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126 results about "Normalized correlation" patented technology
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Method and device for efficient frame erasure concealment in linear predictive based speech codecs
ActiveUS20050154584A1Improve concealmentPromote recoveryError preventionTransmission systemsStability parameterFrequency spectrum
The present invention relates to a method and device for improving concealment of frame erasure caused by frames of an encoded sound signal erased during transmission from an encoder (106) to a decoder (110), and for accelerating recovery of the decoder after non erased frames of the encoded sound signal have been received. For that purpose, concealment / recovery parameters are determined in the encoder or decoder. When determined in the encoder (106), the concealment / recovery parameters are transmitted to the decoder (110). In the decoder, erasure frame concealment and decoder recovery is conducted in response to the concealment / recovery parameters. The concealment / recovery parameters may be selected from the group consisting of: a signal classification parameter, an energy information parameter and a phase information parameter. The determination of the concealment / recovery parameters comprises classifying the successive frames of the encoded sound signal as unvoiced, unvoiced transition, voiced transition, voiced, or onset, and this classification is determined on the basis of at least a part of the following parameters: a normalized correlation parameter, a spectral tilt parameter, a signal-to-noise ratio parameter, a pitch stability parameter, a relative frame energy parameter, and a zero crossing parameter.
Owner:VOICEAGE EVS LLC
Systems and methods for stitching image blocks to create seamless magnified images of a microscope slide
Scanned image portions of a virtual slide are stored in accord with a positional index metric associated to each image's location in a mosaic representation of the entire physical slide and a normalized correlation search is performed on next neighbor regional image blocks. A set of relative positional offset values and a correlation coefficient is determined for a regional image block and a next neighbor regional image block. A portion of the regional image blocks is viewed as a field of view of a display and a composite of the portion of regional image blocks is stitched together in accord with the set of relative positional offset values and the correlation coefficient, such that only the blocks comprising the portion are stitched. Moving the field of view of the display causes additional regional image blocks to be displayed, where image stitching is subsequently performed only with respect to the additional regional image blocks brought into the new field of view.
Owner:CARL ZEISS MICROIMAGING AIS +1
Method and device for efficient frame erasure concealment in linear predictive based speech codecs
ActiveUS7693710B2Improve concealmentPromote recoveryError preventionTransmission systemsStability parameterFrequency spectrum
Owner:VOICEAGE EVS LLC
Watermarking with cone-forest detection regions
In a watermarking system, an embedder embeds one of several alternative watermark patterns that represent the source message using side information to improve robustness. A detector uses normalized correlation to test all of the patterns, indicating that the source message is present if any one of the patterns is detected. The detection process results in a detection region that is the union of several disjoint cones, or a cone-forest, in media space.
Owner:NEC RES INST +1
Decimated Bisectional Pitch Refinement
A method and system for refining an estimated pitch period estimate based on a coarse pitch useful for performing frame loss concealment in an audio decoder as well as for other applications. A normalized correlation at the coarse pitch lag is computed and used as the current best candidate. The normalized correlation is then evaluated at the midpoint of the refinement pitch range on either side of the current best candidate. If the normalized correlation at either midpoint is greater than the current best lag, the midpoint with the maximum correlation is selected as the current best lag. After each iteration, the refinement range is decreased by a factor of two and centered on the current best lag. This bisectional search continues until the pitch has been refined to an acceptable tolerance or until the refinement range has been exhausted. During each step of the bisectional pitch refinement, the signal is decimated to reduce the complexity of computing the normalized correlation.
Owner:AVAGO TECH INT SALES PTE LTD
Method for tracing position and pose of 3D human face in video sequence
InactiveCN101763636AImprove tracking performanceImprove accuracyImage analysisCrucial pointPrincipal component analysis
The invention provides a method for tracing the position and pose of a 3D human face in a video sequence. In the method, based on the principal component analysis, by using a deformable 3D grid model, minimizing the distance between a key point on the grid model and a corresponding key point on an input image, the model can fit the head figure of a user; the human face texture can be obtained by using the 3D model at an initial phase, so as to render human face images under different poses; the feature points can be selected in the rendered images, and a corresponding position can be searched on the input image; the matching faults can be removed by using a random sampling mode; then, mode pose changed parameters can be estimated according to the corresponding relationship between the feature points, so as to update a hypothetical state; finally, a distance between the rendered image and an actual image can be calculated by using the average normalized correlation algorithm, so as to calculate a hypothetical weight. Experiments show that the method can effectively trace the pose of the 3D head in the video.
