254results about How to "Improve tracking accuracy" patented technology

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.

The invention relates to a movement tracking device for man-machine interaction and a tracking method thereof. The invention comprises a movement tracking device and a target information processing device. The tracking method comprises the following steps of: (1) binding a micro inertial measurement unit and a specified-wavelength light source with a tested target; (2) transmitting target movement parameters to a target information processing system by the movement tracking device; (3) processing the acquired target movement information by the target information processing system; and (4) outputting accurate target movement information to a man-machine interaction interface through a target space coordinate and a movement posture information output interface. The invention provides the device and the tracking method thereof which can be applied to man-machine interaction, virtual reality, and enhancement of a real system and can effectively expand the movement tracking range.

The invention relates to a sun orientation automatic tracking method and a device used for photovoltaic power generation. The detection precision of the existing method and the device is lower. The method is a 24-hour 2D sun orientation automatic tracking method which uses a light intensity sensor to combine photoelectric tracking and sun motion trail tracking. The light intensity sensor detects climate and respectively adopts three different working modes to track the sun orientation in sunny days, cloudy days and rainy days, which solves the influences of climate changes and environment interference on the tracking stability to a certain extent, and simultaneously eliminates the accumulated errors through the closed loop control function of the photoelectric tracking mode, thus being capable of stably implementing sun orientation tracking in 24 hours. The device for realizing the method includes a wave-pass drum, the light intensity sensor, protective glass, a four-quadrant photoelectric detector, a signal processing circuit, a computer and an external clock chip. The invention improves the detection precision and solves the problem of unstable detection signal caused as the sunorientation detector is easy to be interfered by environmental light.

The invention discloses an active solar energy tracing method comprising the following steps: manually adjusting the initial posture of a solar energy device with an illuminated face to ensure that the illuminated face is vertical to an solar incident ray; obtaining current time; by taking the initial posture of the solar energy device and the current time as the references, obtaining device data according to the current time, and adjusting the direction angle and the altitude angle of the solar energy device at fixed time to realize active solar energy tracing. The invention also discloses a device used for the above solar energy tracing method, comprising a solar energy device with an illuminated face, a posture adjusting device of the solar energy device, a current time acquiring device, a controller and a press key system connected with the controller. The tracing method and the device of the invention have favourable precision and stability.

The invention discloses a visual tracking method based on target characteristics and bayes filtration. The method comprises the following steps: a system model and an observation model are established according to the actual motion of a target; the color and the gradient of the target are calculated, similarity function is constructed, and the current observed value of the target is obtained by a particle filter; the state average of particulate matter and the covariance are processed by using karman filtration, thus generating new gauss distribution, then new particulate matter is sampled according the gauss distribution generated, thus calculating weight and output; finally, the particulate matter is sampled again; meanwhile, a partition detection method for the target and the corresponding processing algorithm of shading and non shading are proposed; the visual tracking process is finished. Compared with similar algorithm, the method realizes information complementation between the characteristics by the blending of multi-information, therefore, the target is not easy to be affected by external environmental factors such as light, etc. By adopting the combination of particle filtration and the karman filtration, the tracking accuracy of the whole method is higher, thus improving the tracking performance and being adapted to various complicated environments.

Systems and methods for distance and location tracking a wireless device are disclosed. More specifically, according to one aspect of the present disclosure, a Wireless Area Network-Location Based Services (WAN-LBS) algorithm that utilizes a hybrid Wireless Area Network (WAN) and Global Positioning System (GPS) circuit board and method for seamless indoor and outdoor tracking is disclosed. The WAN-LBS algorithm, in conjunction with the hybrid WAN/GPS circuit board, optimizes the degrees of precision and accuracy for distance measurements in locating a fixed or mobile IEEE 802® device. In one embodiment, the hybrid WAN/GPS circuit board according to the present disclosure integrates the data of a GPS receiver and several IEEE 802 standards based receivers. In another embodiment, the WAN-LBS algorithm according to the present disclosure utilizes received data, acquired by the hybrid circuit board, to calculate distances to the tracking devices, seamlessly in both indoor and outdoor environments.

The invention provides a compound axis tracking system based on a rotary biprism. The system can be used for tracking a fast-moving target with high precision. The device comprises a rotary biprism tracking control device, an imaging assembly, a fast reflecting mirror tracking device and a detector. According to the system, the rotary biprism is controlled to quickly track the moving target, namely, the target enters the image assembly and then is imaged to the detector, a fast reflecting mirror is controlled to deflect according to the miss distance of the target on the detector in order to stably close the target in a detection center, and as a result, high-precision tracking of the fast-moving target can be realized.

