236results about How to "Reduce calibration error" patented technology

A plurality of correction images are obtained while changing the radiation energy of an incident radiation in the absence of an object. Subsequently, an object image is obtained in the presence of the object by emitting the radiation to the object. Then, the object image is corrected by using a correction image obtained under a radiation energy condition closest to the radiation energy of the obtained object image.

The invention discloses a method for optimizing ultrasonic probe imaging plane space position calibration and belongs to the field of medical ultrasonic three-dimensional imaging and ultrasonic image fusion. The method is an optimizing method for calibrating the transformation relation of the space position of an ultrasonic probe imaging plane and the space position of a space position sensor, namely the space transformation matrix. Under the assisting of a three-dimensional positioning system, the method includes steps of: 1, constructing a three-dimensional positioning system; 2, manufacturing an N-line model; 3, building a coordinate system set of the positioning system; 4, calibrating a placing space position of a water tank model; 5, collecting ultrasonic images under different positions; extracting N-line marks and calculating the ultrasonic plane position; 7, mapping N-line mark points on the ultrasonic images onto a three-dimensional space plane; 8, performing registering on three-dimensional coordinate points on the imaging plane and an N line on the water tank model; 9, performing optimization calculation; and 10, calculating the optimum transformation between an imaging plane and the position sensor. The method has the advantages of reducing errors in space position calibration of the imaging plane.

The invention belongs to the technical field of distribution-type optical fiber sensing measurement, in particular to an optical fiber strain and temperature simultaneous calibration device and a method based on Brillouin scattering. The optical fiber strain and temperature simultaneous calibration device comprises optical fiber Brillouin sensing measurement equipment, a shockproof support frame, a metal pipe and constant-temperature equipment. According to the method, the metal pipe with large and stable linear expansion coefficient is adopted to manufacture the strain calibration device, and the position of an optical fiber is accurately controlled by curving a thread on the outer wall of the metal pipe. Due to the characteristic that the optical fiber on the metal pipe bears strain and temperature at the same time, and the loose optical fiber only bears temperature, the temperature and the strain are calibrated simultaneously. The constant-temperature equipment is used for applying accurate and controllable strain and temperature on the optical fiber and the loose optical fiber on the metal pipe, and calibration of the strain of the optical fiber and temperature coefficient is carried out by means of detailed calibration steps. By means of the strain and temperature high-accuracy simultaneous calibration device and the method of the optical fiber Brillouin sensor, the problems of high strain calibration error and low efficiency of strain and temperature calibration are resolved.

A method and device for measuring the blood pressure of artery and its personalized correction technique are disclosed. A series of the pressure values (P) for sleeve band and the time delay values (Tk) of the relative remote Ke's sounds are obtained. The function relation Tk(P) between said pressure change and sound delay is in turn obtained. Measuring a Tk relative to a P can calculate out the blood pressure change. A regression equation for continuous measurements of arteral blood pressure is used to obtain a personalized correction coefficient.

The invention relates to the technical field of computer vision detection, in particular to a calibrating method for a centralized vision system of a soccer robot; the calibrating method comprises the following steps of: using a system site as a calibrating template, using certain mark points on the site as calibrating reference points, and obtaining pixel coordinates and world coordinates of the calibrating reference points; establishing an imaging model of the camera according to the characteristics of the centralized vision system of the soccer robot, respectively obtaining the internal and external parameters of the camera by using the pixel coordinates and world coordinates of the calibrating reference points and optimizing the related parameters; and by using the internal and external parameters of the camera, establishing pixel coordinates of an original site image to conversion modules of the world coordinates to which planes corresponds, wherein target bodies with different heights are arranged in the planes. The calibrating method belongs to the field of computer vision detection and can be used for calibrating the camera with a vision detection system similar to the centralized vision system of the soccer robot; and the calibrating method is simple, easy to use and higher in accuracy without needing other auxiliary calibrating devices.

The invention relates to a method for calibrating zero offset of a quartz flexible accelerometer component, which is a system grade calibrating method using a velocity error as observed quantity. In the method, the conventional calibration equipment is still used, the six-position calibration scheme has simple operation and high calibration accuracy; and compared with conventional multi-position division calibration test, the calibrating time of the method of the invention is greatly shortened, calibration errors caused by rotary table errors when multiple positions are calibrated are reduced, and the navigation performance of a strapdown inertial navigation system can be improved. The invention provides a practical system grade calibration method for the accelerometer component.

