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31 results about "Discrete transformation" patented technology
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Multi-unmanned aerial vehicle route planning method based on bee colony collaborative foraging algorithm
InactiveCN103471592AOvercoming initialization sensitivity issuesImprove stabilityConjoint controlsNavigational calculation instrumentsRoute planningDiscrete transformation
The invention belongs to the field of unmanned aerial vehicle technology, and more specifically relates to a multi-unmanned aerial vehicle route planning method which can be used for multi-unmanned aerial vehicle target tracking, route optimization, cooperative management, cooperative flight, and task distribution. The multi-unmanned aerial vehicle route planning method comprises following steps: detailed information of route planning task is initialized, and coordinate discrete transformation is performed; parameters of the bee colony collaborative foraging algorithm is initialized; route cost of each unmanned aerial vehicle is calculated; current route cost is calculated according to a current position by each unmanned aerial vehicle; guide aerial vehicles are selected by followed aerial vehicles, wherein one followed aerial vehicle is recruited by each guide aerial vehicle; the current route is abandoned and a new route is searched; parameters of optimized route are saved, and an optimal value is calculated; inspection is performed so as to determine whether an upper limit of iteration number is reached. The multi-unmanned aerial vehicle route planning method is capable of resolving the initialization sensitive problem of a traditional intelligent optimization route planning method, and can be used for improvement of accuracy of the algorithm so as to obtain an optimal solution or a second best solution sufficiently close to the optimal solution, and improve stability of route planning and search efficiency.
Owner:HARBIN ENG UNIV
Shearlet transform and fast bilateral filter image denoising method
InactiveCN106127711APromote localizationImprove filtering effectImage enhancementImage analysisUltrasonographyImage denoising
The invention discloses a shearlet transform and fast bilateral filter image denoising method, which comprises the steps of: 1) acquiring an envelope signal of a noise image by using a noise imaging system, and establishing a medical ultrasonic image model; 2) carrying out multiscale and multidirectional decomposition on the medical ultrasonic image model after logarithmic transformation obtained in the step 1) by utilizing a pyramid filter bank; 3) performing threshold method contraction processing on a two-dimensional discrete shearlet transform coefficient of a high-frequency part in each subband image obtained in the step 2); 4) using a fast bilateral filter for filtering shearlet coefficients of low-frequency parts in the step 2); 5) and conducting shearlet inverse transform processing on all the coefficients processed in the step 3) and the step 4), so as to obtain a denoised medical ultrasound images. The introduction of the fast bilateral filter in the shearlet transform and fast bilateral filter image denoising method can effectively improve the denoising performance, and greatly increase the processing efficiency.
Owner:ZHEJIANG COLLEGE OF ZHEJIANG UNIV OF TECHOLOGY
Coupled quadrilateral grid level set scheme for piezoelectric ink-jet simulation
ActiveUS7117138B2Easy to controlOvercome problemsElectric/magnetic detection for well-loggingTesting/calibration apparatusPhysical spaceHyperbolic partial differential equation
Methods for finite-difference-based inkjet simulation enable more precise control of ink droplet size and shape. A discrete transformation (mapping) is constructed so that a quadrilateral grid in physical space is transferred to the uniform square grid in a computational space. Since the grid in the computational space is square, numerical finite difference differentiation can be easily done. Governing partial differential equations, including a viscosity term, a surface tension term, and a level set convection equation for two-phase flows, are derived on the quadrilateral grid and then transformed to the computational space for application on the uniform square grid. A stable and powerful numerical algorithm is developed to solve the derived and transformed equations to enable finite-difference-based ink-jet simulation.
Owner:KATEEVA
Medical ultrasonic image de-noising method based on normal inverse Gaussian model
InactiveCN106097280APreserve edge detailMulti-resolutionImage enhancementImage analysisDiseaseSonification
The invention discloses a medical ultrasonic image de-noising method based on a normal inverse Gaussian model. The method comprises the following steps of 1), collecting an envelope signal of a noise image by means of a noise imaging system, and establishing a medical ultrasonic image model; 2), performing multidirectional decomposition on the medical ultrasonic image model after logarithmic transformation by means of a pyramid filter set; 3), performing threshold method adaptive contraction processing on a two-dimensional discrete shearlet transformation coefficient of a high-frequency part in each sub-band image; 4), performing filtering on the shearlet coefficient of the low-frequency part in the step 2) by means of a three-side filter; and 5), performing shearlet inverse transformation processing on all coefficients after processing of the step 3) and the step 4), thereby obtaining the medical ultrasonic image after de-noising. The medical ultrasonic image de-noising method can well restrain spot noise and furthermore can facilitate a doctor in performing disease condition analysis.