The invention relates to a method and a device to automatically track sun according to time control. Based on the basic principle of earth running around sun, the real sun time and declination angle would be calculated. Thus, the elevation and the track running time would be calculated from sunrise to sundown, and the relationship of the tracking running of that day and the next day as well. Then, it would return to the location of sunrise when sundown. The track device is made up of elevation track driver and location track driver. The drivers are made up of reducer that use micro deceleration electromotor or step motor as power a Solar energy collector is fixed on the driver by supporting. The electric machine is controlled by computer. The invention is easy to make, low cost, convenience to maintain, and has a broad application range.

The invention discloses a sliding-mode variable structure control method of a single phase grid-connected inverter based on a multi-resonant sliding mode surface. The method comprises the steps of: firstly, building a linear sliding mode surface according to detected current i1 of an inverter side filter inductor of the single phase grid-connected inverter, the voltage vc of a filter capacitor, the current i2 of a network side filter inductor, and the target output current i1* of a grid-connected inverter system, the target voltage vC* of the filter capacitor and the grid-connected target current i2*; adding a resonant item into the linear sliding mode surface so as to obtain the multi-resonant sliding mode surface; designing a sliding-mode variable structure controller by the multi-resonant sliding mode surface, leading a linear state feedback controller to an original nonlinear controller to obtain a final control quantity modulation wave d(s), and finally comparing the modulation wave with a carrier wave to generate a driving signal for driving a switch tube to act. According to the control method disclosed by the invention, the robustness and dynamic response ability of the grid-connected inverter system are improved; the tracking accuracy of grid-connected current is also improved; the harmonic content is removed, and the control method is simple and easy to achieve.

The invention discloses a face detection and tracking method based on an embedded system, which comprises: an image preprocessing step which comprises downsampling and calculating a gray integral figure; a face detection step in which a large number of non-human face windows are eliminated by a color proportion judgment method and an eye grey characteristic judgment method, then the remaining small number of windows are detected and positioned by a face classifier based on Adaboost algorithm; and a face tracking step in which a simplified method of combining elliptical contour information andcolor histogram information is used. The face detection and tracking method of the invention greatly reduces the computation of face detection, can be applied to electronic products employing the embedded system such as a digital camera, a digital video camera and a mobile phone.

An automatic tracing type solar generator belongs to the technical field of solar electric power generation, which comprises a chassis, a supporting structure with a rotating shaft, a light concentrating thermal-collecting device, an accumulator, a driving device and an automatic tracing controlling device, wherein the supporting structure is connected on the chassis through a first driving device, the light concentrating heat-collecting device is mounted on the rotating shaft of the supporting structure and is connected with the supporting structure through a second driving device, the driving motor and the automatic tracing type controlling device of the two driving devices are electrically connected, and the light concentrating heat-collecting device is electrically connected with the accumulator. The invention has good property and long service life. The automatic tracing type lighting system combines input ends of four sensing devices to judge the position, which increases judging accuracy. The circuit is simple and reliable, power consumption is low, and cost is greatly reduced compared with a single-chip processer tracker. The invention effectively utilizes solar, which is nonpolluting, no discharging, saves energy and protects environment. A light collecting cover can automatically turnover upwards, has the function of snow resistance, rain resistance and automatic protection, and effectively protects the damage of a motor.

Certain embodiments of the present invention provide methods and systems for calibration of an imaging camera or other image acquisition device. Certain embodiments include characterizing a transformation from a coordinate system of an imager to a coordinate system of a first sensor positioned with respect to the imager using a first off-line calibration. Certain embodiments also include characterizing a transformation from a coordinate system of an imaging camera source to a coordinate system of a second sensor positioned with respect to the imaging camera source using a second off-line calibration. Additionally, certain embodiments include quantifying intrinsic parameters of the imaging camera source based on a transformation from the coordinate system of the imager to the coordinate system of the imaging camera source based on the first and second off-line calibrations and information from the first and second sensors and a transmitter positioned with respect to an object being imaged.

The embodiment of the invention discloses a pose determining method and device and a storage medium, and belongs to the technical field of computers. The method comprises: based on the homography matrix of a marker image relative to a specified coordinate system, tracking the feature points of the marker image and acquiring the homography matrix of a specified image relative to the specified coordinate system; and decomposing the homography matrixes according to a constraint condition and a depth hypothesis condition to obtain a rotational displacement matrix of the specified image relative tothe marker image; and acquiring the pose parameters of the specified image relative to the marker image from the rotational displacement matrix. When the homography matrixes are decomposed, the influence of the depths of the feature points on a tracking process is taken into consideration, and the pose parameters of the specified image relative to the marker image are obtained under the same depth of the feature points on the horizontal plane of the specified coordinate system, thereby determining the position and the attitude of a camera and improving the tracking accuracy of the camera. Noerror is introduced even when switching the marker images.