The invention belongs to the technical field of optical measurement, and discloses a calibration method for a telecentric camera. The method comprises the following steps of (1) establishing a world coordinate system, a camera coordinate system, an image coordinate system and a pixel coordinate system in the projection system of a telecentric camera; (2) extracting feature points in a calibration plate image shot by the telecentric camera and figuring out internal parameters; (3) acquiring the difference between the actual coordinate of a calibration point in the image coordinate system and the coordinate of the calibration point of the world coordinate system projected in the image coordinate system during the distortion of the telecentric camera, figuring out the minimum value of the difference through the Levenberg-Marquardt algorithm, and obtaining the distortion coefficient of the telecentric camera at the minimum value. Based on the calibration method for the telecentric camera, the internal parameters and the external parameters of the telecentric camera are accurately obtained. Therefore, the calibration accuracy of the telecentric camera is improved.

The present invention relates to a monocular vision sensor of a welding robot used for the technical field of welding and cutting, and a rapid calibrating method of the relationship between the hands and the eyes of the robot. A minitype CCD camera, the dimming and filtering systems, and a motor driving system of the sensor are arranged on an installation bracket. In the dimming and filtering systems, the dimming lens and the filtering lens are overlapped and arranged on a lens bracket, wherein the connection is realized by means of a movable connecting bar and a driving arm. A driving motor of the motor driving system is connected with a decelerator. The driving arms of the dimming and filtering system are directly connected with an output shaft of the decelerator. In the present invention, the internal and external parameters of the camera are calibrated, at the same time, the world coordinate system is coincident with the coordinate system of the robot, thereby, the denotation of the external parameters of the camera under the world coordinate system is changed into the denotation under the coordinate system of the terminal control point of the welding robot, so as to complete the calibrating of the relationship between the hands and the eyes of the robot.

The present invention belongs to single eye visual sensor and its hand-eye relation quick calibrating method for welding robot. The sensor has mini CCD camera, light dimming and filtering system and motor driving system on support. The light dimming and filtering system has dimming lens and filtering lens set on lens rack and connected via movable link rod with driving arm; the motor driving system has driving motor connected to the speed reducer; and the light dimming and filtering system has its driving arm connected directly to the speed reducer. During the calibration of the inner and outer parameters of the CCD camera, the method of superposing the universal coordinate system and the robot coordinate system is adopted, and the expression of the camera outer parameters in the universal coordinate system is converted into that in welding robot end controlling point coordinate system to complete the hand-eye relation calibration of the welding robot.

The invention belongs to the technical field of robot calibration, and provides a robot hand-eye calibration method and device and a robot. The method comprises the steps: controlling an end effectorof the robot to be aligned with the circle center of a calibration plate after rotating for a preset angle each time in a posture that a flange plane of the robot is parallel to a base plane, and recording the position information and angle information of the end effector during alignment; obtaining the offset of the tool center of the end effector and the flange center on the plane; controlling the end effector to drive a shooting device to move so as to shoot the circle center of the calibration plate, and simultaneously sampling the coordinate position of the end effector and the pixel coordinates of the circle center of the calibration plate in the image shot by the shooting device for N times according to a preset rule; obtaining a point location mapping relationship between a coordinate system of the robot and an image coordinate system of a shooting device; and correcting a tool coordinate system of the robot according to the offset and the point location mapping relationship. According to the embodiment of the invention, the problem of large manual calibration error is solved.

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 line structured light vision measuring system complete calibrating method comprising scanning direction information, and belongs to the line structured light vision system calibrating method field. The line structured light vision measuring system complete calibrating method comprises the steps that based on a help of a relative motion calibrating device of a straight line slide rail system, by combining with a motion coordinate system conversion thinking, a routine light plane calibrating process is directly used to acquire a plurality of opposite relative motion calibrating images comprising light strip position information and scanning direction information at the same time by one time, and therefore calibrating steps are simplified, and at the same time, a calculation amount required by solving a structured light plane space equation of a calculation system is greatly reduced. The line structured light vision measuring system complete calibrating method is advantageous in that a scanning direction vector equation is solved and fitted accurately, and the scanning direction can be any direction, and at last, the completer line structured light vision measuring system calibrating method comprising a vector scanning step is defined and determined again. The line structured light vision measuring system complete calibrating method has double effects of improving calibrating efficiency and reducing calibrating errors.