Owner:ZHEJIANG COLLEGE OF ZHEJIANG UNIV OF TECHOLOGY
Water turbine speed regulator embedded control object model simulation method
The invention discloses a water turbine speed regulator embedded control object model simulation method. A water turbine model, a generator model and a fault diagnosis module are embedded in a water turbine speed regulator; through acquiring basic parameters of an actual controlled water turbine and a generator set, the water turbine model and the generator model are respectively abstracted into Laplace transfer function expressions; differential discrete transformation of the Laplace transfer function expressions is carried out for program calculation, water turbine guide vane relay feedbackis acquired to input to the water turbine model, output of the water turbine model is inputted to the generator model, the generator rotation speed and the active power output are calculated; the generator rotation speed and an active power signal are fed back to an actual speed regulator cabinet, and rotation speed and power closed loop control on a speed regulation system is realized. The methodis advantaged in that the method is independent from external simulation equipment, the simulation test and fault diagnosis of the speed regulation system can be realized through utilizing self resources of the speed regulator, and factory test integrity of the speed regulator equipment is improved.
Owner:NANJING NARI GROUP CORP
Method for encoding a light field content
In one embodiment, it is proposed a method for encoding a light field content. The method is remarkable in that it comprises: —obtaining, for a set of light rays (401) associated with said light field content, four coordinates per light ray from a two planes parametrization (2000; 402, 403) of said light field content; —obtaining (2001), for each light ray from said set, two coordinates from said four coordinates, corresponding to a projection of said light rays from said set onto a plane (404, 405, P) perpendicular to two planes used in said two planes parametrization, defining points in a first 2D ray diagram (Π(χ1, χ2), Π(χ1, χ2)); —applying (2002) a discrete Radon transform on said first 2D ray diagram (Π(χ1, χ2), Π(χ1, χ2)) that delivers lines of interest in said first 2D ray diagram; —encoding (2003) said lines of interest into encoded lines of interest; and —storing (2004) said encoded lines of interest.
Owner:INTERDIGITAL VC HLDG INC
Multiple-stable-state stochastic resonance weak signal detection method based on wavelet and parameter compensation
InactiveCN104408288AAdjust the amplitudeHigh energySpecial data processing applicationsBand-pass filterStochastic resonance
The invention discloses a multiple-stable-state stochastic resonance weak signal detection method based on wavelet and parameter compensation. The method comprises the following steps: implementing parameter compensation on a noise-containing weak signal, and multiplying a signal parameter, a noise parameter and system parameters by a compensation parameter to counteract the influence of a damping term so as to detect a high-frequency weak signal; implementing multiscale wavelet discrete transformation on the compensated signal to obtain multiple signals at different scale frequencies, adjusting the amplitude of the signal at each scale, and implementing reconstruction; implementing multiple-stable-state stochastic resonance treatment on the reconstructed signal so that each frequency section of a to-be-detected signal is enhanced, implementing band-pass filtering resynthesis on the output of each frequency section to obtain an enhanced multi-frequency weak signal, implementing envelope demodulation analysis on the disposed signal, and analyzing an envelope spectrogram to realize the detection on the weak signal. By applying the method, the energy of an output signal can be improved greatly; the multi-frequency weak signal submerged by a strong noise background is favorably extracted; the detection accuracy is high.
Owner:YANSHAN UNIV
Method and/or OFDM device for SC-FDMA data transmission
ActiveUS8422572B2Less complex data processingReduce power consumptionTransmission control/equalisingFrequency-division multiplexSignal onData signal
In a method and / or an OFDM device for SC-FDMA data transmission, a sequence of input data is transformed by means of a discrete transformation as transformed data signals of coded and modulated data signals on first frequency channels into a first frequency space over a first number of frequencies. The transformed data signals are mapped on second frequency channels in a second frequency space with a larger second number of frequencies. The transformed data signals on the second frequency channels are inverse-transformed using an inverse transformation. Data inversely transformed in such a way are provided for transmission. The transformed data signals are mapped into a frequency range of the second frequency channels in such a way that a constant component of the transformed data signals is mapped centrally within the frequency range.
