66 results about "Differential threshold" patented technology

The invention discloses a video shot detection method based on histogram improvement and a clustering algorithm, and relates to image processing techniques. According to the method, the histogram improvement and the clustering algorithm are adopted to compute an intersection of histograms of two adjacent frames of images, and whether a shot change happens is judged according to histogram similarity; if the shot change happens, secondary detection on a shot boundary of the intersection of the histograms of the two adjacent frames of images is carried out by utilizing interframe gray scale / color difference values, pixel difference value computation on each block is carried out respectively by adopting non-uniform block weighting processing, pixel difference values and preset block frame differential threshold values are compared to obtain identification variables, the identification variable of each block is weighted and summarized, and the weighing and summarizing values and the preset block differential threshold values are compared to carry out shot detection. The video shot detection method improves shot detection accuracy and solves the problems of shot false detection, frame number discontinuity, and the like.

A differential protection system for power transformers using Rogowski coils as current sensors can support an inrush current detection method based on sensing lows in the derivative of the sensed current. Effective detection of power transformer inrush conditions can enable blocking of a protection relay during inrush where the differential current may exceed a differential threshold value indicative of a fault without the presence of an actual fault. The outputs of the Rogowski coils, being proportional to the first time derivative of the sensed current, may be useful in the inrush detection method. Also, with reduced saturation concerns, the Rogowski coil protection system may employ a single slope response with increased sensitivity. A discrete time sampling technique for identifying low di / dt portions within the sensed current also may be useful in detecting power transformer inrush conditions.

In sophisticated semiconductor devices, high-k metal gate electrode structures may be provided in an early manufacturing stage wherein the threshold voltage adjustment for P-channel transistors may be accomplished on the basis of a threshold voltage adjusting semiconductor alloy, such as a silicon / germanium alloy, for long channel devices, while short channel devices may be masked during the selective epitaxial growth of the silicon / germanium alloy. In some illustrative embodiments, the threshold voltage adjustment may be accomplished without any halo implantation processes for the P-channel transistors, while the threshold voltage may be tuned by halo implantations for the N-channel transistors.

A method for reducing loads acting on a wind turbine in response to transient wind conditions is disclosed. The method may generally include determining an actual value for a blade parameter of a rotor blade of the wind turbine using a first sensor associated with the rotor blade, monitoring a secondary operating parameter of the wind turbine using a second sensor, determining a predicted value for the blade parameter based on the secondary operating parameter, comparing the actual value to the predicted value and performing a corrective action to reduce the loads acting on the wind turbine if the actual value differs from the predicted value by at least a differential threshold.

The invention discloses a dynamic setting method of a differential threshold for online monitoring of transformers. The method includes the following steps: classifying and identifying the historicaldata of a transformer monitored in different operating environments and seasons; preprocessing the classified and identified historical data, and removing abnormal data from the historical data; usinga method based on K-Means clustering to dynamically calculate the discrimination threshold of the transformer based on the historical data with abnormal data removed; and based on a Spark distributedparallel computing framework, constructing a transformer equipment comprehensive warning model of threshold alarm based on the discrimination threshold and trend analysis, so as to differentially monitor the discrimination threshold of the transformer. The calculation time of the dynamic threshold is greatly shortened while the accuracy of alarm is improved.

Foreground objects of interest are distinguished from a background model by dividing a region of interest of a video data image into a grid array of individual cells that are each smaller than that a foreground object of interest. More particularly, image data of the foreground object of interest spans a contiguous plurality of the cells. Each of the cells are labeled as foreground if accumulated edge energy within the cell meets an edge energy threshold, if color intensities for different colors within each cell differ by a color intensity differential threshold, or as a function of combinations of said determinations in view of one or more combination rules.

A method of monitoring operation of a dosing system for treating exhaust of an engine includes monitoring a downstream temperature of an exhaust downstream of the dosing system and injecting a dosing agent. A control module determines a temperature differential threshold based on an amount of dosing agent injected and calculates a temperature differential. The control module further evaluates operation of the dosing system based on the temperature differential and the temperature differential threshold.

