the second phase. The method adopts equal-data-length auto-correlation double filtering, so that in-band white noise can be filtered effectively, and SNR (signal to noise ratio) can be improved greatly; and through the second-order convolution Hanning window, spectral interference can be reduced greatly, and the method has a good signal-to-noise ratio and good spectral leak suppression ability.
Owner:BEIJING SMARTCHIP MICROELECTRONICS TECH COMPANY +2
Terahertz Spectral Feature Extraction Method Based on Convex Combined Kernel Function Principal Component Analysis
ActiveCN105279379BHigh feature discriminationHigh feature validitySpecial data processing applicationsFrequency spectrumSignal on
The present invention discloses a terahertz spectroscopy feature extraction method based on convex combination kernel function principal component analysis, and relates to the field of spectrum analysis and substance type detection technologies. The method comprises: acquiring a time domain observed signal, filtering noise information by a frequency terahertz spectrum curve obtained from a discrete fourier transformation, performing cubic spline interpolation on the spectrum curve, performing resampling by intercepting comparable data in a same frequency range and completing data normalization; and performing a convex combination kernel function mapping on a sample after completing preprocessing, performing dimension reduction on a mapped basis function matrix to finally realize terahertz spectroscopy feature extraction, and analyzing intra-cluster, inter-cluster relationships of dimension reduced data. According to the terahertz spectroscopy feature extraction method based on convex combination kernel function principal component analysis, the number and high resolution of a spectrum sample are not required, and the effect of a interference signal on the feature extraction can be fully reduced, so that the feature extraction and a low dimension representation of the terahertz frequency domain spectroscopy are realized in the case of unknown substance types and numbers, and the method has a distinct cluster effect.
Owner:KUNMING UNIV OF SCI & TECH
Large-light-flux high-resolution flight time measuring lens
PendingCN113238344AImprove signal utilizationExpand the scope of recognitionElectromagnetic wave reradiationOptical elementsCamera lensIlluminance
The invention discloses a large-light-flux high-resolution time-of-flight measuring lens. The large-light-flux high-resolution time-of-flight measuring lens comprises a first lens to a sixth lens sequentially distributed from an object side to an image side along an optical axis, each of the first to sixth lenses comprises an object side surface which faces the object side and enables imaging light to pass through and an image side surface which faces the image side and enables the imaging light to pass through; the first lens has negative diopter; the second lens has negative diopter; the third lens has positive diopter; the fourth lens has positive diopter; the fifth lens has positive diopter; and the sixth lens has negative diopter. The optical imaging camera lens is only provided with the six lenses with the refractive indexes. According to the measuring lens, the signal utilization rate can be improved, and the recognition range can be enlarged; distortion is managed and controlled, and the situation of effective pixel loss caused by distortion is reduced; the relative illuminance is controlled, and the relative illuminance is ensured to be uniform under the condition of large light transmission; the resolution reaches the high resolution level in the TOF field, and the resolution requirement of a next-generation TOF sensor can be met.
Owner:XIAMEN LEADING OPTICS
Pet detector, pet detector setting method and detection method
ActiveCN105425270BShorten the transmission distanceHigh-resolutionRadiation intensity measurementLight guideEngineering
The invention provides a positron emission tomography (PET) detector, a method for setting the PET detector and a detecting method thereof. The PET detector comprises the components of a crystal array which comprises a plurality of crystal units that are arranged in an array manner and light splitting structures that are arranged on the surfaces of the crystal units, wherein the light splitting structure define the light outlet surface of the crystal array; and a semiconductor sensor array which is arranged relative to the light outlet surface of the crystal array and is suitable for receiving photons from the light outlet surface, wherein the semiconductor sensor array comprises a plurality of semiconductor sensors which are arranged in an array manner. Through arranging the light splitting structures on the crystal units, an effect which is similar with the effect obtained through arranging a light guide plate between the crystal array and the semiconductor sensors is realized. The transmission distance of the photon can be effectively shortened, and furthermore light transmission loss caused by the light guide plate can be prevented, thereby improving resolution of the PET detector.
Owner:SHANGHAI UNITED IMAGING HEALTHCARE
Three-stage comparator system suitable for medium-low precision high-speed low-power consumption ADC (Analog to Digital Converter)
PendingCN114679161AReduce power consumptionLower Offset VoltagePower saving provisionsElectric signal transmission systemsSoftware engineeringHemt circuits
The invention requests to protect a three-stage comparator system suitable for an ADC (Analog to Digital Converter) with medium and low precision, high speed and low power consumption, which comprises a first-stage four-input two-output dynamic small signal preamplifier, a second-stage two-input two-output dynamic small signal preamplifier and a latch, wherein the dynamic pre-amplifier comprises an input differential pair transistor, a tail charge source and a charge steering branch; the latch includes an input stage, a latch stage, and an output stage. The invention aims to improve all modules in a comparator circuit into a dynamic structure, so that the circuit is in an open-circuit state when no control time sequence is input, quiescent current is eliminated, and the power consumption is further reduced. And on the other hand, the offset voltage of the input end of the comparator is reduced through the gain multiple of the two-stage dynamic preamplifier, so that the precision of the comparator is guaranteed. The innovation point lies in that compared with a traditional architecture, the full-dynamic three-level structure has a remarkable effect of reducing the circuit power consumption and the offset voltage on the basis of the full-dynamic three-level structure.
Owner:重庆中易智芯科技有限责任公司
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