Owner:NOKIA SIEMENS NETWORKS GMBH & CO KG +1
Method and device for calculating a discrete orthogonal transformation such as FFT or IFFT
InactiveUS6904445B1Quick calculationFacilitates addressingCode conversionComplex mathematical operationsOrthogonal transformationDiscrete transform
The invention comprises a method for calculating an orthogonal discrete transform on the basis of the DIT method in prescribed intermediate steps with the following steps: the data are read from a memory organized on page-for-page basis; the intermediate step prescribed by the transform is carried out; the resulting data are stored in a buffer memory; and the resulting data are written page-for-page from the buffer memory to the memory organized on a page-for-page basis. Suitable discrete orthogonal transforms are FFT, IFFT, DCT, IDCT and transforms of similar structure.
Owner:MAXLINEAR INC
A method for intelligently detecting and tracing anti-counterfeit watermark of red wine package
InactiveCN109087114AReduce loadImprove robustnessImage data processing detailsCommerceFault toleranceArnold transform
A method for intelligently detecting and tracing the anti-counterfeit watermark of red wine package mainly comprises the following steps: A. establishing an anti-counterfeit watermark intelligent detecting and tracing system of red wine packaging, embedding an image watermark signal into the red wine packaging through discrete transformation; B. dividing the digital watermark image of red wine packaging on the market into block, and scrambling and extracting image watermark information by using two-dimensional Arnold transform; C. the control center of the detection system setting a digital watermark agent, and sending the agent to the remote target host, and the agent intelligently identifying and detecting the extracted image watermark through the genetic algorithm; D. if the watermark is detected to be infringing, after the agent is moved, the position is notified to the control center, real-time position and communication are carried out, and an intelligent detection and tracking method for the anti-counterfeit watermark of the red wine packaging is completed. The method has strong robustness and fault tolerance, mobile watermarking agent does not need the continuous support ofthe network, and has the functions of cross-platform continuous operation, self-control and movement, which can carry out intelligent detection, reduce network load and improve detection efficiency.
Owner:龙口盛福达食品有限公司
System and method for motion editing multiple synchronized characters
ActiveUS20120075349A1Image analysisCathode-ray tube indicatorsInteraction timeComputer graphics (images)
Disclosed are a system and a method for motion editing multiple synchronized characters. The motion editing system comprises: a Laplacian motion editor which edits a spatial route of inputted character data according to user conditions, and processes the distortion of the interaction time; and a discrete motion editor which applies a discrete transformation while the character data is processed.
Owner:SEOUL NAT UNIV R&DB FOUND
Transformer online monitoring and fault diagnosis method
ActiveCN112327218AMachine part testingSubsonic/sonic/ultrasonic wave measurementTransformerEngineering
The invention discloses a method applied to online monitoring and fault diagnosis of a transformer. The method comprises four steps. The method comprises the following steps of: 1, acquiring instantaneous values of n paths of signals such as vibration, current, voltage, temperature and the like of different measuring points or different phases of a transformer by using various sensors; 2, respectively processing the acquired n paths of signals by discrete S transformation, and forming a complex matrix of n channels by calculation results; 3, carrying out modulo operation on each element in then-channel complex matrix to obtain an n-channel real matrix, namely a feature image of the signal; and 4, inputting the feature image of the signal into the trained unsupervised deep learning framework to obtain a diagnosis result.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
Arc detecting method for grounding fault of overhead bare conductor through trees
ActiveCN110108971AImprove accuracySimple calculationTesting dielectric strengthFault location by conductor typesMeasurement pointHarmonic
The invention discloses an arc detecting method for grounding fault of an overhead bare conductor through trees. The arc detecting method comprises the steps that discrete transformation is conductedon real-time collected three-phase voltage signals and three-phase current signals, and a voltage residual sequence and a current residual sequence are obtained; the voltage residual sequence is a changing value of the three-phase voltage signals before and after changing, the current residual sequence is a changing value of the three-phase current signals before and after changing; summation values in all sliding windows of the voltage residual sequence are calculated, and whether an arc exists in a distribution line or not is judged according to the summation values; the sliding windows aretime sequence windows with specified time lengths; if the arc exists, matrix multiplications of the voltage residual sequence and the current residual sequence in all the sliding windows are calculated; and whether the arc exists in a branch line behind a measured point or not is determined according to the matrix multiplications. According to the arc detecting method for grounding fault of the overhead bare conductor through the trees, the nonlinear higher harmonic content of travelling waves of the voltage and current can be extracted, calculation is easy, and the accuracy of arc detecting can further be improved.