The invention relates to a solar tracking and driving control system comprising a receiver, a protection plate, at least three thermocouple temperature sensors, a central control unit, an elevating-angle angular sensor, an azimuth-angle angular sensor, an azimuth-angle driving mechanism, an elevating-angle driving mechanism, a GPS (Global Positioning System) module, a power supply, an azimuth-angle worm and gear transmission mechanism and an elevating-angle worm and gear transmission mechanism. The azimuth-angle driving mechanism drives the azimuth-angle worm and gear transmission mechanism, the elevating-angle driving mechanism drives the elevating-angle worm and gear transmission mechanism; the azimuth-angle driving mechanism is provided with at least two first motors; the azimuth-angle driving mechanism is provided with at least two second motors; the thermocouple temperature sensors are distributed on the protection plate, circularly distributed in at least one circle centering about a receiving hole of the receiver, and each circle is provided with at least three thermocouple temperature sensors. The invention has the advantages of high tracing reaction speed, high tracking accuracy, low cost, stable driving part operation, strong anti-impact capability, great transmission torque and long service life.

The embodiment of the invention relates to a power-supply apparatus and control method, a power amplifying device. The device includes a includes linear branch and a first switch power supply group, the first switch power supply group includes a first current detector and at least two switch power supply branches, the switch power supply branch includes a hysteresis controller and a switch power supply drive and power circuit, the input end of the first electrical current detector is connected with the output end of the linear power supply branch, the input end of the hysteresis controller is connected with the output end of the first electrical current detector, the input end of the switch power supply drive and power circuit is connected with the output end of the hysteresis controller, the output end thereof is in parallel connection with the output end of the linear power supply branch. The embodiment of the invention can improve the band width and the tracking accuracy of the switch power supply, further improve the integral efficiency of the ET power amplifier.

The invention provides a neural network adaptive control method applied to a servo system in order to improve the control accuracy of the servo system, which realizes nonlinear compensation and interference suppression of the servo system and improves the tracking accuracy and the robustness of the servo system. In addition, a speed closed loop is not needed, so the entire system can be quite conveniently designed, is easy to implement in engineering and reduces the cost.

A computer program causes an object tracking device to realize functions of: acquiring a first image of a scene including an object captured with a camera positioned at a first position; deriving a 3D pose of the object in a second image captured with the camera positioned at a second position using a 3D model corresponding to the object; deriving 3D scene feature points of the scene based at least on the first image and the second image; obtaining a 3D-2D relationship between 3D points represented in a 3D coordinate system of the 3D model and image feature points on the second image; and updating the derived pose using the 3D-2D relationship, wherein the 3D points include the 3D scene feature points and 3D model points on the 3D model.

The invention discloses an automatic focus tracking type solar concentrating photovoltaic power generation system, and belongs to the field of concentrating photovoltaics (CPV). The problems of accuracy, cooling and weather resistance bottlenecks of the conventional CPV are mainly solved, and power generation cost is lowered. The system consists of five systems: (A), for concentrating power generation, condensing mirrors are fixed, and solar cells are driven by a stepper motor to track sunlight converging focuses; (B), for control tracking, computer time is corrected by a timing system, the position of a sunlight converging focus at another coming moment is calculated according to the original positions, module parameters, directions and positions of two sunlight converging focuses, which are manually measured at a certain time interval, and an instruction is transmitted to the stepper motor to drive the solar cells to move to the position at the moment; (C), for cooling and heat production, the solar cells are directly impregnated by a circulating liquid heat conducting medium; (D), for charging and discharging inversion, running power is stored at first, and redundant power is transmitted to a power grid; and (E), for automatic cleaning, an automatic spraying and rain wiping mode is adopted.

The present invention provides a multi-target tracking method after through-wall radar imaging, the rapid imaging can be achieved in a certain error, and a high quality imaging result can be obtained. According to the target targeting algorithm based on two-dimensional low-pass filtering and image etching, measurement position information and amplitude information can be effectively extracted, and finally a nearest area data association algorithm is used to carry out target tracking. At the same time, according to an interacting multiple model tracking algorithm, the high mobility of the target is fully considered, and the target tracking accuracy is high.

