66 results about "Rotation error" patented technology

The invention discloses a hand-eye calibration method suitable for a five-axis series-parallel mechanical arm, which comprises the following steps of: analyzing coordinate conversion error distribution characteristics according to an initial hand-eye calibration matrix calculation result, and separating a total error into two components, namely a translation error and a rotation error through an error vector decomposition algorithm, obtaining distribution rules and variation trends of the errors in different spatial directions; establishing a calibration precision evaluation system according to the verification result, calculating the repeated positioning precision and the absolute positioning precision of the system by counting and analyzing the position deviation data of multiple tests, and obtaining the system performance index in the current calibration state; a self-adaptive updating mechanism is established for system performance indexes, local updating of calibration parameters is automatically triggered when environment temperature change or small deformation of a mechanical structure is detected, and a compensation model is adjusted in an incremental learning mode to avoid comprehensive recalibration.

The invention discloses a method and a device for measuring orthogonality of an orthogonal rotary shaft system, and belongs to the technical field of orthogonal rotary shaft system detection. The orthogonal rotary shaft system comprises a first rotary shaft system and a second rotary shaft system; the method comprises the following steps: carrying out axis inclination angle rotation error measurement and attitude fine adjustment by using a CCD (Charge Coupled Device) double-axis autocollimator, and a cubic reference prism and a double-sided optical flat which are respectively fixed with a first rotation shaft system and a second rotation shaft system; setting a reference cross line XY through the double-sided optical flat by using a second rotary shaft system; the cross curve of the reflected light beam of the cubic reference prism is overlapped with the reference cross curve XY by adjusting the mounting positions of the two rotary shaft systems; and rotating the first rotating shaft system, recording an angular deviation value and calculating an orthogonality value of the two rotating shaft systems. According to the invention, the reference drift error of mutual aiming of the two autocollimators is eliminated, the interference of the rotation error of the shaft system on orthogonality measurement is eliminated, and the precision and reliability of the orthogonality measurement of the shaft system are improved on the whole.

The present invention relates to a circular profile error separation method based on the optimization of the indexing angle by time-frequency domain transformation, belonging to the technical field of ultra-precision geometric quantity measurement. The method includes the following steps: applying a single indexing to cause a certain time delay of the profile error signal of the measured part in the time domain, and using the additional information obtained by this indexing to separate the spindle rotation error and the profile error of the measured part. The present invention establishes the relationship between the separation accuracy and the indexing angle error through time-frequency domain transformation. Thus, parameter optimization is carried out according to the requirements of error separation, realizing the roundness error separation that takes into account both the error separation accuracy and the harmonic range that can be accurately separated, so as to obtain more comprehensive, real and accurate circular profile information, providing an accurate theoretical basis for the metrology institutions and key laboratories to implement high-precision measurement of the circular cross-section of rotary parts.

The invention discloses a spindle rotation error detection device and a detection calculation method, and belongs to the field of spindle error detection. The detection device comprises a base, an arc-shaped tool and an annular cover plate, wherein the arc-shaped tool comprises a buckle main shaft, and the annular cover plate is arranged on the inner periphery of the arc-shaped tool; the clamping part comprises an annular seat mounted at the top of the annular cover plate and a circular shell arranged on the inner periphery of the annular seat; the detection part is arranged in the circular shell and comprises a mounting seat mounted at the top end of the main shaft and a detection assembly arranged on the mounting seat; and the plurality of detectors respectively penetrate through the circular shell, are clamped and fixed on the circular shell, and are used for radially detecting distance data between the detectors and the detection assembly. According to the invention, the six degrees of freedom of the main shaft can be detected and the problems of overturning, end jumping, radial jitter and the like can be identified at the same time. The device has the advantages of high precision, high efficiency, dynamic continuity, complete error measurement and convenient installation.

The invention relates to the field of optical system calibration, in particular to an optical camera position and attitude calibration method. According to the method, a least square method is adopted, the flatness h of an imaging assembly installation reference surface and the perpendicularity p between the imaging assembly installation reference surface and an optical lens installation reference surface are subjected to least square fitting, the correction misalignment amount delta is obtained, reference is provided for follow-up coaxial adjustment of an optical lens of an optical camera and an imaging assembly, and the calibration precision is improved. By adopting the beam splitter prism assembly, auto-collimation images of the beam splitter prism assembly can be simultaneously incident to different directions of the accurate measurement mirror assembly by only using one laser theodolite; compared with a traditional measurement method adopting a plurality of laser theodolites, the method has the advantages that the rotation error caused by mutual aiming of the plurality of laser theodolites is overcome, and the calibration precision and efficiency are improved.

