140results about How to "High precision calibration" patented technology

An image processing apparatus and method for detecting and correcting a defective pixel in an image output from an image sensor including a plurality of pixels, comprising detection of an edge direction based on the image data, detection of a defective pixel included in the image sensor based on the detected edge direction, and correction of the selected defective pixel.

The present invention provides an electric power steering apparatus that can detect straight traveling surely without using a special sensor or the like and can perform highly accurate correction of a neutral steering angle on which a latest steering angle, at the time when it is judged that a vehicle is traveling straight, is reflected. The electric power steering apparatus judges straight traveling of a vehicle on the basis of a steering torque, a traveling speed, and a steering angle speed that is calculated on the basis of the steering angle and corrects a neutral angle indicated by the steering angle after a period, in which the straight traveling judging means judges that the vehicle is traveling straight, continues for a continuous judging time or more and during a straight traveling continuing period in which the straight traveling judging means continues to judge that the vehicle is traveling straight.

An image capture apparatus includes: an image sensor having a plurality of pixels that photoelectrically convert an object image formed by an imaging optical system, each of the pixels having one microlens and a photoelectric conversion portion that has been divided into a plurality of portions; a focus detection unit configured to correct an image shift amount detected with a phase difference detection method using focus detection signal arrays of two images obtained by the photoelectric conversion portions divided into a plurality of portions; and a controller that calculates information corresponding to a movement amount of a lens of the imaging optical system based on the image shift amount detected and corrected by the focus detection unit, and controls movement of the lens of the imaging optical system.

A method for performing scattered radiation correction. The position of a collimator and the width of a slit are adjusted so that direct radiation will fall on one of a plurality of arrays of detectors. A predetermined phantom is scanned. The scan is performed relative to each of the plurality of arrays of detectors. Based on data detected during each scan, scattered radiation correction data is produced. The produced scattered radiation correction data is used to correct projection data acquired by scanning a subject.

In a parameter correction circuit in an LSI, a reference resistor element with high precision having a resistance value set to a target value is connected to an external terminal of the LSI. A constant current from a mirror circuit connected to a current supply flows through the reference resistor element. A voltage value generated in the reference resistor element is measured by a voltage measuring circuit. The constant current also flows through a variable resistor element. The resistance value of the variable resistor element is adjusted so that a voltage generated in the variable resistor element corresponds to the voltage generated by the reference resistor element.

The invention discloses a triaxial MEMS gyroscope rotation integral calibration method based on a uniaxial turntable. According to the invention, first, a triaxial MEMS gyroscope error model is established; the triaxial MEMS gyroscope is fixed on the uniaxial turntable; MEMS gyroscope six-position rotary calibration is carried out; test data and sampling time of 12 times of rotation of the MEMS gyroscope at the 6 positions are tested and recorded; through the 12 times of rotation of the MEMS gyroscope at the 6 positions, a MEMS gyroscope error model is simplified, and an error model after gyroscope rotation is obtained; integral calculations are carried out upon two sides of the equation of the error model after gyroscope rotation, an error equation set is established, and MEMS gyroscope error coefficient is obtained by calculation. With the method provided by the invention, calibration precision is ensured; and fixed zero bias, scale factor, cross-coupling error coefficient, and acceleration sensitivity coefficient of the MEMS gyroscope can be solved rapidly, such that calibration efficiency is improved.

A high-productivity calibration device for an onboard camera, which can calibrate an onboard camera with good precision in a short amount of time and with a simple configuration. Based on the actual coordinates identified on the projection plane of the camera coordinate system and on the converted coordinates which were converted from the initial coordinates of calibration points using pre-finalized camera adjustment values, the adjustment values for the angles of rotation around one or two axes among the three axes of the camera coordinate system are computed and the camera adjustment values are updated. Then, based on the actual coordinates and on the converted coordinates based on the updated camera adjustment values, the adjustment values for the angles of rotation around the remaining axes of the camera coordinate system are computed and the camera adjustment values are updated. When predetermined completion conditions are satisfied, the updated camera adjustment values are finalized.