The invention relates to an electrocardio signal transmission method based on a self-adaptive codebook, belonging to the technical field of wireless communication. The method comprises the following steps of: detecting and marking monitoring signals by a differential threshold method and a wavelet analysis method by preprocessing standard electrocardio analog signals collected by a body surface; regulating the self-adaptive codebook and fixing code vector selected in the codebook by adopting a rule of the minimum weighted mean square error; substituting the residue difference signals with the selected code vector; and adjusting the fitting speed of the code information source electrocardio signals and the order of a fitting function by a transmission end according to the estimation result of the channel to realize information source channel combination control transmission of electrocardio signals. In the invention, the variation of the channel environment is taken into account when electrocardio data is compressed, and low-consumption transmission is realized in case that the complexity of the traditional hardware is maintained.

A system and method for path planning of autonomous vehicles based on gradient are disclosed. A particular embodiment includes: generating and scoring a first suggested trajectory for an autonomous vehicle; generating a trajectory gradient based on the first suggested trajectory; generating and scoring a second suggested trajectory for the autonomous vehicle, the second suggested trajectory being based on the first suggested trajectory and a human driving model; and outputting the second suggested trajectory if the score corresponding to the second suggested trajectory is within a score differential threshold relative to the score corresponding to the first suggested trajectory.

The invention discloses a method and a system for detecting road traffic incidents. The method and the system select traffic occupancy parameters as main parameters of traffic incident detection, and judge whether the traffic incidents exist or not by utilizing the posture that the traffic occupancy parameters basically form a linear growth with the improvement of the traffic crowding degree and using speed parameters as an auxiliary so as to improve the accuracy of the traffic incident detection and the scientificity of decision. The method comprises the following steps of: (1) through the sampling analysis of traffic parameters of a road section, setting a traffic occupancy differential threshold value and a speed threshold value of the road section; and (2) acquiring the traffic parameters of the road section in real time, and judging whether the traffic incidents happen or not by comparing the change of the traffic occupancy with the time with the traffic occupancy differential threshold value and the speed parameters with the speed threshold value.

An integrated circuit in a PET imaging system with a plurality of photo detectors is provided. A plurality of differential transimpedance amplifiers with differential inputs and differential outputs is provided, wherein differential inputs for each differential transimpedance amplifier of the plurality of differential transimpedance amplifiers are electrically connected to a photodetector. A plurality of level crossing analog-to-digital converters is provided wherein differential inputs for each level crossing analog-to-digital converter of the plurality of level crossing analog-to-digital converters are electrically connected to differential outputs of a differential transimpedance amplifier, wherein each level crossing analog-to-digital converter of the plurality of level crossing analog-to-digital converters, comprises a plurality of differential comparators with differential inputs and differential threshold inputs, wherein the differential inputs are electrically connected to the output of the differential outputs of the differential transimpedance amplifier electrically connected to the level crossing analog-to-digital converter and a clock.

A differential threshold voltage level detection circuit receives a differential voltage pair as an input, applying each component of the differential pair to an individual voltage shifting circuit. Each voltage shifting circuit is configured with a regulated current producing a shifted and a non-shifted version in-phase. For a shifted set of output differential voltages, the shift magnitude is proportional to the current entering a shifting circuit and is configured to be less than a peak-to-peak magnitude of the differential voltage to be detected. A current mirror within the detector contains a current reference configured to produce a current to be passed through a voltage generator. The current magnitude is sufficient to generate a regulated voltage output to the two current regulating devices that supply the voltage shifting circuits. An overlap detector receiving both differential voltage pairs produces a signal indicating an input is at a detection threshold.