The invention provides a spindle radial rotation error separation method based on a multi-point method. The spindle radial rotation error separation method comprises the steps that firstly, displacement data of a spindle are collected through a first directional displacement sensor and a second directional displacement sensor; step 2, inputting displacement data into an error separation model, and outputting a forward rotation error and a backward rotation error; wherein the establishment of the error separation model comprises the following steps: (1) based on kinematics analysis of a main shaft, establishing measurement data of a main shaft radial rotation error test model to obtain a direction displacement error measurement model and a direction displacement error measurement model; and (2) eliminating a sensor installation offset error and a test rod roundness error based on an improved multi-point error separation method to obtain a pure spindle radial rotation error. According to the invention, on the basis of eliminating the offset error of sensor installation and the roundness error of the test detection rod in the measurement data, the pure spindle radial rotation error is obtained, and the high-precision measurement of the spindle radial rotation error is realized.

The invention discloses a multi-degree-of-freedom rotation error obtaining method and device, a medium and equipment, and relates to the technical field of precision measurement, and the method comprises the steps: installing a double-ball target on the end face of a rotary table, and obtaining a plurality of different rotation angle images when the double-ball target rotates along with the rotary table; detecting the plurality of images with different rotation angles, determining the three-dimensional coordinates of the sphere center positions of the plurality of double-sphere targets, averaging the three-dimensional coordinates of the sphere center positions of the plurality of double-sphere targets, and generating the motion trails of the sphere centers of the double-sphere targets; fitting the motion trail of the center of the double-ball target by adopting a least square circle method to obtain two base circle center coordinates of the motion trail on a two-dimensional plane, and obtaining a multi-degree-of-freedom rotation error of the rotary table according to the two base circle center coordinates; wherein the multi-degree-of-freedom rotation error comprises an axial rotation error, a radial rotation error and an inclined rotation error, and efficient measurement of the multi-degree-of-freedom rotation error is achieved.

The invention discloses a laser interferometer plane reflection mirror surface type error compensation method based on redundancy characteristics. The method comprises the following steps of: establishing a composite compensation model containing a rotating surface type error and a translation surface type error based on a redundant measurement characteristic of an X / Y-direction measurement light beam on an Rz degree of freedom; the rotating surface type error model is constructed through Rz degree-of-freedom redundant data of a measurement light beam, and the translation surface type error model is established based on a geometrical relationship between a rotating error gradient and a measurement light beam interval. And compensating the two types of surface type errors to an interferometer measurement model by adopting a parameterization compensation mechanism, and realizing dynamic error correction through an iterative optimization algorithm. The method can effectively solve the problem of measurement precision caused by deformation of the reflector surface, and provides a reliable measurement basis for an ultra-precise motion control system.

The invention discloses a robot motion control system and control method based on machine vision, relates to the technical field of machine vision, and provides effective data input for an error calculation and correction module by extracting a local feature point set Fp during operation of the system. And the error calculation and correction module calculates an image translation error Et and a rotation error Er based on the feature point set Fp, obtains a translation vector T and a rotation error R by correcting the image position, generates a complete panoramic image P, and provides reliable visual information support for subsequent target positioning and path planning. The motion control and target positioning module is combined with a panoramic image P and a positioning algorithm, so that the target positioning precision is improved, the path planning is optimized, the problems of image dislocation, positioning errors and path instability in a traditional method are solved, and the adaptive capacity and task execution efficiency of the robot in a dynamic environment are greatly improved.

The invention discloses a six-degree-of-freedom object pose estimation system and method in an industrial scene and a medium, and the system comprises a multi-modal data preprocessing module, a shared encoder feature extraction module, a comparative learning and attention fusion module, a pose regression and rotation decoupling module, and a simulation driving-based data enhancement module. The multi-modal data preprocessing module is used for receiving and processing an original RGB image and a depth map, and outputting a pixel-level space aligned RGB-D data pair through filtering and denoising and coordinate projection transformation based on camera internal reference; and the shared encoder feature extraction module is used for extracting features from the aligned RGB-D data pairs and carrying out adaptive weighted fusion through a channel attention mechanism so as to output a shared feature fused with appearance and geometric information. According to the method, the estimation precision can be improved, the ADD index is improved by 12.8% and the rotation error is reduced by 21.4% in a 70% shielding or light reflection scene, and the method has strong robustness for depth noise, shielding and light reflection and has strong practicability.