A telescopic differential operational amplifier circuit for use in a pipelined A / D converter is provided with two auxiliary differential amplifiers connected to two cascode circuits, each including cascode-connected first to fourth transistors. During the sampling phase, first and second switches are turned on to apply a predetermined bias voltage to the gates of first and fourth transistors, and the input terminal of the differential operational amplifier circuit is set to a common mode voltage. During the hold phase, the first and second switches are turned off so that a voltage of each of the gates of the first and fourth transistors change to follow an input signal inputted via the input terminal with coupling capacitors operating as a level shifter of the input signal. Then the differential operational amplifier circuit performs push-pull operation operative only in a transconductance drive region, and is prevented from operating in a slewing region.

A gray level shift is detected as to adjacent pixels in the same field as that of an original signal inputted, so that gray level information is obtained. Concurrently with this step, a motion speed of the picture is detected as to each pixel of the original signal, so that motion information is obtained. A correction gray level signal according to the foregoing gray level information and motion information is obtained, and the correction gray level signal is outputted to the original signal. It therefore results in that a motion picture pseudo contour is detected as to two factors of space and time, and hence, not only the magnitude of gray level turbulence but also a range of pixels affected by the gray level turbulence can be accurately detected.

A drive control apparatus for multiple-winding motor includes: a modulation rate phase command generation unit which calculates currents of first and second inverters for driving a multiple-winding three-phase motor and generates a modulation rate command and a phase command for equalizing the currents; a pulse number determination unit which determines the number of pulses per half cycle on the basis of a frequency command; a pattern table for storing switching patterns; and gate signal generators which control the first and second inverters, using an optimal switching pattern based on the number of pulses, wherein the modulation rate phase command generation unit performs control for equalizing currents of the first and second inverters, and the phase or frequency at which the control is performed is changed in accordance with any of the number of pulses, the modulation rate, the frequency command, and the switching pattern.

The invention relates to a high pressure safety valve detection system which comprises a control system and a water tank; the control system is respectively connected with a pressure sensor, an electric pressure-regulating valve, a first solenoid valve, and a second solenoid valve; the pressure sensor is connected with a double-needle pressure gauge; the first solenoid valve and the second solenoid valve are in parallel connection, and are connected to a first air filter; two ends of the first air filter are respectively connected with a first driving air inlet and the electric pressure-regulating valve; the other end of the electric pressure-regulating valve is connected with a first governing valve; the first governing valve is connected with a booster pump and a second governing valve; the second governing valve is connected with a manual pressure-regulating valve; a pressure gauge is mounted on the manual pressure-regulating valve; the manual pressure-regulating valve is connected with a second air filter; the second air filter is connected with a second driving air inlet. The beneficial effects of the invention are that: high-precision calibration of the high pressure safety valve is realized; the automation level is high; all operations of the operators can be performed only at a measurement and control bench after all is in order; the labor intensity is decreased, and the safety hidden danger is reduced.

In an image output device a test chart 18 including tests charts 6 of each color is used, and a tone correction table is calculated. The test charts 6 are patterned in a checkered pattern, each including continuous areas 10 in which the tones increase in steps and reference areas 11 for comparison with the continuous areas 10. The reference areas 11 are formed of white ground of paper in a highlight proof part 7, a solid pattern with a maximum density in a shadow proof part 8, and halftone dot-concentrated or line screens with a lower resolution than in the continuous areas in a middle proof part 9. Tone correction values are calculated from characteristic values of the highlight, shadow and middle parts, obtained from visual data of the test chart 18.

A mask pattern correction method includes the step of extracting a correction target edge from a design pattern, the step of calculating the distance from the correction target edge to the nearest edge of an adjacent pattern, the step of calculating the correction value by a simulation in accordance with a pattern layout present within a given range determined by the correction target edge, and moving the correction target edge on the basis of the calculated correction value when the distance calculated in the distance calculation step is smaller than a predetermined distance, and the step of moving the correction target edge on the basis of an correction value set as a rule in advance in accordance with the distance when the distance calculated in the distance calculation step is larger than the predetermined distance.

This invention provides a corrected image generating apparatus and the like for generating a corrected image by correcting a deflection due to the vibration of a camera in a raw image obtained by the camera which obtains the raw images of plural frames successively by scanning an object field of vision repeatedly in a scanning direction intersecting the arrangement direction of plural light receiving sensors composing the one-dimensional image pickup device in which the plural light receiving sensors are arranged one-dimensionally, in order to generate an image whose deflection is corrected. By obtaining a motion vector of each of short strips extending in the arrangement direction of the light receiving sensors of the one-dimensional image pickup device, the respective short strips are moved to obtain a corrected image.