Owner:INST OF AUTOMATION CHINESE ACAD OF SCI +1
Method and apparatus for acquistion and tracking of orthogonal frequency division multiplexing symbol timing, carrier frequency offset and phase noise
InactiveUS7532693B1Amplitude-modulated carrier systemsOrthogonal multiplexPhase noiseCarrier frequency offset
Owner:MARVELL ASIA PTE LTD
Radio communication timing synchronization method, cell searching method and system
ActiveCN101388723ARealization of cell searchReduce processing complexityRadio transmission for post communicationOrthogonal multiplexTime domainSignal quality
The invention discloses a method for timing and synchronizing wireless communication, a method for searching districts and a system thereof. The method fully utilizes the time domain repetitiveness of a main synchronizing signal in a 5ms period and comprises: firstly, adopting predetermined step length sliding time domain cross-correlation to realize blind timing coarse synchronization with low complexity and without local synchronizing signal reconstruction, simultaneously, using normalized correlation processing to resist strong interference, finally, realizing timing fine synchronization with high precision, and correcting receiver integer multiple residual frequency deviation simultaneously. The method can realize timing and synchronization rapidly and accurately in particular in environment with low signal to interference and noise ratio, thereby realizing district searching in a long term evolution wireless communication system. The method can realize downlink timing and synchronization when the signal quality is in the sensitivity position of a terminal receiver and in the environment with strong interference.
Owner:RDA CHONGQING MICROELECTRONICS TECH CO LTD
Method for automatically registering scanned document images
InactiveCN101872475AFast locationAccurate locationImage analysisCharacter and pattern recognitionDocumentationPoint pair
The invention discloses a method for automatically registering scanned document images, which comprises the following five steps: detection by using improved characteristic points, the coarse estimation of a rotation parameter, the coarse matching of characteristic points, the elimination of the erroneous matching characteristic points, and precise matching. Concretely, the five steps comprise: detecting the characteristic points of a standard scanned document image and a scanned document image to be matched by using the improved characteristic-point detection algorithm; estimating the primary rotation angle of the scanned document image to be matched relative to the standard scanned document image according to the positions of the characteristic points; calculating matched characteristic point pairs of the characteristic points in the standard scanned document image and the scanned document image subjected to primary rotation by using a normalized correlation algorithm; eliminating the erroneous matching by using an improved random sample consensus robust algorithm; and calculating the matching parameter between the standard scanned document image and the coarsely-rotated scanned document image to be matched according to the positions of the precise matching point pairs searched from an eight neighborhood, and making the parameter act on the coarsely-rotated scanned document image to be matched so as to obtain the registered image.
Owner:INST OF AUTOMATION CHINESE ACAD OF SCI
Method and Apparatus for Implementing Seek and Scan Functions for an FM Digital Radio Signal
ActiveUS20080298440A1Amplitude-modulated carrier systemsPlural information simultaneous broadcastDigital radioWave shape
A method for detecting a digital radio signal includes the steps of receiving the digital radio signal, developing a correlation waveform having a peak that corresponds to a symbol boundary, normalizing the correlation waveform, calculating a peak value of the normalized correlation waveform, and dwelling on the received digital radio signal when the peak value exceeds a predetermined threshold. A receiver that performs the method is also provided.