The present invention proposes a method for predicting and compensating the position error of an industrial robot in the whole life cycle, including: generating n sample points in the robot's workspace as the robot's theoretical position P; measuring the actual position error E of the sample points by a laser tracker, and establishing a robot position error prediction model; inputting the theoretical position of the point to be compensated into the established error prediction model, the error prediction model is used to predict the robot position error of the point, and then predict the error εl caused by the rotation error of the 1 axis, and then predict the base flexibility error Δf caused by the base deformation; superimposing the predicted position errors εl and Δf on the theoretical position of the point to be measured to obtain the compensated target position P'; inputting the compensation position command of the compensated target position P' into the controller to complete the error compensation of the robot's processing trajectory. The present invention can continuously adjust the position error samples to fine-tune the accuracy of the position error prediction model.

The invention discloses an axial angle deviation correction system and correction method for a dual-optical-domain camera, relates to the field of intelligent image processing, and solves the problems that in an existing dual-optical-domain system, off-axis deviation exists, rotation errors exist in CMOS image sensor assembly, then axial angle deviation exists, and use requirements are further difficult to meet. According to the method, a test fixture is adopted, two cameras are used for shooting the same target screen to obtain two images, then a processor is used for recognizing marked graphs in the centers of the images and calculating the magnification ratio of the two cameras, meanwhile, the center coordinates of the marked graphs are automatically recognized, and correction parameters used for correcting the axial angle deviation of the two cameras are calculated; storing in a memory; in actual use, the processor calculates the images shot by the two cameras by using correction parameters, and finally realizes the superposition of the two images. According to the method, the speed and accuracy of intelligent recognition are improved, and double-object attacks initiated by hackers using two different sceneries on the two cameras are effectively prevented.

The present invention discloses a system and method for measuring the rotation accuracy of a hydrostatic bearing spindle. The system includes: a standard ball, which is fixed on a hydrostatic bearing spindle to achieve coaxial motion with the hydrostatic bearing spindle; an optical measurement system; and a data processing system. When the hydrostatic bearing spindle rotates, the optical measurement system simultaneously collects the displacement of the outer contour of the standard ball, and the collected displacement data is transmitted to the data processing system for error separation calculation. The present invention measures the rotation error of the hydrostatic bearing spindle by combining laser heterodyne interference with a confocal microscope system, and achieves error separation by a three-point method. Not only does it collect a higher-precision rotation displacement through a highly sensitive optical measurement system, but it also improves the rotation measurement accuracy of the hydrostatic bearing spindle.

The present application belongs to the technical field of space geometry measurement, and particularly relates to a virtual multi-view six-degree-of-freedom pose measurement method, medium and system. The pose information of a cooperative target located in a combined field of view is obtained through coaxial cameras and a prism; a virtual camera is formed by rotating the prism; a coordinate system is established; target rotation representation is performed; a first rotation matrix is estimated; a virtual camera visual axis and a visual axis included angle are determined; a second rotation matrix is determined; a rotation error cost function is established; the rotation matrix and the rotation error cost function are represented by a quaternion; multi-rotation information fusion is performed; an exit point and an exit light vector of the prism are determined; feature point coordinates of the cooperative target are represented; determined object-side residuals are determined; an object-side residual cost function is constructed; and translation information fusion is performed. Compared with the prior art, the present application solves the problem that existing six-degree-of-freedom pose measurement devices are susceptible to noise, and the method proposed in the present scheme effectively improves measurement accuracy, adaptability and stability.

The invention discloses a three-dimensional registration method and device, a computer storage medium and a terminal. According to the embodiment of the invention, for a scene comprising a plurality of objects to be processed and images to be processed collected from more than two viewing angles of AR, residual errors still existing in the pose of a registered target object after rotation pose deviation correction are corrected, and the accuracy of the registration is improved. Performing contour projection on the rotation attitude correction pose on the to-be-processed image, searching to obtain candidate edge points, determining a residual error and a Jacobian matrix of the candidate edge points according to an energy function, expanding contour search to a cross-view angle and a constraint object, and feeding back an observation error on the constraint object to correct the rotation attitude correction pose. The amplification of the rotation error is inhibited; by introducing a normalization equation, solving of pose correction and consistency correction of pose residual errors of all objects to be processed are achieved; and performing pose correction on the registered target object according to the pose correction amount reaching the iteration termination condition, and realizing three-dimensional registration of the scene based on the registered target object without the pose residual error.

