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69 results about "Noise Artifact" patented technology
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An artifact that appears as a point to point signal fluctuation in a uniform material.
Detecting ventricular noise artifacts in an active implantable medical device for pacing, resynchronization and/or defibrillation of the heart
Sensing ventricular noise artifacts in an active implantable medical device for pacing, resynchronization and / or defibrillation of the heart. This device concerns sensing heart rhythm through an endocardial electrode collecting the depolarization potentials, and detecting the myocardium contractions through an endocardial acceleration sensor. The device searches for ventricular noise artifacts (X, Y) by correlating the signals representative of successive ventricular and atrial depolarizations (P, R) with the signals representative of successive acceleration peaks (PEA I). In case of a lack of correlation, a signal of suspicion of ventricular noise is delivered, which temporarily modifies the sensing sensitivity (S) of the sensing circuit.
Owner:SORIN CRM
Imaging apparatus, radiation imaging apparatus, and radiation imaging system
ActiveUS7408167B2Quality improvementLower capability requirementsTelevision system detailsSolid-state devicesRadiation imagingPhotoelectric conversion
An imaging apparatus capable of reducing a line noise artifact in a simple configuration without complicated operations includes: a plurality of pixels arranged in row and column directions and having a photoelectric conversion element and a switch element; a plurality of signal wirings connected to the plurality of switch elements in the column direction; a read out circuit connected to the plurality of signal wirings; and a power source for supplying a voltage to the photoelectric conversion element. With the configuration, the plurality of pixels are classified into a plurality of groups, and the power sources are independently provided for each of the plurality of groups.
Owner:CANON KK
Imaging apparatus, radiation imaging apparatus, and radiation imaging system
ActiveUS20070290143A1Quality improvementLower capability requirementsTelevision system detailsSolid-state devicesRadiation imagingPhotoelectric conversion
An imaging apparatus capable of reducing a line noise artifact in a simple configuration without complicated operations includes: a plurality of pixels arranged in row and column directions and having a photoelectric conversion element and a switch element; a plurality of signal wirings connected to the plurality of switch elements in the column direction; a read out circuit connected to the plurality of signal wirings; and a power source for supplying a voltage to the photoelectric conversion element. With the configuration, the plurality of pixels are classified into a plurality of groups, and the power sources are independently provided for each of the plurality of groups.
Owner:CANON KK
A low-dose CT image processing system based on noise artifact suppression convolutional neural network
PendingCN109166161AEasy to handleReduce radiation dose damageImage enhancementReconstruction from projectionImaging processingProcess module
The invention discloses a low-dose CT image processing system based on a noise artifact suppression convolutional neural network. The system includes: an image preprocessing module, which is used to obtain multiple sets of matched low-dose CT images V<s><ld>and conventional dose CT images V<s><rd> and to subtract V<s><ld> and V<s><ld> to obtain noise artifact image Ns; a noise artifact suppression convolutional neural network building module, which is used for using V<s><ld> as a training image and Ns as a label image to establish a mapped convolutional neural network between V<s><ld> and Ns;a network training module, configured to train a noise artifact suppression convolutional neural network by reducing a loss function of the neural network; a network processing module, which is usedfor inputting a low-dose CT image to be processed V<t><ld> to the mapping convolutional neural network for processing and obtaining a predicted noise artifact image N<t>; and a noise artifact suppression module, which is used for subtracting N<t> from V<t><ld> to obtain a noise artifact suppressed image V<t>. The present invention can effectively suppress noise in low dose CT data Acoustic artifacts, the image quality after processing can meet the clinical analysis, diagnosis and other requirements, and the image effect of low-dose CT imaging is improved.