Owner:IBIQUITY DIGITAL CORP
Fully automatic calibration method for high performance camera under complicated background
InactiveCN105096317AHigh precisionImage enhancementImage analysisCamera auto-calibrationCheckerboard
With an object of solving problems existing in the prior art, the invention provides a fully automatic calibration method for a high performance camera under a complicated background. The method is combined with a Robust's checkerboard corner detection method, and two groups of checkerboards corners are adopted to serve as filters on the basis of the characteristics of the corners to filter marker images. Eight filters of two types are reduced to four filters of two types, which means that the wave processing amount halves and therefore, the calibration speed increases. Further, the method utilizes a Zhang's camera calibration method to mark the camera calibration parameters. The method utilizes the marked camera calibration parameters to standardize images to be corrected, and a normalized correlation of the standardized images is calculated, and then sub-pixel precision checkerboard corners are obtained. The method then re-projects the coordinate of the checkerboard corners onto image space to obtain a precise coordinate of the corner image. The newly obtained coordinate of the corners is then substituted into the Zhang's calibration method to obtain new computed camera parameters. By repeating the above steps, a performer can obtain highly precise camera parameters. According to the embodiments of the invention, it is possible for a performer to complete automatic corner detection and camera calibration without having to resort to human-machine interactive operations.
Owner:吴晓军
Auxiliary berthing method and system for vessel
ActiveUS20180012498A1High positioning accuracyGuaranteed smoothImage enhancementImage analysisVisibilityGps receiver
The present invention provides an auxiliary berthing method and system for a vessel. Position information of a vessel relative to a berth is determined by a solar blind ultraviolet imaging method; meanwhile, by a GPS method, an attitude angle of the vessel relative to the berth is determined by at least two GPS receivers. Thus, the vessel can be berthed safely when getting close to the shore at low visibility. Further, in the method and device of the present invention, it can be preferable to integrate coordinate data and angle data received by a solar blind ultraviolet imaging module and GPS signal receiving modules by a normalized correlation algorithm and a data fusion algorithm, so as to improve the positioning accuracy.
Owner:NANJING UNIV 5D TECH
Anisotropic reverse time migration method for quasi-P wave equation in transverse isotropy with a vertical axis of symmetry (VTI) medium
InactiveCN102590859AOvercome precisionOvercoming the limitation of inclination angleSeismic signal processingReverse timeWave equation
The invention relates to an anisotropic reverse time migration method for a quasi-P wave equation in a transverse isotropy with a vertical axis of symmetry (VTI) medium. The method comprises the following steps of: (1) performing discrete differentiation on a first-order quasi-P wave equation in a two-dimensional VTI medium and a perfect matched layer (PML) absorption layer boundary equation by adopting staggered meshes to obtain high-order difference formats of forward continuation and reverse continuation of the two equations; (2) performing numeric calculation to obtain a forwards-continued wave field of a shot point and a reverse time continued wave field of a receiver point, and performing normalized correlation operation on the two wave fields to obtain a migration imaging result of each imaging point in a model; and (3) extracting common imaging point gathers from migration results to obtain a final migration profile. By the method, a problem about the migration imaging of intensive transverse speed variation and a high dip angle stratum can be solved; and the influence of anisotropy of the medium is also taken into account, and the good imaging effect of longitudinal wave data acquired from an anisotropic region can be achieved by an anisotropy-theory-based migration method.
Owner:中国石油集团西北地质研究所有限公司
High-speed parallel implementation method and device for template matching based on normalized correlation coefficient
ActiveCN103310228AReduce logic resource consumptionRun fastCharacter and pattern recognitionTotal sum of squaresTemplate matching
The invention discloses a high-speed parallel implementation method and device for template matching based on a normalized correlation coefficient. The method comprises the following steps of reading a real-time graph and template graph data in a corresponding internal RAM (random access memory) buffer block and a real-time graph data buffer RAM, and meanwhile calculating the sum of a template graph gray value and the squared sum of the template graph gray value, and calculating the sum of a real-time graph gray value and the squared sum of the real-time graph gray value at a search position (0, 0); then calculating the sum of the product of the real-time graph gray values of various columns in the first row of the search position of the following columns of the first row in the search position, and the normalized correlation coefficient; and meanwhile, further reading the real-time graph data of a new row in the corresponding internal RAM buffer block and the real-time graph data buffer RAM corresponding position, and calculating the value of the first column in the current row at the same time, and calculating the normalized correlation coefficients of following rows in sequence. The device is composed of a high-speed correlation operator, an external data result memory and a microprocessor.