A receiving apparatus includes: a clock unit that outputs time information; a synchronizing (sync) packet receiving unit that receives a sync packet which contains transmitting time information and which is sent from a transmitting apparatus over an asynchronous network; a magnitude-of-jitter calculation unit that calculates as a magnitude of a jitter a difference between a first difference, which is a difference between the receiving times of two adjoining sync packets received by the sync packet receiving unit, and a second difference which is a difference between the transmitting times of the two sync packets; a delay time estimation unit that obtains the delay time of the sync packet on the basis of magnitudes of jitters calculated by the magnitude-of-jitter calculation unit; and a time correction unit that compensates the transmitting time of the sync packet, which is received by the sync packet receiving unit, on the basis of the delay time of the sync packet, which is obtained by the delay time estimation unit, so as to obtain a compensated time, and rewrites and corrects the time of the clock unit with the compensated time.

A radio transmitting apparatus includes a calibration reference signal generator for generating a calibration reference signal for each of the subcarriers to be calibrated, a subcarrier modulator for modulating the calibration reference signal with the subcarrier, a radio transmitter for frequency-converting a baseband signal, which is the modulated signal, into a transmission signal in a radio frequency band, a radio receiver for frequency-converting the transmission signal in the radio frequency band supplied from the radio transmitter, into a baseband signal, a calibration coefficient measurer for calculating a calibration coefficient from the baseband signal output from the radio receiver, and a calibration coefficient multiplier for multiplying a transmission signal for each of the subcarriers and each of the antenna elements, by the calculated calibration coefficient.

A GPSR multi-frequency measuring ionospheric delay correction mechanism comprises an ionospheric delay corrective section for estimating an ionospheric delay coefficient based on pseudo-range data measured as an observation on multi-frequency, and for generating an ionospheric delay corrected pseudo-range based on the estimated ionospheric delay coefficient. The pseudo-range data measured as the observation on multi-frequency by using the GPS receiver or the positioning tool is acquired, and the ionospheric delay coefficient is estimated based on the pseudo-range data. An ionospheric delay corrected pseudo-range is then generated using the estimated ionospheric delay coefficient.

The invention relates to a vehicle exhaust remote sensing and supervision system and a self-learning high-emission vehicle decision algorithm. The decision algorithm comprises the following steps of (S1) collecting time synchronization data of a calibrated vehicle through an exhaust remote sensing monitoring station and vehicle-mounted exhaust detection equipment, wherein the data include an operating condition, pollutant concentration, vehicle information, road information, environmental parameters and a decision result; (S2) merging the time synchronization data obtained through the exhaust remote sensing monitoring station and the vehicle-mounted exhaust detection equipment into an exhaust emission data set of the calibrated vehicle; (S3) carrying out cleaning treatment on the data in a sample data set; and (S4) establishing a self-learning emission decision algorithm model for the sample data set in the step (S3), training an exhaust remote sensing detection result correction model of the calibrated vehicle by taking the exhaust emission data set of the calibrated vehicle as an input variable and the decision result of the vehicle-mounted exhaust detection equipment as an output variable and achieving real-time online or offline correction of the exhaust remote sensing detection result of the calibrated vehicle, thereby making the high-emission vehicle decision result more reliable.

A high-accuracy calibration method for a range finder which captures an image involving much lens aberration. The calibration method is used for estimating the camera parameter representing the characteristic of each imaging system which a binocular range finer (3) has. The method includes an imaging step of imaging a reference chart (30) on which a geometric pattern composed of arranged elements is shown and which is disposed in a predetermined position relationship with a binocular range finder (3), an aberration brightness correcting step of correcting the brightness distribution due to the lens aberration in the captured image of the reference chart (30), a feature point position calculating step of calculating the positions of the centers of gravity of the elements shown in the image the brightness distribution of which is corrected as the feature point positions, and a camera parameter estimation calculating step of estimating a camera parameter by using the calculated feature point positions and the actual substantial centers of gravity of the reference chart (30).

