266results about How to "Guaranteed Calibration Accuracy" patented technology

The invention relates to a vector-relation-based method for calibrating single-line laser radar and a CCD camera. Point set information of the laser radar for scanning a V-shaped target is extracted in a laser coordinate system, and direction vectors and intersection coordinates of straight lines in two different planes of the target are obtained by means of straight line fitting; the CCD camera is used for capturing images in a camera coordinate system, target plane equations and an equation of a plane passing through an original point and laser radar scanning lines are obtained by processing image information, a straight-line equation of laser radar scanning is built, and furthermore, the direction vectors and the intersection coordinates of the straight lines are obtained; finally, calibration is finished according to the relations between direction vectors and the intersection coordinates of the straight lines corresponding to the different coordinate systems. According to the method, no object in a calibration scene needs to be moved, collection of all calibration data can be completed at a time, and calibration efficiency is improved greatly. According to the method, the direction vectors of the straight lines of the laser scanning target planes under the coordinate systems of sensors to be calibrated are obtained directly, calibration precision is guaranteed, and meanwhile the calibration algorithm is simplified.

The invention provides a calibration method of pose position-free constraint line laser monocular vision three-dimensional measurement sensor parameters and belongs to the technical fields of optical measurement and mechanical engineering technologies. After basic data are extracted, imaging points are sequenced according to the invariance of a vector quantity cross product direction set composed of the imaging points of target feature points in any shooting pose position, and corresponding relation between the target feature points and the imaging points is built. Light plane feature points are extracted through quadrilateral intersection composed of a light knife central point set fitting straight lines and the target feature points, and a three-dimensional coordinate is calculated according to an intersection invariance principle. Inner and outer diameters in a monocular vidicon and light plane diameters of a line laser projector are optically fitted and calculated, and accurate calibration of the line laser monocular vision three-dimensional measurement sensor parameters is achieved. In calibration, a target can freely move and rotate completely, pose position placing is free of restraint, the same group of calibration images is shared for calibration of two parts of diameters, the calibration accuracy of a three-dimensional measurement sensor is ensured, and simultaneously calibration steps are simplified.

A static state calibration device and method for machine visual surface detection equipment belongs to the measuring field; the static state calibration device comprises a scale, a movable calibration module, an expandable scale, a laser emitter and an angle regulator; the static state calibration device can accurately position a light source and a camera imaging position; the calibration module can fast and accurately adjust a micro angle of a linear array camera so as to ensure imaging accuracy and consistency, is suitable for adjustment between one linear array camera and the light source, and suitable for adjustment between a plurality of cameras and the light source; the static state calibration device is suitable for lab equipment calibration, and suitable for field equipment calibration and adjustment; the static state calibration device can directly check acquisition image effect so as to ensure whether the camera is adjusted to a best position or not, thereby improving system detection accuracy, and improving debug work efficiency; the static state calibration device can be widely applied in calibration or management field of one or more linear array cameras.

The invention discloses a fish-eye camera stereo vision depth measuring method based on a Taylor series model. Firstly, a fish-eye stereo vision camera is standardized according to the Taylor series model to obtain a mapping relation from a three-dimensional space point to a two-dimensional image point and a position relation between a left fish-eye stereo camera and a right fish-eye stereo camera, namely, the in parameter and the out parameter of the fish-eye stereo vision camera. On that basis, spherical polar line is corrected, so that the same three-dimensional space point is located in the same line on the corrected left image and right image. Finally, a matching relation of corresponding points is obtained on the left image and the right image by stereo matching, and depth information of corresponding three-dimensional space point is calculated. The fish-eye camera stereo vision depth measuring method based on the Taylor series model has the following advantages: a modeling method based on the Taylor series can achieve higher modeling precision for the fish-eye camera, and based on a spherical polar line correction method, computational complexity can be effectively reduced on the condition of guaranteeing correction precision.

The present invention provides a flying needle test machine correction method. The flying needle test machine comprises a first test shaft, a second test shaft, a third test shaft and a fourth test shaft. Each test shaft is provided with one probe and one CCD camera corresponding to the probe, and the offset between the point of each probe and the center of each corresponding CCD camera and the total stroke between the probe at the right side and the probe at the inverse side in the X direction are calculated according to the correction method. According to the correction method, the offset between the point of each probe and the center of each corresponding CCD camera and the total stroke between the probe at the right side and the probe at the inverse side in the X direction are calculated are rapidly and accurately obtained. The flying needle test machine correction method employs simple and effective steps and realizes the rapid needle correction of test shafts in the condition of ensuring the correction precision of the needle.

The invention discloses a sensor scaling method for measuring angles of mechanical arm and mechanical hand, comprising the steps of: pre-storing data lists between the mechanical arm and mechanical hand driving mechanism length, between angle of the mechanical arm and angle of the mechanical hand; searching for the data lists by acquiring a measurement value of the sensor to be scaled on the mechanical arm and mechanical hand driving mechanism length, and acquiring theoretical values of the angles of mechanical arm and mechanical hand corresponding to the measurement value of the sensor to be scaled on the mechanical arm and mechanical hand driving mechanism length, as scaled reference values of the sensor to be scaled; comparing and analyzing the measurement value of the sensor to be scaled and the scaled reference values, and scaling the sensor to be scaled. The invention, with no limitation of own installation means of the sensor, can accurately scale when the mechanical arm or mechanical hand is in any status. On this basis, the invention also discloses a sensor scaling device for measuring angles of mechanical arm and mechanical hand.