The invention discloses a non-contact oxyhemoglobin saturation measuring method based on an imaging device. The method is mainly applied to measuring non-contact oxyhemoglobin saturation under daily ambient light illumination conditions. According to the method, two optical filters with different wave bands (470nm and 520nm) are utilized for respectively reading video including human face areas according to a grey value, calculating the grey average of the human face areas in each frame and drawing time domain curves of the grey average with frame number as variable quantity. The two obtained wave-section-different time domain curves of the grey average are processed to be pulse contours with a smooth base line through an FFT band-pass smoothing. The averaging process is carried out on the wave-shaped curves to obtain I470DC and I520DC. According to the two oscillograms, the extreme value and the number of extreme values in a detecting area are calculated through differential threshold values, the detected pulse wave crest value is averaged, and I470AC and I520AC are obtained. The value can be obtained by combining the I470DC, the I520DC, the I470AC and the I520AC. Finally, oxyhemoglobin saturation is determined according to the fitted curves.

The invention relates to an on-line monitoring system for a dissolved gas in transformer oil based on an embedded platform. Aiming at the problems that an existing transformer online monitoring deviceis easily influenced by the phenomena, such as that the chromatographic base line jitter, the chromatographic base line shifts, the chromatographic base line has the abnormal points, the interferenceis large, the waveform is irregular, etc., in the chromatographic peak recognition, so that the misjudgment and the missed judgment of the chromatographic peak are caused and the existing device is lack of self-adaption and self-learning capabilities for misjudgment and the missed judgment of the chromatographic peak, and accordingly the measurement distortion of the gas component data is caused,and the accuracy of the fault diagnosis is further influenced. Under an embedded Vxworks operating system, the on-line monitoring system of the present invention adopts a differential threshold filtering method, a rough penalty method, the first-order and second-order derivatives, a PSO-SVM (particle swarm optimization support vector machine) and other algorithms to carry out the interference peak identification and the gas component classification on a series of chromatographic peaks in chromatographic curve sequence data after oil-gas separation, and calculates the gas concentration value.According to the system, the accuracy and stability of the chromatographic analysis are greatly enhanced, and the performance of an online monitoring device for the dissolved gas in the transformer oil is improved.

A trigger circuit generates a trigger signal when a differential input signal crosses a differential threshold voltage level. A first side of the differential input signal is applied to a first terminal of a first load termination resistor. A second side of the differential signal is applied to a first terminal of a second load termination resistor. A first side of the differential threshold voltage level is applied to a second terminal of the first load termination resistor. A second side of the differential threshold voltage level is applied to a second terminal of the second load termination resistor. A comparator generates the trigger signal when a voltage level at the first terminal of the first resistor exceeds a voltage level at the first terminal of the second resistor.

The invention relates to a low-power portable electrocardiograph monitoring system, and belongs to the field of portable human-body electrocardiograph monitoring. The low-power portable electrocardiograph monitoring system comprises an electrocardio-electrode, a lead wire, an electrocardiosignal conditioning circuit, a single chip control circuit, a low-power bluetooth circuit, a rechargeable lithium battery, a power supply management circuit, a smart phone and a server. According to the low-power portable electrocardiograph monitoring system, right-leg driving, active power filtering, double-instrument operational amplifier and digital smooth filtering are adopted, an electrocardiosignal is effectively extracted, an R-wave calculated heart rate is accurately detected by adopting a differential threshold method, a real-time electrocardiogram is drawn by utilizing the smart phone, electrocardiogram data can be transmitted to the server, and a doctor can examine and analyze the electrocardiogram data at the server. Low-power design is adopted, the size is small, and the low-power portable electrocardiograph monitoring system is suitable for crowds needing to pay attention to the self electrocardio situations whenever and wherever.

A method of monitoring operation of a dosing system for treating exhaust of an engine includes monitoring a downstream temperature of an exhaust downstream of the dosing system and injecting a dosing agent. A control module determines a temperature differential threshold based on an amount of dosing agent injected and calculates a temperature differential. The control module further evaluates operation of the dosing system based on the temperature differential and the temperature differential threshold.