Owner:SOUTHEAST UNIV
Method and system for combining results of mosquito noise reduction and block noise reduction
In a video system, a method and system for combining results of mosquito noise reduction and block noise reduction are provided. Noise artifacts may be reduced in a video image by generating a first pixel correction value that combines a first and a second noise reduction parameters utilizing a first combination operation. Combining the first pixel correction value and a third noise reduction parameter utilizing a second combination operation may generate a second pixel correction value. New pixel values may be determined for the video image by adding an original pixel value and the pixel correction value. The noise reduction parameters may correspond to results from mosquito and block noise reduction operations. The first and second combination operations may be selected to be a maximum, a minimum, or an addition of the input parameters based on the sign of the input parameters.
Owner:AVAGO TECH WIRELESS IP SINGAPORE PTE
Method and system for detection and rejection of motion/noise artifacts in physiological measurements
InactiveUS20130191035A1Character and pattern recognitionDiagnostic recording/measuringEnvironmental geologyNoise Artifact
Methods and systems for quantitatively detecting the presence of artifacts in physiological measurement data and for determining usable data among those that have been designated to be corrupted with artifacts are presented.
Owner:CHON KI H +1
Modular atomic force microscope
ActiveUS20100275334A1NanotechnologyScanning probe microscopyAtomic force microscopyThermal isolation
A modular AFM / SPM which provides faster measurements, in part through the use of smaller probes, of smaller forces and movements, free of noise artifacts, that the old generations of these devices have increasingly been unable to provide. The modular AFM / SPM includes a chassis, the foundation on which the modules of the instrument are supported; a view module providing the optics for viewing the sample and the probe; a head module providing the components for the optical lever arrangement and for steering and focusing those components; a scanner module providing the XYZ translation stage that actuates the sample in those dimensions and the engage mechanism; a isolation module that encloses the chassis and provides acoustic and / or thermal isolation for the instrument and an electronics module which, together with the separate controller, provide the electronics for acquiring and processing images and controlling the other functions of the instrument. All these modules and many of their subassemblies are replaceable and potentially upgradeable. This allows updating to new technology as it becomes available.
Owner:OXFORD INSTR ASYLUM RES INC
Method and system for block noise reduction
InactiveUS20060171467A1Block noise decreaseTelevision system detailsPicture reproducers using cathode ray tubesPattern recognitionVertical edge
In a video system, a method and system for block noise reduction are provided. Edge parameters based on spatial variance may be determined to detect vertical edges that may result from block noise. These edge parameters may be determined serially. Once detected, pixels neighboring the vertical edges may be filtered and clamped to determine a vertical block noise reduction difference (BNR) parameter. Similarly, edge parameters based on spatial variance may be determined to detect horizontal edges that may result from block noise. These edge parameters may be determined serially. Once detected, pixels neighboring the horizontal edge may be filtered and clamped to determine a horizontal BNR difference parameter. The vertical and horizontal BNR difference parameters may be utilized to reduce block noise artifacts in the video image.
Owner:AVAGO TECH WIRELESS IP SINGAPORE PTE
Motion and noise artifact detection for ECG data
Technologies are provided herein for real-time detection of motion and noise (MN) artifacts in electrocardiogram signals recorded by electrocardiography devices. Specifically, the present disclosure provides techniques for increasing the accuracy of identifying paroxysmal atrial fibrillation (AF) rhythms, which are often measured via such devices. According to aspects of the present disclosure, a method for detecting MN artifacts in an electrocardiogram (ECG) recording includes receiving an ECG segment and decomposing the received ECG segment into a sum of intrinsic mode functions. The intrinsic mode functions associated with MN artifacts present within the ECG segment are then isolated. The method further includes determining randomness and variability characteristic values associated with the isolated intrinsic mode functions and comparing the randomness and variability characteristic values to threshold randomness and variability characteristic values. If the randomness and variability characteristic values exceed the threshold characteristic values, the ECG signal is determined to include MN artifacts.