Owner:YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
Similar item detection
A method to determine image similarities. The method may include obtaining a first image and a second image and determining a discrete transform difference between a first discrete transform of the first image and a second discrete transform of the second image. The method may also include determining multiple first intensity vectors for the first image and determining multiple second intensity vectors for the second image. The method may also include determining an intensity vector difference between the multiple first intensity vectors and the multiple second intensity vectors and determining a color difference between a first color histogram of the first image and a second color histogram of the second image. The method may also include determining a similarity between the first image and the second image based on the discrete transform difference, the intensity vector difference, and the color difference.
Owner:EBAY INC
System and method for motion editing multiple synchronized characters
ActiveUS9030479B2Image analysisCathode-ray tube indicatorsInteraction timeComputer graphics (images)
Disclosed are a system and a method for motion editing multiple synchronized characters. The motion editing system comprises: a Laplacian motion editor which edits a spatial route of inputted character data according to user conditions, and processes the distortion of the interaction time; and a discrete motion editor which applies a discrete transformation while the character data is processed.
Owner:SEOUL NAT UNIV R&DB FOUND
HVS (Human Visual System)-based objective quality evaluation method for three-dimensional (3D) information
Owner:TIANJIN UNIV
Multiplication Methods, Non-Transitory Computer-Readable Media, and Multiplication Devices
ActiveUS20220085970A1Public key for secure communicationComputations using residue arithmeticEffective solutionAlgorithm
Efficient polynomial multiplication for Accelerated Fully Homomorphic Encryption (FHE). An efficient method for large integer and polynomial multiplication in a ring using negacyclic convolution and discrete Galois transform with arbitrary primes is described. The method is adapted to work with arbitrary primes that support Gaussian arithmetic. Dealing with non-Gaussian primes gives rise to another problem of how to find primitive roots of unity and of (i). An efficient solution to find those roots of interest is provided.
Owner:AGENCY FOR SCI TECH & RES
Method and system for quickly realizing image noise reduction based on MPA&BIB3D
The invention discloses a method and a system for quickly realizing image noise reduction based on MPA&BIB3D. In the first stage, different noise reduction methods (such as discrete transformation, wavelet transformation and the like), different partitioning scales and different parameters are adopted to carry out hard threshold noise reduction on an image needing noise reduction, a plurality of images with different noise reduction levels are obtained, then weighted average is carried out on all the images, and a temporary noise reduction image is obtained; in the second stage, the original image block is read block by block, then a plurality of big blocks (bb) containing the current block are generated, a denied bb (dbb) corresponding to the bb in the previous stage is found, the power spectrum of the dbb is solved, the Wiener coefficient is solved, frequency domain transformation is carried out on the bb, then the bb is multiplied by the Wiener coefficient to obtain a new frequency domain value, inverse transformation is carried out to obtain bb after noise reduction, and a noise reduction result corresponding to the current block is taken out; and a weighted average value of all the noise reduction results is solved as a noise reduction result of the current block, and a final noise reduction image after circulation is obtained.
Owner:CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
Method and apparatus for computing electromagnetic scattering properties of structures and reconstruction of approximate structures
ActiveCN105814489BSemiconductor/solid-state device testing/measurementOptically investigating flaws/contaminationVolume integral equationClassical mechanics
A method of computing the electromagnetic scattering properties of a structure comprising materials of different properties and the structure is periodic in at least one transverse direction and extends in a perpendicular direction, comprising: by analyzing a plurality of modes in at least one transverse direction Each corresponding mode in , performs a pseudospectral polynomial (Chebyshev) expansion in the vertical direction multiplied by the integral of the 1D Green's function using the same sample points in the orthogonal direction for all of the modes (1350 ), numerically solve the volume integral equation for electromagnetic scattering for each mode. The integration is performed by solving a regularized linear system of equations between the first (1116) and second (1120) discrete transformation steps to compute (1118) the values of the regularized Chebyshev polynomial coefficient vector (γ). The results of the numerical solution are used to calculate the electromagnetic scattering properties of the structure.
Owner:ASML NETHERLANDS BV
Scalable video coding with grid motion estimation and compensation
A scalable coder having a grid motion estimation and compensation module (110), a motion compensation temporal filtering module (105), a scalable coding module (115), a discrete transformation module (120), and a packetization module (135). The grid-motion estimation and compensation module (110) outputs a scalable motion vector from the source video data, supplied resolution and bit rate parameters. The motion compensation temporal filtering module (105) generates, from the source video data and the scalable motion vector, a residual image corresponding to the difference between the present and previous image frames. The scalable coding module (115) is coupled to receive and encode the scalable motion vector. The discrete transformation module (120) is configured to receive and domain transform the supplied video to a sequence of coefficients. The packetization module is coupled to the scalable coding module (115) and the discrete transformation module (120), and is operable to combine the encoded scalable motion vector and the sequence of coefficients into a packet.