The invention discloses a method for estimating translation and rotation errors of a kinetic model constraint space reference, and the method comprises the steps: building an observation equation through employing inter-satellite distance measurement observed quantity obtained by satellite-borne inter-satellite link equipment, and building a satellite kinetic equation through employing the modeling of orbit perturbative force; performing space reference translation and rotation transformation on a satellite kinetic equation, and solving partial derivatives of related parameters to obtain a variational equation containing satellite position relative space reference translation and rotation parameters and satellite state parameter partial derivatives; solving the variational equation and the kinetic equation by adopting a numerical integration method to obtain a state transition matrix containing space reference translation and rotation parameters and satellite orbit state parameters, and a satellite reference orbit; a plurality of epoch inter-satellite distance measurement observation equations are linearized by using a satellite reference orbit to obtain a parameter estimation equation, and the equation is solved by using a parameter reduction method to obtain space reference translation and rotation parameter estimation values and estimation precision.

The application provides a high-resolution integrated imaging global correction method for accurately eliminating voxel diffusion, which comprises four processes of accurate characterization of voxel diffusion, pixel rearrangement preprocessing, global optimization of voxel diffusion and accurate three-dimensional reconstruction, the method takes a lens array with multiple rotation errors as a whole, calculates a general equation of a reconstructed light line, obtains an accurate size of voxel diffusion by splitting a voxel diffusion polygon, uses a pixel rearrangement preprocessing method to obtain a pre-corrected micro image array, uses the pre-corrected micro image array as an input of a discriminator in a pixel-to-pixel conditional generative adversarial network, compares the input with an output of a generator until the input and the output match to obtain a corrected micro image array, and finally performs three-dimensional reconstruction on the corrected micro image array by means of an integrated imaging 3D display system, so that the correction process of the voxel diffusion is effectively simplified, the overall resolution is improved, and the recovery of detail features is considered.

A lifting head rotation precision measuring system disclosed by the present invention comprises a power assembly, a rotation assembly, a measuring assembly and a judgment assembly, the power assembly is used for driving the rotation assembly to rotate, the measuring assembly comprises a detection device and a crystal transcoding disc, the crystal transcoding disc is fixedly installed on the rotation assembly, and the crystal transcoding disc rotates along with the rotation assembly. A plurality of code disc hollow parts are uniformly arranged on the periphery of the crystal transcoding disc, and the detection device is used for identifying the code disc hollow parts when the crystal transcoding disc rotates, outputting a first signal when the code disc hollow parts are identified, and outputting a second signal when the code disc hollow parts are not identified. The judgment assembly is used for calculating the rotation error of the rotation assembly according to the difference between the number of the received first signals and the second signals and the theoretical number, and the rotation precision of the rotation assembly is obtained. The code disc hollow part is arranged on the crystal transcoding code disc, the control precision of the upper driving crystal transcoding can be accurately measured according to the comparison between the identification result of the code disc hollow part and the theoretical condition, the cost is low, and the operation is convenient.

The invention relates to a method for eliminating the influence of polarization grating rotation. The method comprises the following steps: firstly, providing a rotation model based on a liquid crystal polarization grating and analyzing a two-dimensional error caused by the rotation of a single grating; mat lab is adopted for simulation, the 10-degree liquid crystal polarization grating is analyzed, and an error value caused in the two-dimensional direction is obtained; secondly, adopting two liquid crystal grating groups through experiments, rotating 10-degree gratings to obtain error data, and comparing the error data with a simulation result to verify the simulation reliability; secondly, carrying out grating rotation error analysis on the two liquid crystal polarization gratings, and respectively fitting an error correction experimental formula and a theoretical formula in a two-dimensional direction; finally, the fitted correction formula is substituted into a system control program, errors caused by grating rotation are corrected, and the light beam pointing precision is improved. The method provided by the invention provides technical support for subsequent application in laser radars, laser weapons and laser communication.

A circle profile error separation method based on discrete sampling point cumulative term and method, it relates to a kind of circle profile error separation method, to solve the problems such as harmonic suppression and long measurement time, complex calculation in prior art, the present application includes the following steps: first position signal is obtained by sensor acquisition, error separation platform is applied to the workpiece to be measured to carry out indexing, so that the workpiece to be measured and instrument rotation main shaft produce a fixed size indexing angle θ=2π / N, i.e. turn through unit sampling angle size, sensor collects second indexing signal at this time, finally, the first and second indexing signals collected are processed, the main shaft rotation error signal is separated from the circle profile error information, and the circle profile signal after removing error is obtained.The signal obtained by the discrete sampling point cumulative term and method for roundness error separation is consistent with the original given signal, which verifies the feasibility and effectiveness of the method for roundness error separation from principle.The present application belongs to the technical field of ultra-precision geometric measurement.