Owner:WORCESTER POLYTECHNICINSTITUTE
Technique for Enhancing the Quality of Compressed Video Images
InactiveUS20130342690A1Easy to compressReduced noise artifactTelevision system detailsColor television detailsColor imageImage resolution
The scene is illuminated by light pulses at higher intensities at predetermined times than at times between the predetermined times. Images of the scene are captured at the predetermined times to provide a sequence of anchor frames in a stream of images, and images of the scene are captured at times between said predetermined times to provide non-anchor frames in the stream. The anchor and non-anchor frames are then compressed and processed to produce video with greater compression and reduced noise artifacts.The scene is illuminated by light pulses with wavelengths outside the visible range. Upon sensing motion, the scene is illuminated by light pulses to provide video in the visible wavelength range.The scene is illuminated by a sequence of light pulses of different wavelengths when motion is detected in the scene. Different wavelength images of the scene are combined to provide higher resolution colored images without color filtering.
Owner:CABLE TELEVISION LAB
Method and system for mosquito noise reduction
InactiveUS20060171466A1Reducing mosquito noiseColor television with pulse code modulationColor television with bandwidth reductionInterlaced videoNoise reduction
In a video system, a method and system for mosquito noise reduction are provided. Mosquito noise may be detected by determining a block variance parameter for an image block and a local variance parameter for a portion of the image block. The block variance parameter may be based on serially determined horizontal and vertical variance parameters. A clamping limit is also determined based on the block variance parameter, the local variance parameter, a relative weight parameter, and a mosquito core limit parameter. Pixels covered by the local variance may be filtered and the filtered output may be compared to the original pixel values to determine a difference parameter. Different filter values may be utilized for progressive and interlaced video. A mosquito noise reduction (MNR) difference parameter may be determined based on the difference parameter and the clamping limit and may be utilized to reduce mosquito noise artifacts.
Owner:AVAGO TECH WIRELESS IP SINGAPORE PTE
Convolutional neural network-based low-dose CT image decomposition method
ActiveCN108961237AImprove image qualityAchieve decompositionImage enhancementReconstruction from projectionAnatomical structuresSoft x ray
Owner:ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
Signal Artifact Detection and Elimination for Audio Output
A method and apparatus are provided for processing a received digital radio broadcast signal to efficiently remove signal interference artifacts from digital and / or analog signals by using signal quality information extracted from audio samples in one or more buffered audio frames to detect audio frames containing clipped noise artifacts and weaker noise artifacts and to selectively apply anti-interference processing to remove the signal interference artifacts.
Owner:IBIQUITY DIGITAL CORP
System and method for the detection and removal of radio frequency noise artifact from biopotential signals
InactiveUS6985833B2Precise processingElectroencephalographyElectrocardiographyRadio frequencyElectric potential
A system and method of identifying and removing artifact from radio frequency noise from biopotentials identifies epochs contaminated with radio frequency noise. Contaminated epochs are then replaced with recent uncontaminated epochs stored in a buffer, depending on the current level of artifact and the availability of suitable data. Discontinuities arising at the beginning of the replaced epochs are smoothed by means of a windowing function.
Owner:TYCO HEALTHCARE GRP LP
Motion and noise artifact detection for ECG data
Technologies are provided herein for real-time detection of motion and noise (MN) artifacts in electrocardiogram signals recorded by electrocardiography devices. Specifically, the present disclosure provides techniques for increasing the accuracy of identifying paroxysmal atrial fibrillation (AF) rhythms, which are often measured via such devices. According to aspects of the present disclosure, a method for detecting MN artifacts in an electrocardiogram (ECG) recording includes receiving an ECG segment and decomposing the received ECG segment into a sum of intrinsic mode functions. The intrinsic mode functions associated with MN artifacts present within the ECG segment are then isolated. The method further includes determining randomness and variability characteristic values associated with the isolated intrinsic mode functions and comparing the randomness and variability characteristic values to threshold randomness and variability characteristic values. If the randomness and variability characteristic values exceed the threshold characteristic values, the ECG signal is determined to include MN artifacts.
