126 results about "Measurement finding" patented technology

In a computerized system including a camera mounted in a moving vehicle. The camera acquires consecutively in real time image frames including images of an object within the field of view of the camera. Range to the object from the moving vehicle is determined in real time. A dimension, e.g. a width, is measured in the respective images of two or more image frames, thereby producing measurements of the dimension. The measurements are processed to produce a smoothed measurement of the dimension. The dimension is measured subsequently in one or more subsequent frames. The range from the vehicle to the object is calculated in real time based on the smoothed measurement and the subsequent measurements. The processing preferably includes calculating recursively the smoothed dimension using a Kalman filter.

A sensor obtains transverse sensitivity in a sensitivity matrix of an acceleration sensor with a uniaxial vibration generator. The acceleration is measured by vibrating the table 12. As the measurement of the main axis sensitivity, transverse sensitivity Szx associated with the X-axis is obtained from measured results of the acceleration sensor 5 and measured results of a measuring instrument for measuring the surface motion of the table 12 independently. Likewise, transverse sensitivity Szy associated with the Y-axis is obtained by fixing on the table 12 the cubical block on which the acceleration sensor 5 is mounted in such a manner that the Y-axis direction defined with respect to the acceleration sensor 5 aligns with the vibration direction of the table 12.

The invention discloses a dynamic measuring device and method for plumb line deviation kept on the basis of an astronomical attitude reference. An INS / GPS attitude measurement subsystem and an LGU / GPS attitude measurement subsystem are built, wherein an initial value adopted for attitude updating by the LGU / GPS attitude measurement subsystem is provided by attitude information output by a star sensor. The difference between the attitude output by the LGU / GPS attitude measurement subsystem and the attitude output by the INS / GPS attitude measurement subsystem is obtained, and further the plumb line deviation is calculated. Finally, jump errors in the measuring values of the plumb line deviation are finally corrected, and low frequency errors in the measuring values of the plumb line deviation are corrected by utilizing global gravity model data. The systems in the invention are simple; the method provided by the invention is strong in robustness, and the measuring results are stable; requirements to GPS accuracy are lowered; compared with a traditional vector airborne gravitometer which relies on high precision difference GPS, the dynamic measuring device provided by the invention only requires common GPS single point positioning to meet accuracy requirements. Therefore, the application scope of the measuring method is expanded.

The invention discloses a method for the calibration of vectorial coordinate transformation and the modification of errors of a digital image probe, and a device thereof; the noncontact optical measurement principle is adopted to realize the precise calibration and accurate modification of errors of the image probe in high-accurate two-dimensional measurement and ensure an accurate measurement result. The method of calibration is realized completely on the basis of the measuring principle of the image probe, without the existence of the errors of calibration principle. The process of calibration is based on the self-calibration principle, a virtual calibration point is formed by fixing a target object and moving the probe, then the calibration operation is fulfilled by constructing a vector, therefore, the operability of equipment is improved; by calculating the position of the image optical centre of an probe image sensor to be taken as the calibration origin, a new measurement error caused by the offset of a coordinate system is avoided to be introduced after the multiplying power of the probe is adjusted, the requirements of measurement in different application situations are ensured, and as the probe self-calibration technology is adopted, the calibration of the probe is ensured to have very high accuracy; the error self-modification is realized by moving a precise three-dimensional moving mechanical device to extract error meshes.

An ellipsometer measures any point of a sample by a first spectrometer and a second spectrometer. The ellipsometer performs analysis based on the measurement results obtained by the first spectrometer, performs analysis based on the measurement results obtained by the second spectrometer, and calculates an approximation formula for approximating the analysis results obtained by the second spectrometer to the analysis results obtained by the first spectrometer. The remaining points of the sample are measured with the second spectrometer, and the results of analysis using the measurement results are corrected based on the approximation formula.

The embodiment of the invention discloses method, device and system for reporting measuring results, relating to the communication field and solving the problems that the prior art employs information of adjacent cells to mark measuring results in a measurement report and occupies overmuch bit resource resulting in less measuring results reported in the measurement report. The embodiment of the invention has the technical scheme of determining the marking information of a measuring result to be reported according to the mapping relation between the information of adjacent cells and the marking information for marking the adjacent cells; marking the measuring result with the marking information to generate a measurement report; and reporting the measurement report to a network.

A measuring endoscope apparatus includes: an endoscope that performs photoelectric conversion of a subject image to generate an imaging signal; an imaging signal processing unit that processes the imaging signal to generate image data; a measurement unit that executes measurement based on a principle of triangulation using the image data; a display signal generating unit that generates a display signal for displaying a measurement result; a determination unit that determines the reliability of the measurement result on the basis of the image data; and a control unit that executes a control according to a determination result.