Owner:NANJING UNIV OF POSTS & TELECOMM
System and method for recognizing markers on printed circuit boards
InactiveUS7110591B2Simple processSetting of parameter is minimizedPrinted circuit aspectsCharacter and pattern recognitionComputer moduleImaging Feature
A system and method for recognizing markers on, e.g., a PCB (printed circuit board). In one aspect, a system for recognizing a marker in an image comprises an image capture module (14) for extracting image features associated with an input image of a ROI (region of interest) captured through a lens 15, an image processor (16) comprising a first marker recognition processor (17) for recognizing a marker in the input image based on a normalized correlation and a second marker recognition processor (18) for recognizing a marker in the input image based on gray value histograms; a training module 19 for building template images and histograms that are used by the image processor (16) to detect a marker in the input image and a database (20) for indexing and storing trained template images and trained histograms.
Owner:SIEMENS AG
Method and apparatus for video object segmentation
ActiveUS20120294530A1Improve compression efficiencyFew artifactImage enhancementImage analysisSpacetimeNormalized correlation
Methods and apparatus for video object segmentation are provided, suitable for use in a super-resolution system. The method comprises alignment of frames of a video sequence, pixel alignment to generate initial foreground masks using a similarity metric, consensus filtering to generate an intermediate foreground mask, and refinement of the mask using spatio-temporal information from the video sequence. In various embodiments, the similarity metric is computed using a sum of squared differences approach, a correlation, or a modified normalized correlation metric. Soft thresholding of the similarity metric is also used in one embodiment of the present principles. Weighting factors are also applied to certain critical frames in the consensus filtering stage in one embodiment using the present principles.
Owner:INTERDIGITAL MADISON PATENT HLDG
Image defect inspecting apparatus and image defect inspecting method
Owner:FUJIFILM BUSINESS INNOVATION CORP
Real-time visual target tracking method based on light streams
InactiveCN104200494ASmall amount of calculationRun fastImage analysisObject tracking algorithmFilter algorithm
The invention discloses a real-time visual target tracking method based on light streams. The method includes: screening feature points rich in textural features, and tracking the feature points between every two frames of images to obtain feature point matching relations; filtering the feature points with large matching errors through various filter algorithms such as normalized correlation coefficients, forward-reverse tracking errors and random consistency detection to retain most reliable feature points so as to obtain the target motion speed in images; using the target motion speed as observation quantity, and estimating through Kalman filtering to generate the target position. Compared with a tracking algorithm, the method has the advantages that the method is unaffected by light, the target can be stably tracked under the conditions that the target moves, a camera moves, the target is blocked for a short term and the like. The method is high in calculation efficiency, and the tracking algorithm is verified for the first time on an ARM platform.
Owner:BEIHANG UNIV
System and method for autonomous PTZ tracking of aerial targets
Owner:PURETECH SYST
Method for realizing color image digital watermark for certificate anti-counterfeiting
InactiveCN101950407ANo lossObjective and accurate deliveryImage data processing detailsColor imageInformation security
The invention relates to a method for realizing a color image digital watermark for certificate anti-counterfeiting and belongs to the technical field of anti-counterfeiting and information security. The technical scheme comprises the following steps of: 1, converting an RGB color space of a color image to an L*a*b* color space; 2, encoding and modulating readable watermark information to generate a colored noise watermark mode; 3, taking an increasing function related to a gradient modulus as a visual control factor; 4, embedding a watermark into an L* luminance component of the L*a*b* color space; 5, performing predictive filtering pretreatment on a watermark image before extracting the watermark and then extracting the watermark by a normalized correlation method; and 6, decoding bits of the extracted watermark into the readable watermark information. The method of the invention improves the correct extraction rate of watermark signals. The scheme has high robustness for resisting printing and scanning attack and can be widely used for the anti-counterfeiting of various certificates.
Owner:JILIN UNIV
Intelligent-texture anti-counterfeiting method based on perceptual hashing
InactiveCN103353990ARealize automatic identificationImprove accuracyImage analysisCommerceFeature extractionNormalized correlation coefficient
Owner:HAINAN UNIVERSITY
Signal detection in multicarrier communication system
ActiveUS20070254594A1Robust detectionSimplifies detection of signalModulated-carrier systemsTransmission monitoringCommunications systemEngineering
A signal detection scheme is provided. According to the provided signal detection scheme, a received signal is correlated in a frequency domain with a reference signal. Additionally, the reception power of the received signal is calculated and the correlation value is normalized with the reception power. Therefore, a single threshold value may be used regardless of the reception power of the received signal when comparing the correlation between the received signal and the reference signal with the threshold value in order to determine whether the received signal is a desired signal or noise.