Owner:WORCESTER POLYTECHNICINSTITUTE
System and method of corner noise reduction in an image
InactiveUS20150030258A1Reducing noise artifactNot introduce too much complexityImage enhancementTelevision system detailsPattern recognitionNoise reduction
Systems and methods for reducing noise artifacts in an image are disclosed. A radial distance-based look up table may be used to calibrate a noise property change due to the vignette effect. Based on the look up table, a spatial varying noise reduction level is computed to correct the noise property distortion due to the image vignetting.
Owner:QUALCOMM INC
Modular atomic force microscope
A modular AFM / SPM which provides faster measurements, in part through the use of smaller probes, of smaller forces and movements, free of noise artifacts, that the old generations of these devices have increasingly been unable to provide. The modular AFM / SPM includes a chassis, the foundation on which the modules of the instrument are supported; a view module providing the optics for viewing the sample and the probe; a head module providing the components for the optical lever arrangement and for steering and focusing those components; a scanner module providing the XYZ translation stage that actuates the sample in those dimensions and the engage mechanism; a isolation module that encloses the chassis and provides acoustic and / or thermal isolation for the instrument and an electronics module which, together with the separate controller, provide the electronics for acquiring and processing images and controlling the other functions of the instrument. All these modules and many of their subassemblies are replaceable and potentially upgradeable. This allows updating to new technology as it becomes available.
Owner:OXFORD INSTR ASYLUM RES INC
Electrical wearable capacitive biosensor and noise artifact suppression method
A biosensor of the invention is a capacitive noncontact sensor with two sensor channels split into a plurality of physically interdigitated symmetrical electrodes and shield sections. Two capacitive plates are electrically connected to the two sensor channels. The capacitive noncontact sensor is sized and packaged to be worn by a person to place the capacitive plates close to the skin of the person and form first and second channel input capacitors with the skin. A signal reconstruction circuit obtains a bio signal from the first and second channel input capacitors through the electrodes by reconstructing differences in the two sensor channels. The circuit includes different parasitic input capacitance in the two channels to create channel-specific outputs that depend on input coupling capacitance.
Owner:RGT UNIV OF CALIFORNIA
Reconfigurable self-calibrating adaptive noise reducer
ActiveUS7821578B2Reduce noiseImage enhancementTelevision system detailsPattern recognitionInterlaced video
A video noise reducer reduces the noise artifacts in a video signal. The video noise reducer is reconfigurable to provide spatial noise reduction and temporal noise reduction in either a parallel or cascade architecture. The video noise reducer is self-calibrating by providing estimation modules that estimate the amount of noise in the video signal and a noise injector that confirms the measurement against a known quantity of noise. The video noise reducer is adaptive to solutions in hardware or a combination of hardware and firmware. The video noise reducer is also optimized for efficient memory usage in interlaced video signal processing applications.
Owner:SYNAPTICS INC +1
Motion and noise artifact detection and reconstruction algorithms for photoplethysmogram and equivalent signals
ActiveUS20160220188A1Reduce misreadingSensorsMeasuring/recording heart/pulse ratePattern recognitionPulse oximeters
Owner:WORCESTER POLYTECHNIC INSTITUTE
Denoise MCG Measurements
ActiveUS20130079622A1Easy to optimizeHigh resolutionSensorsTelemetric patient monitoringPower flowImage resolution
A magnetocardiogram (MCG) system with reduced noise artifacts is produced by first creating high-resolution image representations of low-resolution measurements obtained with a magnetic field sensor unit. The high-resolution image representations are created by use of a PCA model that has been trained using a library of ideal, no-noise, high-resolution images. The Biot-Sarvart Law is then used to create a 3D model of a current impulse, given the high-resolution image representations. From the 3D current impulse model, ideal sensor unit measurements as they would have been obtained using a theoretical sensor unit observing the 3D current impulse model are synthesized.