The application discloses a kind of main shaft rotation error measurement method and device based on optical principle.The main shaft rotation error measurement method is as follows: one, constructs coordinate system;Two, the axial error of main shaft is measured using light interference principle, and a beam is separated in the test light of axial error measurement and is shot to PSD, and radial error is obtained.The application sets up taper angle reflector at the end of main shaft, and the axial error of main shaft is measured using laser interference principle, the axial error measured by this mode is not influenced by radial error, the influence of inclination error can also be ignored, the complexity of axial error settlement is greatly reduced, and the detection precision is improved.In addition, while detecting axial and radial error, the application synchronously detects inclination error using annular reflector and laser autocollimator, and separates the measurement error caused by the inclination change of main shaft in radial error using the value of measured inclination error, and improves the detection accuracy of radial error.

The present application provides a position compensation control method and system for a machine tool rotary hopper, the method comprising: determining the standard rotation angle required for station rotation according to the number of stations of the machine tool rotary hopper, and determining the first position information of each station; obtaining image information after the machine tool rotary hopper completes rotation, and determining the second position information of each station through image processing; determining the actual rotation angle of the current ejection station according to the first position information and the second position information; judging whether the rotation angle error of the next ejection station exceeds the rotation error threshold according to the actual rotation angle, the standard rotation angle, and the number of rotations; if the rotation angle error exceeds the rotation error threshold, performing rotation angle compensation on the next rotation of the machine tool rotary hopper according to the rotation angle error, and resetting the number of rotations. Through precise error detection and compensation, the accuracy of the rotation angle is guaranteed, thereby improving the accuracy and efficiency of the entire production process.

The invention provides a machine tool spindle rotation error measurement method based on installation error correction, and the method comprises the steps: fixedly installing a high-precision plane mirror at the central position of the bottom of a spindle cutterhead through a bolt, and fixedly installing a laser interferometer below the high-precision plane mirror; before measurement, corresponding relation data of different installation error values and residual synchronization errors caused by the installation error values are quantitatively calculated; then, calculating an installation error control range required for enabling the residual synchronization error caused by the installation error to be within the required measurement precision; during detection, the installation error of the measuring device is obtained; adjusting the installation error by adjusting the installation position of the laser interferometer until the maximum amplitude (namely the installation error) of the basic synchronous rotation error extracted from the measurement data reaches the required installation error range; and after the installation error adjustment of the measuring device is completed, data acquisition is carried out to obtain the total axial rotation error data of the main shaft, and the axial synchronous and asynchronous rotation errors of the main shaft are calculated.

The present invention relates to an in-situ detection system and method for the rotation error of an ultra-precision machine tool spindle. The system comprises: a first standard spherical reflector and a second standard spherical reflector, respectively disposed at both ends of the machine tool spindle, with the axis of the machine tool spindle passing through the centers of the first and second standard spherical reflectors, respectively; a first optical autocollimator, a second optical autocollimator, a third optical autocollimator, and a fourth optical autocollimator, wherein the visual axes of all optical autocollimators are perpendicular to the axis of the machine tool spindle in a non-deflection state, and the autocollimators are divided into two groups and are perpendicular to each other. Compared with the prior art, the present invention has the advantages of high detection accuracy, fast response, strong data traceability, and comprehensive detection.

The invention provides a high-resolution integrated imaging global correction method capable of accurately eliminating voxel diffusion, which comprises four processes of accurate representation of voxel diffusion, pixel rearrangement preprocessing, global optimization of voxel diffusion and accurate three-dimensional reconstruction, and comprises the following steps: taking a lens array with multiple rotation errors as a whole; the method comprises the following steps: calculating a generalization equation of reconstructed light, obtaining an accurate voxel diffusion size by splitting a voxel diffusion polygon, obtaining a pre-corrected micro-image array by using a pixel rearrangement preprocessing method, taking the pre-corrected micro-image array as the input of a discriminator in a pixel-to-pixel conditional generative adversarial network, and comparing the input with the output of a generator to obtain a reconstructed image. And finally, performing three-dimensional reconstruction on the corrected micro-image array by means of an integrated imaging 3D display system, thereby effectively simplifying the correction process of voxel diffusion, and giving consideration to the recovery of detail features while improving the overall resolution.