The invention discloses a line laser sensor automatic calibration device for weld seam tracking. The line laser sensor automatic calibration device comprises a first manual turntable, a second manual turntable, a cross sliding table mechanism and a loading platform; the fixed end of the first manual turntable is connected with a first right-angled connection plate; the rotary end of the first manual turntable is connected with the fixed end of the second manual turntable through a second right-angled connection plate; the rotary end of the second manual turntable is connected with a third right-angled connection plate; the cross sliding table mechanism is arranged on the third right-angled connection plate; the loading platform is arranged on the cross sliding table mechanism; and a dot matrix calibration plate and a light source are arranged on the loading platform. The invention also discloses a line laser sensor automatic calibration method for weld seam tracking. With the four-degree-of freedom line laser sensor calibration device of the invention adopted, operational simplicity in image acquisition in a calibration process and the accuracy of calibration can be improved, and the measurement accuracy of the line laser sensor ranges from -0.02mm to +0.02mm, and accurate pose relations can be provided for subsequent weld seam tracking measurement.

The invention relates to a scaling method of a foundation microwave radiometer. The scaling method comprises: obtaining voltage values output through each channel in different attenuation values, calculating corresponding equivalent brightness temperature values through attenuation values, calculating system non-linear factors and noise source injection noises according to corresponding relation between each equivalent brightness temperature value and the output voltage of each channel, and completing preliminary scaling; according to sounding profile data matching with time and place, establishing a corresponding relation of atmosphere optics thickness and atmosphere quality, substituting scaling parameters, obtaining a scaling relation curve, determining the scaling parameters according to the scaling relation curve; observing cold air and cold air coupling noises at each attenuation value, obtaining voltage values output through each channel at different attenuation values and fitting the attenuation values and the voltage values; calculating the equivalent noise temperature when an antenna aligns with the cold air through the relation of the attenuation values and the output voltage values of the attenuator, and determining the brightness temperature values corresponding to the cold air observed by the foundation microwave radiometer in different time and places.

The present invention relates to a method for improving precision of external reference calibration of a multi-ocular camera based on multiple identification plate images, in order to solve the problem that the modeling error is large caused by that the positional relationship between the multi-phase cameras in the existing three-dimensional modeling is not accurate. The method for using the high precision calibration to calibrate the low precision provided by the present invention, the direction error of the axial direction is calibrated through the single point displacement error so as to reduce the overall calibration error; according to the method provided by the present invention, more spatial calibration information is constantly collected, and the spatial calibration information is taken to calibrate coordinate origin information and compensate the direction axis error, so that the effect that the characteristic with the large error degree is compensated by the information with small error degree; by virtue of the method provided by the present invention, the calibration error of the two-phase camera is reduced from that the original error level of the direction axis can be determined by multi-point measurement to the error level that the origin position can be determined by single-point measurement; and the method of the present invention is applied to the field of camera calibration.

An arithmetic processing section executes an arithmetic process on a flicker correction signal output from a flicker correction signal outputting section and corresponding to the flicker component contained in a video signal of each of specific periods and the video signal of each of the specific periods to form a corrected video signal of the specific period corrected for the flicker component of the specific period for the video signal of each of the specific periods formed as a succession of specific periods and containing a flicker component as supplied from a video signal generating section in response to a correction error signal of each of the specific periods supplied from a correction error detecting section.

The invention provides a micro inertial measurement unit screening method and a combined type micro inertial measurement device. In the screening method, according to a multi-position method, an angular speed conversion matrix is calculated, the spinning top z-axis zero-offset data, changing along with temperature, of the combined type micro inertial measurement device is calculated, and micro inertial measurement units are screened with the minimum curve fitting residual error, changing along with temperature, of spinning top x-axis / y-axis / z-axis zero-offset data of the combined type micro inertial measurement device as the standard; the combined type micro inertial measurement device comprises at least two micro inertial measurement units capable of measuring angular speeds of three axes. The micro inertial measurement units are arranged on an installation platform. The combined type micro inertial measurement device has the advantages that the micro inertial measurement units low in price can be combined to establish an inertial measurement system high in performance, cost is saved, higher reliability is achieved, the influences of temperature changes on spinning top zero-offset are reduced, and effective error compensation of the inertial measurement device is achieved.

The invention provides a calibrating method and device for a mass flow controller (MFC). The mass flow controller is installed in a semiconductor device, and set flow for feeding gas is set in the mass flow controller. The method comprises the steps: while the gas is fed into the chamber, collecting the gas pressure of the chamber; according to the gas pressure of the chamber, calculating the actual flow of the gas; calculating the difference between the actual flow and the set flow; while the difference exceeds the preset difference threshold, judging that the mass flow controller does not meet the specification; otherwise, judging that the mass flow controller meets the specification. The method and device are capable of avoiding the switching between the technology specification and the chamber specification in the process of collecting the chamber gas pressure, solving the problem that the MFC calibration result difference is larger because the measure value difference caused by the switching between the technology specification and the chamber specification in the process of collecting the chamber gas pressure is large, and improving the accuracy of the MFC calibration.