The invention discloses a pseudo-measurement-based asynchronous track fusion algorithm with a feedback maneuvering target. Firstly, input interaction is carried out on a model set, and the filtering initial value of each model is calculated according to the model probability and the model transfer probability; secondly, a fusion center calculates one-step prediction values on the basis of the Kalman filtering algorithm, after new sensor measurement information in the filtering period is obtained, the one-step prediction values are distributed in a time shaft sequence, recurrence is conducted on a fusion moment, information such as sensor observation matrixes, noise and model prediction are added, and asynchronous track fusion is conducted; thirdly, secondary filtering is carried out for calculating model output, output interaction is performed in the fusion center to obtain a fusion center estimated value and an estimation error matrix, and the fusion center estimated value and the estimation error matrix are fed back to a sensor according with feedback conditions. The overall precision of the algorithm is improved by introducing a fusion structure with feedback so that a better effect can be achieved in multi-sensor maneuvering target tracking.

The invention provides a TMX320F28335 floating point DSP (Digital Signal Processor) based two-shaft photoelectric tracking system, belongs to the technical field of control of servo movement, and aims at solving the problems of low tracking precision and inconvenient mounting, dismounting and repairing due to the DSP based control for the two-shaft photoelectric tracking system in the prior art. The system comprises a detection device, a servo control module, an angle measuring loop module, a speed measuring loop module, a power amplification driving loop module, a communication loop module, an upper computer module and an image processing module; the angle position information and angle rate information measured by a photoelectric encoder and a gyro of the detection device are respectively sent to the servo control module through the angle measuring loop module and the speed measuring loop module; the image processing module is used for processing the acquired module to obtain the miss distance of a characteristics target; the servo control module is used for acquiring control quantity according to the angle position information, the angle rate information, the miss distance, an instruction of an upper computer and a set working mode and sending to the power amplification driving loop module to drive the detection device to track the characteristics target on real time. The system is applied to the field of military tracking.

The invention relates to a neural network compensation control method for capturing maximum wind energy in a wind power system. The neural network compensation control method includes a, acquiring the speed of the wind, and acquiring a reference value of the speed of a wind turbine and a corresponding disturbance speed of the wind turbine according to the wind speed, a reference value of a tip speed ratio and a gear ratio of a gear box; b, acquiring a speed error according to the reference value of the speed of the wind turbine and a speed value of the wind turbine, adopting the PID closed-loop regulation on the reference value of the speed of the wind turbine and the speed error, and acquiring a reference value of the steady torque of the wind turbine; c, adopting the reference value of the steady torque of the wind turbine and the disturbance speed of the wind turbine as the input of the the BP neural network, adopting the PSO (particle swarm optimization)algorithm to train until a required torque control value of the wind turbine is outputted, and accordingly controlling the torque of the wind torque through the torque control value of the wind turbine. By the aid of the neural network compensation control method, effective control of the torque of the wind turbine is realized, cost is reduced, adapting range is wide, and the neural network compensation control method is safe and reliable.

A satellite laser distance measurement system based on tilt calibration is featured as setting high speed tilt reflector in telescoping unit, using tilt tracking transducer to carry out wave front detection on light wave received by receiving telescope, outputting calibration control signal to high speed tilt mirror in telescope by high speed processor after error signal is restored, starting up satellite laser distance measurement system in telescoping unit to send out laser with specific wavelength for carrying out satellite laser distance measurement after tilt closed loop real time calibration is finished.

The invention discloses a following system based on UWB, comprising the following parts: a first UWB transmitting and receiving module, disposed on a target object followed and provided with a UWB tag; a second UWB transmitting and receiving module and a third UWB transmitting and receiving module, horizontally arranged on the following object at intervals, wherein the UWB tag obtains the distances L2 and L3 from the first UWB transmitting and receiving module; a calculating unit, configured to obtain the distances L2 and L3 from the first UWB transmitting and receiving module according to theUWB tag, and calculate to obtain the distance and angle between the followed object and the first UWB transmitting and receiving module; and a control unit, configured to control the driving device disposed on the followed object so that the followed object faces the target object. The following system based on UWB realizes the measurement of the distance and angle of the target object through three UWB transmitting and receiving modules, has simple and efficient algorithm, reliable measurement and high following accuracy compared with the existing positioning following scheme (based on UWB,WiFi, Bluetooth, zigbee module, etc.), and in addition, reduces the cost and has good user experience.

The invention discloses an auxiliary method for tracking suspicious people by a monitoring system. The method comprises the following steps of: configuring the attribute of a monitoring point, modeling a monitored picture and switching the monitored picture. An auxiliary function for continuously tracking a plurality of points in a building is realized; space information and a video monitoring system are combined, so that the video monitoring system can be quickly switched to the monitored picture of a monitoring point at which a suspicious personnel is positioned through simple visible operation; the tracking speed is high; the tracking precision is high; and the implementation method is simple.