The application discloses a kind of for LDI exposure machine horizontal direction calibration error monitoring and compensation method, S1: before exposure to material plate, to platform, camera and exposure lens are calibrated horizontally;S2: each measuring point on the figure coordinate system where material plate is located is converted to platform coordinate system, and the theoretical position coordinates of each measuring point are obtained;After completing horizontal direction calibration, exposure is carried out, by the difference between the theoretical position and actual position of each measuring point is fitted, and the expansion, rotation error of platform in exposure position and the position calibration error of reference lens and reference camera are calculated and compensated, the calibration error of exposure lens magnification, angle and exposure lens position relationship is monitored and compensated, the grid error of platform in exposure position is monitored and compensated, the error generated by each subsystem in horizontal direction can be decomposed and compensated, finally ensure the accuracy of overlay.

The present invention discloses a method and system for compensating for spindle eccentricity error of a circular grating encoder. The method utilizes the principle of evenly arranging capacitive displacement sensors to obtain the instantaneous vector of the spindle axis displacement, establishes a three-point error separation model, separates the roundness error of a standard sphere from the radial rotation error of the spindle, and thereby obtains an accurate radial rotation error of the spindle. A high-precision autocollimator is used to calibrate the circular grating encoder, and the average of multiple measurements is used as the system error to perform angle compensation on the circular grating encoder. Through angle compensation, the circular grating encoder achieves an angular measurement accuracy of ±1.62″ after eliminating the system error, which is two arc seconds higher than the nominal accuracy of ±2.79″. The present invention can effectively eliminate the influence of spindle installation eccentricity on the angular measurement accuracy of the circular grating, and is of great significance for improving the angular measurement accuracy of the circular grating encoder.

A method for correcting time-varying ionospheric error in high-orbit SAR based on Faraday rotation estimation is proposed. The method first performs zero-padding of the azimuth signal, then calculates the azimuth decompression phase, reconstructs the azimuth echo, estimates the time-varying ionospheric error phase, performs time-varying ionospheric error correction, acquires the corrected full image data, and finally obtains the final corrected image data. This invention utilizes the Faraday rotation error caused by the time-varying ionosphere in the fully circularly polarized signal wave of high-orbit SAR. By employing azimuth echo reconstruction and Faraday rotation angle estimation inversion, it can achieve high-precision correction of the time-varying ionospheric error in high-orbit SAR images. Its phase correction accuracy is better than 0.01 rad, and the correlation between the corrected image and the original image is as high as 99%. The system is simple and low-cost.

The invention provides a geomagnetic vector matching navigation method based on deep reinforcement learning and a related device. The electronic equipment obtains a plurality of track points, and determines a plurality of reference track points corresponding to the plurality of track points from a standard geomagnetic isoline according to the actually measured geomagnetic information of the plurality of track points; obtaining a rotation deviation and a translation deviation according to the plurality of track points and the plurality of reference track points; and adjusting the positions of the plurality of track points according to the rotation deviation and the translation deviation to obtain a plurality of updated track points. Therefore, a plurality of pieces of actually measured geomagnetic information on the standard geomagnetic isoline are introduced to serve as the reference basis, it is ensured that the error correction process has clear physical significance and reliable reference basis, and the accuracy of error correction is improved by correcting the translation error and the rotation error at the same time. The problem of insufficient positioning precision caused by single-dimension correction in a traditional geomagnetic contour matching method is solved, so that the positioning precision is improved.

The application discloses a kind of for the correction method and device of cone beam CT system geometry parameter error, method includes: acquisition projection image projected on flat panel detector;Obtain the geometry parameter error of cone beam CT system;By the translation error of transverse and longitudinal of the plane where flat panel detector is, correct projection image, obtain first correction image;The normal rotation error of the plane where flat panel detector is and the distance error between flat panel detector and ray source are corrected to first correction image, obtain second correction image;For second correction image, respectively correct along the rotation error of transverse and longitudinal of the plane where flat panel detector is, obtain third correction image;The distance error of third correction image's rotating table and ray source is corrected, obtain the ideal image of geometry parameter error correction.By geometry parameter error correction projection image, without adjusting the position of cone beam CT system device, it is easy to calculate, effectively eliminate the influence of system error on image three-dimensional reconstruction.