The invention relates to a method for calibrating a three-dimensional micro-touch force sensor, which comprises the following steps: adopting the bending deformation principle of a cantilever beam to acquire a micro-force signal required by calibrating the three-dimensional micro-touch force sensor; measuring the elastic coefficient of the cantilever beam; based on the cantilever beam of the known elastic coefficient, establishing a calibrating system of the three-dimensional micro-touch force sensor, and measuring input-output property coefficients of the calibrating system by applying acting force of different intensity to the sensor; measuring the measuring bar displacement property of the three-dimensional micro-touch force sensor; according to the measured elastic coefficient of the cantilever beam, the input-output property coefficients of the calibrating system and the measuring bar displacement property coefficient of the sensor, establishing a mathematical model to acquire the input-output property coefficients of the sensor; and according to a zero output voltage value of the sensor and the input-output property coefficients of the sensor, establishing an input-output property equation of the sensor so as to finish the calibration of the three-dimensional micro-touch force sensor. The method can realize the calibration of the output property of the three-dimensional micro-touch force sensor, and has the advantages of high and reliable precision and good repeatability.

The invention discloses a hand-eye calibration and coordinate conversion method. The method comprises the steps that a target is arranged at the tail end of a mechanical arm; the tail end of the mechanical arm is controlled to move from the initial coordinate point to the terminal point coordinate point, in the process that the tail end of the mechanical arm moves from the initial coordinate pointto the end point coordinate point, the n-time targets of the three-dimensional coordinates in a camera coordinate system and the three-dimensional coordinates of a machine arm coordinate system are recorded, coordinates of the n groups of targets under the camera coordinate system and coordinates of the machine arm coordinate system are obtained, the coordinates of the target under the camera coordinate system and the dimensional coordinates of the machine arm coordinate system are substituted into a mapping matrix between the camera coordinate system and the machine arm coordinate system tosolve the mapping matrix, and n groups of fitting points are obtained; a residual graph is drawn according to the n groups of initial fitting points, the m groups of outlier points in the n groups ofinitial fitting points are removed, and the n-m groups of target fitting points are substituted into a mapping matrix between the camera coordinate system and the machine arm coordinate system, so that a matrix transformation relation between the camera coordinate system and the mechanical arm coordinate system can be obtained.

The invention discloses an image real-time correction output method for a broad-width scanner. The method includes the following steps: (1) a PC host sends a scanning instruction to an FPGA main control chip; (2) the FPGA main control chip controls N linear CCD image sensors to light on at the same time and controls a CCD transmission module to control the N linear CCD sensors to acquire images synchronously and at the same time, an algorithm module in the FPGA main control chip calculates two correction parameters Alpha and Beta respectively; (3) the linear CCD sensors acquire image data and transmit the image data to analog-to-digital converters and the analog-to-digital converters convert analog signals into digital signals and transmit the digital signals to the algorithm module in the FPGA main control chip to carry out processing; (4) the algorithm module calculates gray level values corrected by all photosensitive units; (5) the FPGA main control chip transmits the gray level values corrected by the photosensitive units to the PC host for processing so as to display images. The image real-time correction output method for the broad-width scanner is reasonable in design, high in processing speed and high in imaging precision.

The invention discloses a thin film pressure transducer and a manufacturing method thereof. The thin film pressure transducer comprises a pedestal and a sensitive core body. A pressure guiding hole is arranged in the pedestal. A buffer assembly used for transmitting a medium pressure and obstructing transmission of medium temperatures is also arranged between the pedestal and the sensitive core body. The manufacturing method comprises the following steps: S1, the pedestal, a sealing membrane and a buffer main body with a through hole are fixedly connected to the sensitive core body from the bottom up; the sensitive core body and the sealing membrane enclose the through hole to form a sealed cavity; S2, the temperature buffer medium is injected into the sealed cavity through a medium guiding hole, and a sealing member is used to seal the medium guiding hole; and S3: wire leading is carried out on the sensitive core body to obtain the thin film pressure transducer. The thin film pressure transducer is advantaged by being little influenced by the medium temperature, resistant to an instantaneous temperature impact, etc.

The invention relates to an automatic correction circuit and a method of a capacitor. The automatic correction circuit comprises a reference capacitor, a capacitor array, a correction circuit and a counting unit, wherein the capacitor array comprises a target capacitor and a plurality of comprehension capacitors. The invention corrects the capacitor array by utilizing an average parameter value generated by multiple corrections so that the capacitor array approaches to the reference capacitor. The invention decides the values of the comprehension capacitors to be connected in parallel to the target capacitor by utilizing the average value of multiple corrections so that errors caused by single correction can be avoided, and correction errors caused by a reference voltage error or noise can be reduced.