The invention relates to the technical field of hot milling, particularly to a calibration method and device of the centering precision of side guide plates of a finishing mill. The method comprises the following steps: measuring a distance A between the inner side of a first guide plate and the inner side of a first memorial arch; measuring a distance B between the inner side of a second guide plate and the inner side of a second memorial arch; calculating the value of A-B; and calibrating the opening value for the first guide plate, and the opening value for the second guide plate. The device comprises first distance measuring equipment, second distance measuring equipment and treating equipment, wherein the first distance measuring equipment is connected with the treating equipment; the second distance measuring equipment is connected with the treating equipment; the treating equipment is used for calculating the value of A- B, and calibrating the opening value for the first guide plate, and the opening value for the second guide plate. Through the adoption of the calibration method and device of the centering precision of the side guide plates of the finishing mill, provided by the invention, the accurate calibration of the first guide plate and the accurate calibration of the second guide plate are realized, so that the actual centering precision of the side guide plates meets site production requirements, and the stability of strip threading in finishing milling and tail throwing in finishing milling is improved; therefore, milling accidents are avoided.

The invention discloses a free attitude target calibrating system for landing of a helicopter. The free attitude target calibrating system comprises a target board and a host machine, the host machine is connected with a target calibrating instrument, a laser range finder and an inclinometer, the inclinometer is placed on a horizontal platform of the helicopter, a sensor of the inclinometer is fixed inside the helicopter, the host machine connected on a socket is measured by aerial insertion to the state of the host machine, a CCD (charge coupled device) camera of the target calibrating instrument and a calibrating mirror are integrally connected via a flange and then connected on an insert rod and directly inserted in an outer hanging frame of the helicopter, videos of the CCD camera are output to the host machine via a connecting wire, the laser range finer is formed by an observing mirror and a laser transmitting and receiving machine which is directly inserted in the outer hanging frame of the helicopter, and the observing mirror is connected with a view window via a photovoltaic conversion circuit, so that measured numerical values can be directly read via the view window. The free attitude target calibrating system is high in efficiency, fast in speed, convenient and simple to operate, and applicable to motorized and quick calibration of free attitude target of the helicopter.

Provided is a reticle increment calibration method for a laser galvanometer system. A reticle increment scanning and optical sensor measurement analysis method is adopted, a traditional calibration target is not needed, only an automated measuring device simple in structure is needed, under the circumstance that calibration precision is guaranteed, influences of human factors are effectively reduced, and workloads are reduced; meanwhile, the method can be well applied to calibrating large-size planes.

The invention proposes a car back-view check method based on a CATIA (computer-graphics aided three-dimensional interactive application). The car back-view check method comprises the following steps of: constructing a standard check module structure tree; constructing a car environment model; generating view ranges of regulatory requirements; constructing an obstacle model; projecting the obstacle model on a mirror surface of the car environment model, and adjusting a mirror surface drive parameter until the back-view check result meets the regulatory requirements. According to the car back-view check method, car back-view check efficiency under different regulatory requirements is improved.

The invention discloses an amplitude phase error self-correcting method applicable to a uniform circular array acoustic susceptance system and belongs to the technical field of signal processing in the acoustic susceptance system. Firstly, a uniform circular array is converted into a virtual line array through a mode-space conversion theory; then, direction-of-arrival estimation is carried out on the uniform circular array converted into the virtual line array through a TSI algorithm, and an azimuth angle of a correction source is determined; then the amplitude phase error parameter of the uniform circular array is estimated through a spatial filter. The azimuth angle of the correction source is estimated by the adoption of the TSI algorithm under the condition that the position of the correction source is unknown, higher azimuth angle estimation precision is achieved, and then higher amplitude phase error estimation precision is achieved.

The invention provides a high-accuracy current comparator and a self-checking method and belongs to the field of alternating current precision measurement. The high-accuracy current comparator comprises an iron core, a primary winding W11, a primary compensation grounding winding W12, a secondary winding W21, a secondary compensation winding W22 and a detection winding WD, wherein the primary winding W11, the primary compensation grounding winding W12, the secondary winding W21, the secondary compensation winding W22 and the detection winding WD are wound on the iron core. The primary winding has three groups of input terminals. The number of turns of the primary winding connected with the three groups of input terminals increases tenfold. The secondary winding is divided into M sections of sub-windings, wherein each section of sub-winding is provided with two taps and the number of turns of each section of sub-winding is the same with that of the primary winding La3-Lb. Each section of sub-winding of the secondary winding is connected in series through the tap. Two taps connected in series of the adjacent two sections of sub-windings form an end. All ends of the secondary winding is numbered sequentially from the first section, the number being from 0 to M. The number of sections of the secondary winding connected in the secondary winding input terminals is changed through a band switch.