Owner:NOKIA TECHNOLOGLES OY
Method for positioning spacers of transmission lines by aid of video image processing technology
InactiveCN103177241ASimplified matching the range of location scansGuaranteed real-time positioningImage analysisCharacter and pattern recognitionDigital videoTemplate matching
The invention discloses a method for identifying and positioning spacers of transmission lines by the aid of a video image processing technology, and belongs to the technical field of digital video image processing and online monitoring for transmission lines. The method includes positioning target areas of images and positioning centers of the spacers by processes for normalizing the original images, acquiring direction fields, matching templates and the like; computing the direction fields of the images by a square-gradient algorithm when the target areas are positioned, and combining the direction fields with isotropic consistency information to position the target areas of the images corresponding to the transmission lines; and positioning the centers of the spacers by a histogram-based and normalized-correlation quick template matching algorithm. The quick template matching algorithm sets histogram matching joint threshold values and normalized-correlation matching maximum values as the foundation for judging the matching optimal positions, coordinates with the maximum probabilities in a plurality of matching results are selected to be used as center points of the spacers, and reference information is provided for monitoring conditions of the transmission lines and predicting faults.
Owner:河北能瑞科技有限公司
Image processing device, image processing method, program for the same, and computer readable recording medium recorded with program
ActiveUS20070103482A1Improve accuracyImage enhancementImage analysisNormalized correlationModel image
A determination target region includes a combination of a red gray image, a green gray image, and a blue gray image. A CPU part transforms a three gray value matrixes to a single first data array uniquely associated with a pixel position in the determination target region. The CPU part calculates a normalized correlation value with a single second data array transformed from a model image according to the same predetermined rule, and determines whether or not a match is found with the model image according to whether or not the normalized correlation value exceeds a predetermined threshold value.
Owner:HUAWEI TECH CO LTD +1
TLD-based variable-scale target tracking method suitable for UAVs
ActiveCN106886748AImprove operational efficiencyReal-time processingScene recognitionImaging processingObject tracking algorithm
The invention belongs to the field of image processing and computer vision and particularly to a TLD-based variable-scale target tracking method suitable for UAVs. The method uses a design thought of a tracking-learning-detection (TLD) frame, uses a median optical flow tracker as a tracker, a normalized correlation detector as a detector, and an improved kNN detector as a learning device. Based on the characteristics and difficulties of a UAV detection video sequence, the TLD-based variable-scale target tracking method suitable for UAVs takes account of algorithm performance and adaptability, integrates the advantages of a median optical flow method and a correlation tracking algorithm, and solves the target robust tracking problem of the target tracking of a UAV video processing system when a target is given indefinitely, less pixels of the target to be tracked, unobvious texture, obvious target appearance attitude angle and scale changes, and tracking process real-time performance.
Owner:中国航天电子技术研究院
Method and device for time synchronization and frequency synchronization of LTE system
ActiveCN101827052AWork lessMulti-frequency code systemsTransmitter/receiver shaping networksAutomatic controlPeak value
The invention provides a method and a device for time synchronization and frequency synchronization of an LTE system. The device comprises a normalized autocorrelation unit which is used for normalized autocorrelation to delay a digital baseband signal for an OFDM period, an automatic fractional frequency offset control unit which is used for estimating a fractional frequency offset according to a peak value generated by the normalized autocorrelation unit, and correcting the fractional frequency offset of the digital baseband signal, a primary synchronization signal correlation unit which isused for normalized correlation of the digital baseband signal after the correction of the fractional frequency offset and a local primary synchronization signal with a preset integer frequency offset, a time synchronization unit which is used for time synchronization according to a normalized correlation value, and an integer frequency offset correction unit which is used for estimating an integer frequency offset according to the normalized correlation value and correcting the integer frequency offset of the digital baseband signal after the correction of the fractional frequency offset, thereby realizing the time synchronization and frequency synchronization of the LTE system.