Owner:SEIKO EPSON CORP
Method for eliminating EEG signal noise artifact
ActiveCN109009092AImprove signal-to-noise ratioQuick removalDiagnostic recording/measuringSensorsSignal-to-noise ratio (imaging)Mean square
The invention relates to a method for eliminating an EEG signal noise artifact. The method comprises the steps of performing independent component separation on an EEG signal after denoising processing, then selecting an independent component with an artifact, and finally reconstructing the independent component which does not comprise the artifact for obtaining the EEG signal after noise artifactelimination, wherein independent component separation is based on an improved five-order FastICA algorithm. The improvement of the method is characterized in that an improved updating formula is usedfor updating the separated vectors and the relaxation factor of the independent component; and the independent component which comprises the artifact is selected based on a multi-domain adaptive threshold signal selecting method. According to the method for eliminating the EEG signal noise artifact, not only can a plurality of ocular artifacts be automatically identified and eliminated, but alsoa large amount of EEG information can be reserved. Furthermore the method can well improve the signal-to-noise ratio of the EEG signal and reduce the mean square error of the signal.
Owner:DONGHUA UNIV
Modular Atomic Force Microscope
A modular AFM / SPM which provides faster measurements, in part through the use of smaller probes, of smaller forces and movements, free of noise artifacts, that the old generations of these devices have increasingly been unable to provide. The modular AFM / SPM includes a chassis, the foundation on which the modules of the instrument are supported; a view module providing the optics for viewing the sample and the probe; a head module providing the components for the optical lever arrangement and for steering and focusing those components; a scanner module providing the XYZ translation stage that actuates the sample in those dimensions and the engage mechanism; a isolation module that encloses the chassis and provides acoustic and / or thermal isolation for the instrument and an electronics module which, together with the separate controller, provide the electronics for acquiring and processing images and controlling the other functions of the instrument. All these modules and many of their subassemblies are replaceable and potentially upgradeable. This allows updating to new technology as it becomes available.
Owner:OXFORD INSTR ASYLUM RES INC
On-line artifact removing method synchronizing EEG-fMRI
ActiveCN109222965AMeet data processing speed requirementsLower requirementDiagnostic recording/measuringSensorsSignal-to-noise ratio (imaging)Denoising algorithm
The invention discloses an on-line artifact removing method synchronizing EEG-fMRI. The method comprises the following steps: 1) high-pass filtering of EEG signals; 2) upsampling the filtered signal and synchronizing the EEG signal with the marker emitted by the MRI device; 3) obtain a signal Sr with residual artifacts; 4) residual gradient artifacts are present in the signal Sr, and gradient artifacts template denoising and PCA denoising are constructed to obtain the gradient artifacts canceled signal Sc; 5) ECG is contain in that signal Sc, and a QRS peak of the ECG is detected; 6) clustering the ECG with K-means according to different periods; 7) reintegrate each EEG signal into m-segment EEG signals accord to time sequence, and performing OBS processing on that m-segment EEG signals; 8) according to the time sequence of the original signal, reconstructing EEG signal to obtain EEG signal after removing ECG artifact. The invention can collect EEG signal at the same time of scanning and collecting fMRI image, and real-time remove artifact through denoising algorithm to obtain EEG signal with high signal-to-noise ratio.
Owner:SOUTH CHINA UNIV OF TECH
Method and system for combining results of mosquito noise reduction and block noise reduction
In a video system, a method and system for combining results of mosquito noise reduction and block noise reduction are provided. Noise artifacts may be reduced in a video image by generating a first pixel correction value that combines a first and a second noise reduction parameters utilizing a first combination operation. Combining the first pixel correction value and a third noise reduction parameter utilizing a second combination operation may generate a second pixel correction value. New pixel values may be determined for the video image by adding an original pixel value and the pixel correction value. The noise reduction parameters may correspond to results from mosquito and block noise reduction operations. The first and second combination operations may be selected to be a maximum, a minimum, or an addition of the input parameters based on the sign of the input parameters.