The invention discloses a method for calibrating the spectral wavelength of an optical grating rotary light splitting spectrograph. The method is characterized in that a relation between the optical wavelength and reading of an optical encoder is derived by using an optical grating equation working under a Littrow condition, and a theoretical calibration model is established; spectral wavelength calibration is carried out by using a two-point equation solving method; and finally, initial wavelength positioning is carried out by using calibration parameters in order to ensure the consistency in target position when different spectrographs measure gratings with the same wavelength. The method disclosed by the invention has the advantages that (1) the calibration steps are simple and effective, and the calibration workload and the calculation amount are reduced under the premise of ensuring the calibration precision; (2) the calibration work can be completed by only using two standard light sources with different wavelengths under the premise of ensuring the accuracy of the wavelength, the calibration time is short, the calibration efficiency is high, and the calibration cost is low; and (3) the calibration model is established through known theories, curve fitting is not required to be adopted, factors, which influence calibration, among different spectrographs are considered comprehensively, calibration is carried out more reasonably and more feasibly, and the calibration precision is higher.

The invention discloses an inductive sensor calibration method and device for capacitive sensor displacement compensation, and belongs to the technical field of precision measurement. The calibration method and device take a dual-frequency laser interferometer as a motion reference, a linear motor as a macro motion drive element, a ball guide rail as a macro motion guide element and a linear grating as a macro motion feedback element for macro motion rough positioning; and adopt a voice coil motor as a micro motion drive element, an air-flotation guide rail as a micro motion guide element and the dual-frequency laser interferometer and a linear grating scale as micro motion feedback elements for micro motion fine positioning to compensate for a macro motion positioning error. Four capacitive sensors are used to compensate the pitch and yaw errors of a macro and micro positioning platform. According to the invention, the contradiction between the travel and the precision of the displacement sensor calibration device can be effectively solved, and the dynamic and static calibration of the large-travel and high-precision inductive displacement sensor is realized.

The invention relates to a high-current sensor calibration method based on a curve fitting method. The high-current sensor calibration method includes the steps of (1) appearance check, (2) electricity check, (2) voltage withstand testing, (4) insulation resistance check, (5) selection of a calibration point, (6) intrinsic error measurement and (7) relative error measurement. The high-current sensor calibration method is good in adaptability, a high-current source method or a calibration small resistance method can be adopted respectively for measurement and calibration according to relative errors, and the two methods are high in measurement and calibration precision. By means of the curve fitting method, a measurement result is obtained indirectly. The high-current sensor calibration method solves the problem that high-current sources are not sufficient when ultrahigh currents are measured, and guarantees measurement precision.

The invention relates to a method for calibrating external parameters of a distributed large-size space location system. According to the method, the difficult problems that the calibration process ofa large-size space location system is tedious, the overall optimization of the system is sensitive to primary external parameter values, the cost is high, and the like are solved. The method comprises the steps of carrying out primary calibration on the system by virtue of a two-dimensional calibration rod through supposing that a visual projection plane exists in front of an emitter, and carrying out overall calibration on the system by minimizing objective functions through Levenberg-Marquardt iterative optimization. The method has the beneficial effects that the operation process is simple, the calibration speed is high, the measurement accuracy and the working efficiency of the system are improved, and meanwhile, the system cost can be effectively lowered.

The invention discloses a camera calibration device based on a diffractive optical element, relates to the field of photogrammetry, and solves the problems of high cost and large space occupied by existing calibration devices. The device includes a laser, a spatial filter, a collimating lens, and a double-crossed one-dimensional DOE. The laser, the spatial filter, the collimating lens and the double-crossed one-dimensional DOE are sequentially arranged along the same axis, and a laser beam emitted from the laser is incident perpendicularly to the spatial filter, the collimating lens and the double-crossed one-dimensional DOE sequentially. The camera calibration device in the invention replaces the existing high-cost calibration module that occupies a large space through a diffraction starpoint network composed of N*N star points and obtained using the double-crossed one-dimensional DOE; simulates infinity imaging by using the collimating lens to comply with conditions of the use of anaerial survey camera; and at the same time does not limit the processing algorithm, that is, can guarantee the calibration accuracy. The camera calibration device can be widely used in the field of camera calibration.

The invention provides a transmitting power calibration method suitable for multiple frequency points and multiple power points, and the method comprises the steps: measuring the corresponding relation between the output power P of all frequency points and all power points supported by to-be-calibrated equipment and a quantized control voltage value V of a power amplifier, and obtaining corresponding P-V curve data; selecting a plurality of calibration frequency points according to calibration precision requirements; taking calibration curve data corresponding to each selected calibration frequency point as a reference calibration curve; and calibrating and configuring the maximum transmitting power of the to-be-calibrated equipment. The invention further provides a corresponding transmitting power calibration device. According to the invention, the calibration reference curve is used as a benchmark, and the compensated power curve obtained by calibration is used for finely adjusting the power, so that the calibration precision can be improved. Precision can be guaranteed through simple linear fitting with few points, calculation complexity is reduced, and therefore production linecalibration working hours are reduced, and working efficiency is improved.