Owner:AGENCY FOR SCI TECH & RES
Error concealment in video communications systems
The invention puts forward a method, an apparatus, and a system for error concealment of video communications. The method includes determining, by a processor in an encoding process, a current block of a current slice of a current picture of a video sequence for error concealment, determining recovery data of the current block, wherein the recovery data comprises at least one of a coefficient of adiscrete transform performed to the current block and similarity data associated with a first block similar to the current block, and the first block is in a first slice different from the current slice, and transmitting the current block and the recovery data using a network, wherein the current block is transmitted as in-band data and the recovery data is transmitted as out-of-band data.
Owner:AGORA LAB INC
An Image Encryption Method Based on Multi-parameter Fractional Discrete Tchebichef Transform
ActiveCN107292805BSolve the image encryption problemImprove securityImage data processing detailsKey spaceAlgorithm
The invention discloses an image encryption method based on multi-parameter fractional-order discrete Tchebichef transformation, and relates to the technical field of digital image processing and information safety. The method comprises the steps: employing the transformation order number of fractional orders of an image block, the initial value of a generation sequence and system parameters as the secret key of image encryption, and then carrying out the encryption of an image. The image decryption process is an inverse process of the above process, and comprises the steps: decrypting the encrypted image through a right secret key and a wrong secret key, and respectively obtaining a right decrypted image and a wrong decrypted image. Experiment analysis indicates that the method provided by the invention is very high in safety. The method increases the secret key space, and improves the safety of an encryption system. In addition, a ciphertext image obtained through the method provided by the invention is a real-value image, and the size of the ciphertext image is the same as the size of an original image, thereby facilitating the displaying, transmission and storage.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Method for transforming continuous-time filter to discrete-time filter
ActiveCN103176406AImprove performanceSuitable for engineering practical applicationAdaptive controlSystems designPartial differential equation
The invention provides a method for transforming a continuous-time filter to a discrete-time filter. The method includes: sampling input quantity and output quantity of a controlled system, and utilizing an identification algorithm for obtaining a continuous-time model of the system; constructing the continuous-time filter according to the continuous-time model; adopting a partial differential equation method to compute a coefficient matrix of the discrete-time filter according to coefficients in a continuous-time filter equation and adopted time of a discrete system; and constructing a discrete-time filter structure. The discrete-time filter is obtained by performing discrete transformation to the designed continuous-time filter. Compared with an existing discrete-time filter design method, the method has the advantages that discretization processes of a controlled object and filter designing processes based on the discrete system are decreased, and by utilizing advantages of a filter design theory based on a continuous-time system, the filter excellent in performances can be designed, system design and development time can be saved, and the method is particularly suitable for practical engineering application of digital control systems.
Owner:WISDRI ENG & RES INC LTD
Method for encoding a light field content
In one embodiment, it is proposed a method for encoding a light field content. The method is remarkable in that it comprises: —obtaining, for a set of light rays (401) associated with said light field content, four coordinates per light ray from a two planes parametrization (2000; 402, 403) of said light field content; —obtaining (2001), for each light ray from said set, two coordinates from said four coordinates, corresponding to a projection of said light rays from said set onto a plane (404, 405, P) perpendicular to two planes used in said two planes parametrization, defining points in a first 2D ray diagram (Π(χ1, χ2), Π(χ1, χ2)); —applying (2002) a discrete Radon transform on said first 2D ray diagram (Π(χ1, χ2), Π(χ1, χ2)) that delivers lines of interest in said first 2D ray diagram; —encoding (2003) said lines of interest into encoded lines of interest; and—storing (2004) said encoded lines of interest.
Owner:INTERDIGITAL VC HLDG INC
Scalable video coding with grid motion estimation and compensation
A scalable coder having a grid motion estimation and compensation module (110), a motion compensation temporal filtering module (105), a scalable coding module (115), a discrete transformation module(120), and a packetization module (135). The grid-motion estimation and compensation module (110) outputs a scalable motion vector from the source video data, supplied resolution and bit rate parameters. The motion compensation temporal filtering module (105) generates, from the source video data and the scalable motion vector, a residual image corresponding to the difference between the present and previous image frames. The scalable coding module (115) is coupled to receive and encode the scalable motion vector. The discrete transformation module (120) is configured to receive and domain transform the supplied video to a sequence of coefficients. The packetization module is coupled to the scalable coding module (115) and the discrete transformation module (120), and is operable to combine the encoded scalable motion vector and the sequence of coefficients into a packet.