The invention discloses a questionnaire survey question updating method and device, a storage medium and computer equipment, relates to the technical field of data processing, and solves the problem that questions are randomly extracted from a question bank to serve as updated questions only according to the number of questions which are not answered by a user in existing questionnaire survey question replacement. The method comprises the following steps: acquiring facial expression information of five sense organs of a user through camera equipment according to an answering destination serialnumber; comparing the facial expression information of the five sense organs with preset micro-expressions, and performing numeralization on the facial expression information of the five sense organsaccording to the difference after comparison; calculating a difference value of the facial expression information of the five sense organs according to the numeralized numerical value, and comparingthe difference value with a preset difference threshold value; if the difference value is smaller than the preset difference threshold value, carrying out incredible marking; analyzing the feature words of the questions, searching replacement questions from a question bank according to the feature words, and updating the replacement questions to the questionnaire survey system.

The invention discloses a natural crack identification method and system based on micro-electrode logging data. The method comprises a step of determining substrate resistivity characteristics of a crackless formation, a step of obtaining resistivity characteristics of a cracked formation and determining resistivity response characteristics of the cracked formation, a micro-electrode logging resistivity crack identification threshold, a micropotential and a microgradient crack resistivity differential threshold, a step of carrying out flex point analysis on a micro-electrode logging resistivity curve, obtaining micro-electrode logging resistivity flex point data, and extracting a depth position of crack development; and a step of identifying a crack according to the substrate resistivity characteristics of the crackless formation, the micro-electrode logging resistivity crack identification threshold, the micropotential, the microgradient crack resistivity differential threshold and the micro-electrode logging resistivity flex point data and calculating a logging response index of the crack. According to the method and the system, the recognition and evaluation of a single crack are achieved, the uncertainty factors of a traditional method are reduced, the precision is improved, and a reliable data basis is provided for the three-dimensional crack modeling of a cracked oil andgas reservoir.

The invention discloses an action identification method based on a wearable device. Data is collected by using a single inertial sensor node, and compared with the scheme of multiple nodes, the actionidentification method has the advantages of being more convenient and comfortable to wear. Complete motion data are automatically sliced via a differential threshold detection method, thereby effectively reducing the interference of non-action data. Based on the analysis of five kinds of action features, a standard mean value, a standard deviation, a kurtosis, a skewness and a minimum value are extracted to serve as identification and classification feature values, and dimension reduction processing is performed on the features to reduce the redundancy of feature information. For the linear indivisible problem, a simpler kernel function is designed to reduce the computational complexity. A multi-classification process is implemented by multi-level SVM. Compared with the traditional 1V1 strategy, the design has the advantages of reducing the number of sub-SVMs, meanwhile adjusting the classification priority according to the size of the gravity center distance to improve the classification accuracy, and an effective scheme is provided for a wearable action identification design based on inertial data features.

The invention discloses a sensor weak signal data collecting method and device. The segmented transmission of an electrical signal collected by a sensor is carried out according to data packet; the electrical signals collected by the sensor are differentially processed to obtain a differential signal, the differential threshold de-noising of the electrical signal is calculated, and the differential threshold is dynamically adjusted; therefore, the differential threshold can be dynamically adjusted when the sensor in a strong interference environment collects a weak electrical signal, and the previous differential threshold can be corrected to be close to the true value of the electrical signal. Therefore, the algorithm has good robustness and strong fault tolerance, which can make the datacollected in the strong interference environment be accurate, and is suitable for continuous collecting of signals by sensors of a low-speed embedded microprocessor.

A method provided for detecting stratification within a vehicle battery. The method includes determining whether a state of charge of the vehicle battery is greater than a predetermined state of charge threshold. A determination is made whether a working capacity of the vehicle battery is greater than a working capacity threshold. A determination is made whether a voltage differential of the vehicle battery is greater than a predetermined voltage differential threshold. Stratification is detected within the vehicle battery in response to the state of charge, the working capacity, and the voltage differential being greater than the state of charge threshold, the working capacity threshold, the voltage differential threshold, respectively.