The invention discloses a method for assessing measurement uncertainty of a coordinate measuring machine. The method of avoiding the complex relation among error sources of the coronate measuring machine and unknown transmission rules between the error sources is adopted, the method of analyzing characteristic indexes of a measurement system of the coordinate measuring machine is adopted, the method and approach of verifying or obtaining corresponding system characteristic index values of the measurement system, an integral calibration method and a detail experiment scheme for obtaining a stability index and a reproducibility index of the coordinate measuring machine are designed, the influence degree of actual temperature in temperature compensation, a standard grating rule and a linear expansion coefficient of a tested workpiece on a measurement result is considered, and the relatively integral measurement uncertainty of the coordinate measuring machine is obtained through synthesis in the root of square sum.

This invention discloses a Doppler sea flow section flow speed test method, which comprises the following steps: first to pre-estimate the ship speed and flow speed vector and the valuation V#-[E] of V and to set first time interval T#-[1] between two sub-impulse according to the valuation; to get the pre-valuation V#-[S] of the ship speed and flow speed vector and V according to first time interval; to set second time interval T#-[2] according to pre-valuation V#-[S]; to choose the relative impulse emission code according to second time interval T#-[2] and to adopt relative impulse pair covariance method to test flow speed to get the ship speed and flow speed vector and V accurate value V#-[P]; final to get flow speed by minus the ship speed from the measurement results.

A digital signal processing circuit measures a distance according to a plurality of modulation frequencies including a first modulation frequency and a second modulation frequency lower than the first modulation frequency. The digital signal processing circuit is configured such that, when measuring the distance at the first modulation frequency, a storage capacitance of a light receiving element 6 stores or discharges electric charges according to the timing when the polarity of a phase is controlled by a light emission control unit at each transmission of a sub sequence and the distance is measured according to the electric charges stored in the storage capacitance. The digital signal processing circuit corrects the distance measurement result based on the measurement result at the first modulation frequency and the measurement result at the second modulation frequency.

The invention discloses a composite measurement system and measurement method of laser line scanning and shadow Moire measurement. The method comprises steps of using the phase laser line scanning technology to carry out primary coarse measurement on a to-be-measured object; using the shadow Moire topography to carry out primary fine measurement on the to-be-measured object; and using the measurement result of the coarse measurement to assist phase unwrapping of fine measurement, thereby achieving accurate measurement of steps. A light source of a measurement device is a laser microvibration mirror projector, so quick laser line scanning can be achieved and overall uniform lighting can be provided for shadow Moire measurement. All the measurement is finished in one system, and the to-be-measured object does not need to move during the measurement, so measurement precision and measurement speed are ensured.

The present invention provides a measurement apparatus for measuring a shape of an object to be measured, comprising a measuring head configured to perform measurement in a first measurement mode and perform measurement in a second measurement mode having measurement accuracy higher than that of the first measurement mode, a detection unit configured to detect an occupancy region of the object to be measured, and a control unit configured to control the measuring head, wherein in the first measurement mode, the control unit moves, based on a detection result of the detection unit, the measuring head not to touch the object to be measured, and in the second measurement mode, the control unit moves, based on a measurement result in the first measurement mode, the measuring head to satisfy an allowable condition in the second measurement mode.

The invention discloses a part height measuring method based on laser ranging. The part height measuring method based on the laser ranging comprises the steps of (1) measuring distances between all points to be measured and a laser range finder point by point through the laser range finder at constant speed along measuring tracks, (2) transmitting measuring results of all points to be measured on the measuring tracks and measuring time which is time from displacement of the laser range finer to the points to be measured to a storage unit through the laser range finder at the same time of the step of (1), (3) sending received data to an analysis unit through the storage unit when measurement of the laser range finder is finished, (4) calculating height reference values of the points to be measured through the analysis unit according to sent data of the storage unit and combination of the measuring tracks and positions of the points to be measured and sending out. According to the part height measuring method based on the laser ranging, confirming time of the positions of the points to be measured and start-stop time of the laser range finder in the points to be measured are saved in the measuring process, measuring time is saved, and therefore the part height measuring method based on the laser ranging is especially suitable for height measurement of mass products with the same standard.

The embodiment of the invention discloses an online re-measurement method for the specified length of a slab, which comprises the steps that a corresponding relation between the pixel position of a roller way and the actual position of the roller way is established; a slab head part and a slab tail part are recognized through a camera, and pixel position of the slab head part and the slab tail part in a shot image are determined; actual positions of the slab head part and the slab tail part on the roller way are determined according to the pixel positions of the slab head part and the slab tail part in the shot image and the corresponding relation; the length of the slab is calculated according to the actual positions of the slab head part and the slab tail part on the roller way, and an actual cutting position of a cutting machine for cutting the slab is calculated; and the cutting machine is controlled to move to the actual cutting position so as to cut the slab. The online re-measurement method disclosed by the invention for the specified length of the slab overcomes problems of high labor force and low accuracy of manual measurement, and effectively solves a problem that guidance and correction of a measurement result for primary cutting are inaccurate.