The invention discloses an inertial motion capture pose transient calibration method and an inertial motion capture system. The inertial motion capture system comprises a data communication module, one or more pose capture modules and a data terminal, wherein each pose capture module comprises a nine-axis sensor (and a microprocessor), and one of the pose capture modules is a reference module; and pose transient calibration is performed by establishing a relationship among a world coordinate system V(w), an object capture coordinate system and an installation coordinate system in the system. Through the method and the system, a user can transiently and quickly finish system calibration only by adopting a pose, and pose correction and automatic quick adjustment of a skeleton proportion of a virtual model can be performed in the calibration process, so that the matching degree of action nodes is increased, the problem of inconsistent skeleton proportions of the virtual model and an actual object is effectively solved, the actions of a captured object are highly recovered, and the precision of motion capture is improved; and the operation is simple, so that the action capture time is greatly shortened.

The invention discloses a wavelength calibration way for a optical fiber spectrometer, and consists of the following steps, A) a standard light source is applied, standard spectrum is collected through the spectrometer, the image element order number ki of spectrometer receiving element linear array CCD is determined corresponding to the standard light source of different practical wavelength Lambadai; B) the arbitrary three practical wavelength Lambada i and the corresponding image element order number ki are chosen, and in accordance with the above formula, a1, a2, and a3 are determined; C) according to the values of a1, a2, a3 from step B), the calibration calculation wavelength value Lambadai is determined corresponding to every image element order number ki, wherein, the Lambadai is a calibrated wavelength value. The calibrating way of the optical fiber spectrometer is provided by the present invention, the calibration deviation of the calibrating way is much smaller than the calibration deviation of the prior art, and accurate calibration can be done with 3 arbitrary standard spectrum lines, not only the flexibility of the calibration is improved but also the application is easier and more convenient. The invention discloses the calibrated spectrometer applying the above mentioned way at the same time.

The invention discloses a resistor verifying system. The resistor verifying system comprises a reference resistor, a to-be-verified resistor, a constant voltage source, an ampere meter, a temperature sensor, a first calculating unit, an acquiring unit, a second calculating unit and a verifying unit, wherein the constant voltage source is used for applying constant voltage U to ends of the to-be-verified resistor; the ampere meter is used for detecting the current I of a loop where the to-be-verified resistor is located; the temperature sensor is used for detecting current environment temperature t; the constant voltage source, the ampere meter and the temperature sensor are connected through the first calculating unit, and the first calculating unit is used for using the formula R=U / I to obtain the resistance of the to-be-verified resistor under the current environment temperature t; the acquiring unit is used for acquiring the resistivity temperature coefficient alpha corresponding to conductor materials according to the conductor materials of the to-be-verified resistor and the current environment temperature t; the second calculating unit is used for using formula R20=R / (1+ alpha (t-20)) to obtain the resistance R20 of the to-be-verified resistor at 20 DEG C; the verifying unit is used for performing difference value verification on the resistance R20 of the to-be-verified resistor according to the resistance of the reference resistor at 20 DEG C. By the system, verification errors can be reduced effectively, and accuracy and practicality are achieved.

The invention discloses an automobile and a vehicle-mounted radar calibrating method and device. The calibrating method comprises the following steps that the speed of the automobile, the turning angle of a steering wheel of the automobile and the acceleration of the automobile are obtained; whether the automobile is in a uniform-speed linear motion state is determined according to the speed, turning angle and acceleration; if YES, the movement relation of a preset target relative to the automobile is obtained; and a vehicle-mounted radar is calibrated according to the movement relation. According to the calibration method, an extra reference device is not needed, the calibration error is low, a calibration manner is convenient, and the environment adaptability is high.

The invention provides a 3D automobile wheel positioner multi-camera calibration system and method. The 3D automobile wheel positioner multi-camera calibration system and method are mainly used for conducting production and maintenance field calibration on the 3D automobile wheel positioner multi-camera system. The information of the relative positions of two target boards is obtained through a calibration camera, two measurement cameras each obtain the position information of one target board, and finally the relative position relation of the second measurement camera relative to the first measurement camera is calculated. An extra target board is not needed in the calibration system, a calibration rod does not need to be used for rigid connection of the two target boards, calibration results are high in accuracy, the size and the weight of the calibration system are greatly reduced, maintainers can conveniently carry the system, the calibration steps are simple, operation is convenient, and relevant cost is reduced.