Owner:北京中科晶上科技股份有限公司
Authenticity Determination Method, Apparatus, and Program
ActiveUS20080060079A1Accurate measurementAccurately determineDigital data processing detailsAnalogue secracy/subscription systemsReference RegionReference image
To determine authenticity of a solid body simply and precisely, a reference area of a paper sheet which is genuine is optically read from two different directions, and the image is registered as a reference image. A check area of a paper sheet subjected to the authenticity determination, including the reference area and having a size larger than the reference area, is read from two different directions with a scanner, and data on a partial area having the same size as the reference area are extracted from each set of check data collected by the reading. For a set consisting of the reference image and the check image optically read from the same direction, the value of the correlation with the reference image is repetitively calculated by the normalized correlation method while the partial area is shifted within the check area. The maximum correlation value and the normalized score of the maximum correlation value are compared with respective thresholds to determine the authenticity of the paper sheet. If the paper sheet is determined to be “genuine” for the authenticity determination of each set, the paper sheet subjected to the authenticity determination is finally determined to be “genuine.”
Owner:FUJIFILM BUSINESS INNOVATION CORP
Remote-senstive image interfusion method based on image local spectrum characteristic
InactiveCN1581230AHigh-resolutionEasy to keepImage enhancementRemote sensing image fusionHistogram matching
The present invention relates to a remote-sensing image fusion method based on image local spectral characteristics. Said method combines local correlation moment and local variance of remote-sensing image to make fusion, on the basis of making multispectral image undergo the process of IHS transformation makes I component obtained after transformation and high-spectral image undergo the process of histogram matching treatment, then makes the matched I component and high-spectral image respectively undergo the process of vavelet transformation. For low-frequency component obtained after wavelet decomposition said method adopts the fusion criterion based on local normalized correlation moment to make fusion, and for high-frequency component it adopts the fusion criterion based on variance to make fusion, then reconstructes all the wavelet components after fusion to obtain new I componnet, finally, uses new I component and original components of H and S to make IHS inverse transformation so as to obtain the fusion result.
Owner:SHANGHAI JIAO TONG UNIV
Cell synchronization position filtering method, device and equipment
ActiveCN103428846AImplement filteringImprove the probability of successful location detectionSynchronisation arrangementCell synchronizationLocation detection
The invention discloses a cell synchronization position, device and equipment, and belongs to the technical field of communication. The method includes the steps: respectively extracting at least one SSS (secondary synchronization signal) time domain receiving signal from at least one antenna according to each PSS (primary synchronization signal) synchronization position when detecting the same Cell ID (identity) at a plurality of PSS synchronization positions; respectively calculating normalized correlation of each pre-stored time domain SSS and the SSS time domain receiving signal at each PSS synchronization position to obtain an SSS normalized correlation value based on each PSS synchronization position; determining the PSS synchronization position corresponding to the maximum SSS normalized correlation value as the PSS synchronization position of the Cell ID. By determining the PSS synchronization position of the Cell ID, the detected PSS synchronization positions are filtered, the position detection success probability of the Cell ID is increased, interference elimination accuracy can be improved when interference is eliminated for the Cell ID, and the detection success probability of a target cell is further increased.
Owner:HONOR DEVICE CO LTD
Image defect inspecting apparatus and image defect inspecting method
InactiveUS7239738B2Improve accuracyHigh-precision detectionImage enhancementImage analysisImage extractionDigital data
An image defect inspecting apparatus of the present invention includes a template image producing section for producing a template image from reference image data, a corresponding image extracting section for extracting a predetermined image located at a position corresponding to a template image from digital data of a scanned image for inspection, data embedding sections for embedding desired same pattern data into the template image and the image extracted by the corresponding image extracting section, a normalized correlation value calculation processing unit for acquiring a normalized correlation coefficient from the template image and the extracted image, into which the pattern data is embedded, and a defect judging section for judging as to whether a defect is present by comparing the normalized correlation coefficient acquired by the normalized correlation value calculation processing unit with a predetermined threshold value so as to acquire a large / small relationship thereof.
Owner:FUJIFILM BUSINESS INNOVATION CORP
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