Owner:AGENCY FOR SCI TECH & RES
Discrete conversion operational apparatus
InactiveCN1407481AAvoid waitingDigital data processing detailsCode conversionDiscrete cosine transformDiscrete transform
The invention relates to a device (FFTP) for computing discrete transforms. The device comprises a local memory (RAM2) for registering results of sub-transform computations, a sub-transform computation comprising several computation layers. The device is characterized by computation means (CAL_M) which are capable of interlacing computation layers of two or several consecutive sub-transforms of the same size.
Owner:PENDRAGON WIRELESS LLC
A Method of Converting Continuous Time Filters to Discrete Time Filters
ActiveCN103176406BImprove performanceSuitable for engineering practical applicationAdaptive controlSystems designPartial differential equation
The invention provides a method for transforming a continuous-time filter to a discrete-time filter. The method includes: sampling input quantity and output quantity of a controlled system, and utilizing an identification algorithm for obtaining a continuous-time model of the system; constructing the continuous-time filter according to the continuous-time model; adopting a partial differential equation method to compute a coefficient matrix of the discrete-time filter according to coefficients in a continuous-time filter equation and adopted time of a discrete system; and constructing a discrete-time filter structure. The discrete-time filter is obtained by performing discrete transformation to the designed continuous-time filter. Compared with an existing discrete-time filter design method, the method has the advantages that discretization processes of a controlled object and filter designing processes based on the discrete system are decreased, and by utilizing advantages of a filter design theory based on a continuous-time system, the filter excellent in performances can be designed, system design and development time can be saved, and the method is particularly suitable for practical engineering application of digital control systems.
Owner:WISDRI ENG & RES INC LTD
Turbulent image denoising method
ActiveCN107230189BIncreased PSNR valueImprove visual effectsImage enhancementImage analysisImage denoisingThresholding
The invention discloses a turbulent image denoising method, comprising the following steps: performing single-layer two-dimensional discrete wavelet transform on the noisy turbulent image; extracting high-frequency coefficients and performing fast discrete Curvelet transform on the noisy turbulent image; The threshold T is estimated by the Yeesian criterion, and the adaptive selection method of the threshold is improved to obtain the optimal threshold and obtain a denoised turbulent image. The present invention provides a turbulent image denoising method, which can well protect image detail information, suppress boundary artifacts, and significantly improve visual effects. At the same time, the invention achieves higher peak signal-to-noise ratio and lower mean square error, and effectively removes the noise of the turbulence degraded image.
Owner:CHANGCHUN UNIV OF TECH
On-line debugging method of servo system of two-axis two-frame photoelectric image stabilization platform
ActiveCN113189956BReal-time regulationIntuitive controlProgramme controlElectric testing/monitoringControl engineeringClassical mechanics
The invention relates to a servo system online debugging method of a two-axis two-frame photoelectric image stabilization platform. The method is as follows: calibrate the open-loop transfer model of each loop; for any loop, set the expected design bandwidth of the loop as and the initial time Gain parameters of the loop controller, recursively obtain the estimated value of the expected gain parameter and the bandwidth error of the loop controller; perform discrete transformation on the estimated value of the gain parameter and the preset zero position parameter to obtain the discretized control parameters, and use this group of discretized The control parameters are closed-loop tested to obtain the corresponding test curves; the discrete control parameters corresponding to the ideal test curves are solidified as ideal discrete control parameters to the servo control board to complete the debugging of the platform servo system. The invention can perform real-time and intuitive servo system regulation on the platform, has simple and convenient operation, and saves manpower and time costs.
Owner:CHANGCHUN TONGSHI PHOTOELECTRIC TECH CO LTD
A method and device for performing error concealment in video communications
The present invention proposes a method, device and system for error concealment in video communication, including determining the current block of the current slice of the current image of the video sequence used for error concealment by the processor during the encoding process, which is the current block determining recovery data, wherein the recovery data includes at least one of the following: coefficients of discrete transformation performed on the current block and similarity data related to a first block similar to the current block, and the slice where the first block is located is the same as The current slice is not the same, and the current block and recovery data are sent over the network, where the current block is sent as in-band data and the recovery data is sent as out-of-band data.
Owner:AGORA LAB INC
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