The invention is directed to a method for detecting and documenting the speeds of a plurality of vehicles in an image document. The plurality of vehicles drive simultaneously through the measurement zone of a radiation-based, multitarget-capable measuring arrangement. Vehicle-specific measurement data are acquired from the measurement results, and measurement data sets are formed from these vehicle-specific measurement data and stored. One of the vehicles driving at a speed above a limiting value causes a camera to be triggered. An image document in which a speed is displayed so as to be assigned to the imaged vehicles is generated from the image data acquired by the camera and from the last stored measurement data set.

The invention relates to a fast three-dimensional point cloud searching and matching method, which comprises the steps of main shaft registration, measuring shaft generation, low-precision searching, high-precision searching and primary iteration result generation. The main shaft registration link is responsible for the defining point cloud direction and completes the initial registration, the measuring shaft generation link provides the searching range in the current iteration for moving point clouds, the low-precision searching adopts an ergodic method for looking for the optimal registration posture of the moving point clouds on the current measuring shaft, the high-precision searching is responsible for obtaining better optimal registration posture at smaller step length searching position errors on the basis of the low-precision searching, and the primary iteration result generation link is responsible for generating the final results of the primary iteration according to the measuring results in each position. The invention starts from the geometrical shape of the point clouds, and completes the ergodic searching at different precisions through the mutual movement and rotation between two point clouds to find the optimal matching position, the algorithm has good fault-tolerance performance, and the invention is suitable for any three-dimensional digital instrument to obtain the searching matching of the three-dimensional point clouds.

A measurement system is capable of accurately aligning the corresponding measurement points of a plurality of measurement targets to evaluate the measurement targets from measurement results. A measurement system includes a measuring instrument and a PC, the measuring instrument includes a spectroscopic unit that measures a measurement point of a measurement target and a camera that images surroundings in real-time. The PC displays an evaluation image of continuous image information, which is imaged and displayed by the camera on a display screen so as to be superimposed on a reference image of still image information, which has been imaged and stored in memory. By comparing the data obtained by measuring the measurement point in the evaluation image when both images overlap each other and the measurement data of the point in the reference image, it is possible to perform positioning easily and compare the measurement data.

A method and a system for monitoring the functional capability of a particle detector connected downstream, in the flow direction, of a particle filter, in which particles occurring upon the regeneration of the particle filter, in particular ions, are detected by the particle detector and the resultant measurement finding are compared with an expected finding. The measurement and evaluation are effected in a control and evaluation unit. The invention enables monitoring of the functional capability of a particle detector that does not interrupt normal operation and thus increases the reliability of the entire system.

This invention relates to one velocity of flow measurement device and method, which in detail relates to one two-phase sensor real time measurement device and method, wherein the device comprises upper and down capacitor sensor circuit; one front channel circuit; upper and down ultraviolet circuit; two front channel circuit; digital display circuit and power circuit. The system is located with central process circuit for relative computing.

The invention discloses a spatial distance laser measuring device with a combined sensor. The spatial distance laser measuring device comprises laser distance measuring equipment used for transmitting and receiving laser; one end surface of the laser distance measuring equipment is provided with a laser transmitting port and a laser receiving port; the laser distance measuring equipment can rotate around a fixed reference point, so that laser transmitting and receiving directions can be adjusted; and the laser distance measuring equipment is provided with the combined position sensor for measuring the movement distance and angle of the laser distance measuring equipment. The spatial distance laser measuring device of the invention does not need to find right-angled edges when performing indirect spatial distance measurement, and therefore, measurement is more convenient, and at the same time, the influence of the accuracy of the right-angled edges, on measurement results, can be eliminated, and therefore, the accuracy of the measurement results can be improved.

The invention discloses a system and method for measuring a deflection angle error of a laser radar. The system comprises a planar motion platform, a laser radar bearing platform, an image acquisitiondevice and an upper computer, wherein the planar motion platform is used for driving the image acquisition device to move on a track plane; the laser radar bearing platform is used for bearing a laser radar to be measured and calibrating the position of the laser radar to be measured; the image acquisition device comprises a CCD camera and a frosted lens; a laser beam emitted by the laser radar to be measured forms a light spot on the first surface of the frosted lens, and the CCD camera is used for acquiring an image of the light spot; and the upper computer is connected with the planar motion platform, the laser radar bearing platform and the image acquisition device. According to the technical scheme provided by the embodiment of the invention, a phenomenon that damage is caused by direct incidence of a high-energy laser beam into a measuring device is avoided, the improvement of the precision of a measurement result is facilitated, and the measurement process of the deflection angle error is simple and easy to realize.