The invention discloses an improved maximum power point tracking method for a photovoltaic power generation system. The improved maximum power point tracking method comprises a Boost circuit, a voltage and current sampling circuit, an IR2110 isolation driving circuit and a digital signal processor DSP, wherein the digital signal processor DSP is connected with the voltage and current sampling circuit and the IR2110 isolation driving circuit; the IR2110 isolation driving circuit is connected with a power switch tube Q of the Boost circuit; the digital signal processor DSP controls the duty cycle adjustment of the power switch tube according to voltage U (k) and current I (k) which are acquired in real time to enable the output of a photovoltaic cell to reach the maximum power point. According to the improved maximum power point tracking method, in the beginning, the constant voltage tracking (CVT) method is adopted to quickly track to be close to the maximum power point of the photovoltaic power generation system, and then the modified variable step-size incremental conductance method is switched to further track to the maximum power point, so that quick tracking and high-precision operation are realized, and shortcomings in conventional algorithms at present are overcome.

The invention provides a 16 quadrature amplitude modulation (QAM) demodulation synchronization method. The method comprises a first step of adding a power detection technology on a traditional costas loop of quadrature phase shift keying (QPSK) so as to finish carrier recovery; a second step of performing matched filtering on each same-phase orthogonal component signal, so as to reduce noise effect and prepare for bit synchronization; a third step of performing bit timing recovery on same-phase orthogonal signals through an "early-late gate"; a fourth step of setting a threshold, and performing sampling judgment and 4-2 level conversion on each of two paths of signal to obtain parallel signals; and a fifth step of performing differential decoding and parallel-serial conversion on the parallel signals, then recovering and obtaining original signals. According to the introduced novel carrier synchronization technology, the carrier recovery is finished by using a phase-locked loop; on the basis of the traditional costas loop, the power detection technology is added, so that the linear output of a phase discriminator is guaranteed, the tracking precision and speed are improved, and the novel carrier synchronization technology passes field programmable gate array (FPGA) hardware verification.

The invention provides a sunlight tracking sensor at least comprising a light signal detector fixed on a photovoltaic component and facing to the same direction with the photovoltaic component. The light signal detector comprises multi-quadrant light sensors and a controller. Each multi-quadrant light sensor comprises a signal output end corresponding to each quadrant and a shielding structure. The multi-quadrant light sensors are partitioned according to each quadrant. The controller is connected to the light signal detector and a motor device, and is used for receiving and processing electrical signals outputted by each output end of the light signal detector. Sunlight tracking by the photovoltaic component is realized by the motor device controlled according to correspondence of current values of the light sensor. The sunlight tracking sensor is low in cost, simple in structure, high in tracking accuracy, more sensitive to light with a small incident angle, and large in accurate tracking range, and can be applied in the field of sunlight tracking on a large scale.

The invention discloses a power supply modulator and a power supply modulating method, comprising isolating power supplies, amplitude generating circuits and a controller, wherein the number of the isolating power supplies and the amplitude generating circuits are respectively N (N is more than 1); each isolating power supply is connected with one corresponding amplitude generating circuit; the output ends of all the amplitude generating circuits are connected in series; the controller is respectively connected with the amplitude generating circuits, wherein the isolating power supplies output reference power supplying signals to the amplitude generating circuits; the controller receives the reference signals to be tracked, determines the amplitudes of electric signals output by all the amplitude generating circuits according to the amplitudes of the reference signals to be tracked, and sends control signals to all the amplitude generating circuits; and after receiving the control signals, the amplitude generating circuits adopt the reference power supplying signals to output the electric signals according to the control signals; and all the amplitude generating circuits output in series. The invention can realize the higher tracking accuracy of output signals by less input power supplies, and can simultaneously optimize the loss of devices.

The invention discloses a method and a device for a trough solar heat collector to automatically track solar trace. The method comprises the following steps of: arranging a fulcrum bushing on the trough solar heat collector, fixing the fulcrum bushing on a supporting shaft of a pedestal, arranging two crankshafts on the fulcrum bushing, controlling two hydraulic cylinders to push or pull the two crankshafts to rotate around the supporting shaft via a hydraulic control device through a solar trace sensor or a DPU controller, and adjusting postures of the trough solar heat collector. The invention adopts the solar trace sensor or the DPU controller to control a solar tracking system, so the trough solar heat collector can normally work in sunny days, can also normally work in cloudy days, and can automatically return to the initial state which begins to receive thermal energy of sunlight in the morning at night. The method and the device have the advantages of good universality, high tracking accuracy, good condensation, and high heat collection efficiency.