The present invention pertains to a Hall electromotive force correction device and Hall electromotive force correction method for highly accurately correcting the magnetic sensitivity of a Hall element by correcting the stress and correcting the temperature, while reducing an increase in layout surface area or increase in current consumed. A Hall resistance measurement unit (13) measures the Hall resistance value (VR) in two or more directions of conduction between a plurality of electrodes belonging to a Hall element (11). A Hall electromotive force measurement unit (14) measures the Hall electromotive force (VH) of the Hall element. A temperature measurement unit (15) measures the ambient temperature of the Hall element. A correction signal generation unit (20) corrects the Hall electromotive force on the basis of the Hall resistance value given by the Hall resistance measurement unit and the temperature output value (T) of the temperature measurement unit. A correction factor computation circuit (21) calculates a correction factor (K) from the Hall resistance value measured by the Hall resistance measurement unit and the temperature output value measured by the temperature measurement unit. The correction factor comprises a stress correction factor (Ksigma) and a temperature correction factor (KT).

A surface texture measuring instrument provided with a near-field measuring unit (30) including a near-field probe (33) that forms a near-field light at a tip end thereof when a laser beam is irradiated, a laser source (35) that generates the laser beam to be irradiated on the near-field probe (33), a detection element (38) that detects scattering effect of the near-field light generated when the near-field probe (33) is moved close to a workpiece (1), and an actuator (32) that displaces the near-field probe (33) and the workpiece (1) in a direction moving close to / away from each other, includes: a laser length-measuring unit (20) that measures a relative distance between a reference position and the workpiece (1) in the vicinity of the tip end of the near-field probe (33) or a relative distance between the reference position and the near-field probe (33).

An image processing device that can highly precisely correct an image with a degraded image quality due to the unnecessary diffracted light generated in the optical system including the diffractive optical element is provided. The image processing device includes an evaluation area setting unit (111) which detects a saturated pixel having a saturated luminance value, from among pixels included in the image and to set an area in the image including the detected saturated pixel as an evaluation area, a pixel count calculating unit (112) which calculates a pixel count for each of luminance values of pixels included in the set evaluation area, a first luminance value determining unit (113) which determines a first luminance value indicating a maximum luminance of an image of the unnecessary diffracted light, based on a transition of calculated pixel counts arranged in order of luminance value, a second luminance value determining unit (114) which determines a second luminance value which is a luminance value corresponding to a background of the image, and a correction unit (116) which corrects a luminance value of a pixel of luminance lower than luminance of the first luminance value and higher than luminance of the second luminance value from among the pixels included in the evaluation area so as to lower the luminance of the pixel.

An apparatus for reading and / or writing data from / on a medium with a light beam includes: a light source for generating the light beam; an objective lens for focusing the beam onto the medium; a lens shift sensor for sensing how much the optical axis of the objective lens has shifted from that of the beam; a wavefront corrector, in which correcting elements are arranged as a two-dimensional array so as to locally correct the wavefront of the beam and to be driven independently of each other; a wavefront calculator for finding correlation between each coordinate on a cross section of the beam and the wavefront phase of the beam; a lens shift correction calculator for modifying the coordinate-wavefront phase correlation according to the output of the lens shift sensor; and a controller for controlling the wavefront corrector in accordance with the output of the lens shift correction calculator.

The invention relates to a method for regulating the temperature of the calibration volume of an apparatus for comparative calibration of temperature sensors to a target temperature, wherein said calibration device comprises heat sources and / or heat sinks, which are in thermal contact via a heat conducting part or a plurality of heat conducting parts with the calibration volume, wherein in at least one process step the real thermal state is calculated, wherein the Kalman filter is fed the measurement values of a temperature sensor located in the calibration device, and in at least one more process step the future thermal state is calculated using a thermal model of the dynamics of states.

A thermal displacement compensation device detects the temperature of a machine tool and the temperature of an environment in which the machine tool is placed, and estimates a temperature distribution in a machine component affected by the temperature of the environment from the relationship between the temperature of the machine tool and the temperature of the environment. Based on the estimated temperature distribution in the machine component, a position in the machine tool at which the time constant of the detected temperature matches the time constant of thermal displacement of the machine component affected by the temperature of the environment is found and set. Using temperature at the set position as a revised temperature of temperature detected by the machine temperature detection section, a thermal displacement amount of the machine component is calculated.