The invention discloses an adaptive-filtering-based rapid multi-circle detection method for an image under a complex background, and belongs to the technical field of computer vision online detection. The Sage-Husa adaptive kalman filtering algorithm is adopted for estimating the center coordinate and radius of each circle feature so as to estimate feature valid areas; in the feature valid area of each circle, after local enhancement of the image, the Canny edge detection algorithm and the least-squares ellipse fitting method are adopted for solving the center coordinate and radius of the circle feature; whether a positioning result is valid is judged according to a result validity criterion; if yes, a feature extraction value is output as a detection result; if not, a feature parameter estimation value is output as a detection result. Time-consuming Hough transformation is thoroughly abandoned in the multi-circle positioning process under the complex background, whether the positioning result is valid is judged before the measuring result is output, different measures are taken for different judgment results, the circle detection speed is substantially increased while precision is guaranteed, and the online monitoring requirement of an industrial monitoring system with a high-definition image sensor can be met.

The invention provides a method and device for automatically measuring crop canopy uniformity, and relates to the technical field of agriculture information. The method comprises the first step of obtaining a crop canopy image, the second step of calculating three-dimensional point cloud data of the crop canopy image by utilizing the binocular image reconstruction technology, the third step of separating row direction point cloud data from the three-dimensional point cloud data, the fourth step of calculating basic data of the crop canopy uniformity according to the row direction point cloud data, and the fifth step of calculating an index of the crop canopy uniformity according to the basic data. The method and device for automatically measuring the crop canopy uniformity achieve the purposes of continuously and automatically obtaining the index of the crop canopy uniformity, and are capable of automatically and continuously measuring the crop canopy uniformity in a lossless mode. Compared with a traditional method, the method has the advantages that human input is less needed, the automation degree is high, and the measurement result can comprehensively reflect the crop canopy uniformity and is not affected by a personal error or the experience of a measurement worker.

The invention discloses a method for estimating and compensating the bistatic scattering influence on a polarimetric calibration dihedral reflector. The method comprises the following steps: through analysis on the scattering mechanism of the dihedral reflector, estimating the influence of a bistatic scattering condition on the scattering field of the dihedral reflector; according to an estimation formula, compensating the bistatic scattering influence on a measurement result of the dihedral reflector so as to improve the subsequent polarimetric calibration precision. The method is extremely high in practicality; by the method, the bistatic scattering influence on the dihedral reflector rotating around a radar sightline for different angles can be estimated; by the method, the influence of the bistatic scattering on scattering characteristic measurement of the dihedral reflector is successfully estimated and compensated, so that the polarimetric calibration precision is improved.

A method for determining a state of credibility of measurements of an incidence sensor of an aircraft is provided. This method includes at least one coherence test between incidence measurements from said incidence sensor, and the measurements of a flight characteristic of the aircraft, distinct from the incidence. The coherence test includes determining an incidence value from said incidence sensor, determining said flight characteristic of the aircraft, determining a value of at least one indicator of the coherence of the incidence value with the value of said flight characteristic, and activating a low state of credibility, in which the measurements of said incidence sensor are deemed unreliable, or an intermediate state of credibility, in which the measurements from said incidence sensor are deemed coherent with said flight characteristic, based on the value of said coherence indicator.

The invention aims at providing a specific absorbed rate measurement device which can measure the specific absorbed rate (SAR) that is used for evaluating the absorbed power by human bodies when a mobile phone is used near the human bodies. The specific absorbed rate measurement device of the invention includes: a probe, which measures the amplitude and the phase of two-dimensional electric field or magnetic field in a human model that simulates the electric constants of a human body; an electric field estimation unit which estimates the three-dimensional distribution of the electric field that takes the two-dimensional electric field and the magnetic field of a measured point as the wave source radiation according to the measuring result of the probe; a specific absorbed rate estimation unit which estimates the three-dimensional specific absorbed rate according to the estimated result of the electric field estimation unit.

A counting device includes a counting unit, period measuring unit, frequency distribution generating unit, representative value calculation unit, and correction value calculation unit. The counting unit counts the number of signals input during a counting interval. The number of signals has a linear relationship with a physical quantity. The signals have a substantially single frequency when the physical quantity is constant. The period measuring unit measures the period of a signal every time a signal is input during the counting interval. The frequency distribution generating unit generates the frequency distribution of signal periods from the measurement result. The representative value calculation unit calculates the representative value of the distribution of periods of signals from the frequency distribution. The correction value calculation unit obtains a total sum Ns of frequencies in a class not more than a first predetermined multiple of the representative value calculated and a total sum Nw of frequencies in a class not less than a second predetermined multiple of the representative value from the frequency distribution, and corrects the count result on the basis of the frequencies Ns and Nw.