Owner:AVAGO TECH WIRELESS IP SINGAPORE PTE
Cone beam CT noise estimation and suppression method for neural network learning
ActiveCN111899188AReduce distractionsIncrease contrastImage enhancementImage analysisData setNeural network learning
The invention provides a cone beam CT noise estimation and suppression method for neural network learning, and the method comprises the steps of constructing a simulated cone beam CT noise-containingprojection sample data set through the noise priori knowledge of a real cone beam CT projection domain, and achieving the recognition of cone beam CT noise features for neural network learning. According to the method, real cone beam CT noise estimation without manual intervention is completed in a self-adaptive mode through a network model trained by simulation data samples. The method provided by the invention is suitable for cone beam CT noise estimation and suppression of a measured object with any complex structure, the reliability and universality of the method are good, the interferenceand influence of cone beam CT noise artifacts on the image can be reduced to a great extent, and the quality of the cone beam CT image is obviously improved.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Method and system for block noise reduction
InactiveUS8254462B2Television system detailsPicture reproducers using cathode ray tubesPattern recognitionVertical edge
Owner:AVAGO TECH WIRELESS IP SINGAPORE PTE
Method and apparatus for detecting dark noise artifacts
The present invention involves detecting dark noise artifacts in coded images and video. Locations of artifacts in compressed pictures are found. A strength of the artifact per block is determined as is an overall dark noise artifact strength for each picture. Artifact detection and strength assignment is performed by analyzing candidate areas that could be prone to this type of artifact. Multiple features such as block variance, color information, luminance levels and location of the artifact could be used in this process. Also, median filtering may be used on the identified areas to eliminate isolated areas. A final artifact parameter for each picture can be assessed based on the total number of blocks that are classified as dark noise and also the strength of each macroblock.
Owner:INTERDIGITAL MADISON PATENT HLDG
Multi-scale feature generative adversarial network for suppressing artifact noise in low-dose CT image
ActiveCN112598759AQuality improvementHigh speedReconstruction from projectionNeural architecturesData setFeature extraction
The invention belongs to the technical field of CT imaging, and adopts the specific scheme that a multi-scale feature generative adversarial network for suppressing artifact noise in a low-dose CT image is adopted, an LDCT image noise reduction model is selected, an LDCT image and NDCT image data set is constructed, the LDCT image is input into an error feedback pyramid generator network, he pyramid generator network extracts cross-scale features of the LDCT image from different angles, the LDCT image is processed by the error feedback pyramid generator network and then a preliminary noise reduction result graph is output, the NDCT image and the preliminary noise reduction result graph are jointly input into an interleaved convolution discriminator sub-network for iterative training, and afinal noise reduction result graph is output; the error feedback pyramid generator can extract shallow features and deep features in the same scale of the image, increase the richness of feature extraction, improve the discrimination capability of the discriminator, and the multi-scale feature generative adversarial network solves the problem of under-noise reduction or over-noise reduction caused by high similarity between noise artifacts and tissue structure distribution.
Owner:TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
Apparatus for monitoring a cardiac rhythm during cpr
ActiveCN107249684AEasy disposalImprove efficiencyHeart defibrillatorsDiagnostic recording/measuringEmergency medicineCardiac arrhythmia
A defibrillator and method for using a defibrillator which adopts an ECG analysis algorithm that can detect a cardiac arrhythmia in the presence of noise artifact induced by cardio pulmonary resuscitation (CPR) compressions. The apparatus and method offers guidance throughout a cardiac rescue protocol involving both defibrillation shocks and CPR that improves the effectiveness of the rescue, resulting in more CPR "hands-on" time, better treatment of refibrillation, and reduced transition times between CPR and electrotherapy.
Owner:KONINKLJIJKE PHILIPS NV
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