243 results about "Angular variation" patented technology

Analysis of multi-spectral data for extraction of chlorophyll content. Multi-spectral data is obtained from an imaging device. The multi-spectral data contains spectral response data for chlorophyll and background data. The background data is removed from the multi-spectral data to isolate the spectral response due only to chlorophyll. This is then presented as a chlorophyll absorption feature which may be analyzed by measuring the width of the feature, the surface area of the feature, or measuring various angular changes of the feature. These measurements may than be used for a variety of purposes including plant health analysis.

The invention provides an MS-KCF (MobileNet-SSD-kernelized correlation filters) based rapid and stable detection method of a human face in an image sequence. To solve the problem about detection of the human face with larger angle change and very severe shielding in the image sequence, a new automatic DTD (detection-tracking-detection) mode integrating rapid and accurate target detection model MSand rapid tracking model KCF is provided, that is, an MS-KCF human face detection model is provided. The method comprises steps as follows: S1, establishing an MS detection network; S2, detecting a target by use of the MS network; S3, updating the tracking model to predict the position of the next frame of human face target; S4, updating an MS detection network after tracking several frames, and performing redetection and positioning on the human face target; S5, comparing and analyzing experiment results. Experiments prove that the MS-KFC model guarantees the detection stability of the humanface with larger angle change and very severe shielding in the image sequence, and besides, the detection speed is greatly increased.

An articulated seating mechanism including a rocker base, a seat plate, and a pair of side rails, each having an arcuate side. The side rails may be disposed downwardly from the seat plate or upwardly from the rocker base. First and second arcuate gear portions are disposed on the arcuate side of each of the side rails and a first and second substantially flat or linear gear racks are affixed either to the underside of the seat plate or the upper side of the rocker base, so as to bring the linear gears and the arcuate gears into intermeshing relationship. A back support is pivotally connected to the seat plate and to first and second back links, and the back links are pivotally connected to the rocker base to provide a rocking motion of the seat plate and a dynamic synchronous adjustment of the angular variation between the seat plate and the back support. The linear gear racks move in a tangent to the arcuate gear portions to provide a moving fulcrum during rocking movements. No springs or other force means are necessary to assist in moving easily from a reclined position to task.

A high-contrast electro-optic liquid crystal camera iris (10) provides angle independent transmission for uniform gray shades. The liquid crystal iris comprises a combination of first and second liquid crystal devices (12, 14) arranged in optical series and positioned between optical polarizers (46, 48). The director field (18) of the second liquid crystal device is a mirror image of the director field (16) of the first liquid crystal device, and the first and second liquid crystal devices are placed together so that the azimuthal directions (42) of the surface-contacting directors (18c, 22c) are in parallel alignment at the adjoining or confronting surfaces of the substrates (242, 321) of the first and second liquid crystal devices. The liquid crystal iris provides, therefore, less angular variation of intermediate transmittances compared with that provided by prior art liquid crystal irises.

A mechanism by which a MEMS gyroscope sensor can be calibrated using data gathered from other sensors in a system incorporating the MEMS gyroscope sensor is provided. Data gathered from an accelerometer and a magnetometer in fixed orientation relative to the gyroscope is used to calculate changes in orientation of a system. A constant acceleration vector measured by the accelerometer and a constant magnetic vector measured by the magnetometer are used as reference vectors in a solution to Wahba's problem to calculate a rotation matrix providing the system's orientation with respect to those two constant vectors. By comparing changes in orientation from one time to a next time, measured rates of angular change can be calculated. The measured rates of angular change can be used along with observed gyroscope rates of angular change as input to a linear regression algorithm, which can be used to compute gyroscope trim parameters.

A positioning apparatus of a vehicle includes a measuring module and a triaxial orientation sensor to provide measured axial accelerations in a Cartesian reference system during a certain time interval. The apparatus also includes a triaxial movement sensor to supply at least one angular variation signal proportional to the axial angular speed of the vehicle during the time interval. A processing unit receives a distance signal proportional to the distance traveled by the vehicle in the time interval, receives the at least one angular variation signal, and supplies at least one reference acceleration of the vehicle. An estimator-calibrator block recursively estimates at least one calibrated acceleration as a function of the measured axial accelerations and of the at least one reference acceleration. The estimator-calibrator block includes a calculation unit to calculate an altitude variation as function of the distance signal and recursively calculates an estimated pitch angle as a function of at least one calibrated acceleration.

The invention relates to a parallel flexible cable suspension simulation system and a parallel flexible cable suspension simulation method applying the system, which are suitable for simulation of a parallel flexible cable suspension simulation system. The device comprises driving components, movable platforms, a guide component and tension measurement components, wherein the four movable platforms are in symmetric arrangement about the center of a square; one driving component and one tension measurement component are arranged on each of the movable platforms; the driving components are connected through four flexible cables and a hanging disk; the four driving components drive the four flexible cables through a motor to further drive the hanging disk to perform movement; the four movable platforms drive the driving components to perform movement, so as to realize suspension at different positions; when the centre-of-gravity position of the hanging disk is changed, the tension measurement components transmit a signal to a self-leveling control system after monitoring that the tensions of the four flexible cables are changed, the control system controls the motor to perform motion after analyzing the signal, the action of the hanging disk is automatically leveled, the angular variation of the hanging disk is compensated, and the hanging disk can always be in a horizontal attitude. The parallel flexible cable suspension simulation system is simple in structure, can realize real-time fine regulation and suspension at different positions.

A method of determining vehicle entry information for a user includes obtaining a yaw measurement using a mobile device, determining, using a processor, a first time span associated with a user entering a vehicle, and determining, using the processor, a second time span associated with a user exiting the vehicle. The method also includes determining that a change in magnitude over a portion of the yaw measurement is greater than a predetermined threshold over at least one of the first time span or the second time span and determining an angular change of the yaw measurement over the predetermined threshold. The method further includes associating right hand entry with the vehicle entry information if the angular orientation of the yaw measurement is clockwise and associating left hand entry with the vehicle entry information if the angular orientation of the yaw measurement is counter-clockwise.

The invention discloses an angle fine tuning device used for tracking small angular variation. The angle fine tuning device comprises a shell with sliding rails at two sides and a hole respectively at the front and back ends, a first articulated shaft transversely penetrating through the sliding rails at the two sides and having a threaded hole in the middle, a second articulated shaft articulated with the first articulated shaft through an articulation piece, and a rotating member fixed at the upper end of the second articulated shaft, wherein one end of the rotating member is articulated with one end of the shell; a motor is fixedly arranged on a worm gear reducer and is arranged at the other end of the shell; a screw rod permeates through the bearing in the holes at the front and back ends of the shell and the threaded hole in the middle of the articulated shaft, and the output shaft of the worm gear reducer is connected through a shaft coupler; the motor rotates to drive the screw rod to rotate; the screw rod drives the first articulated shaft to move along the sliding rails; the rotating member rotates around the articulated place at one end of the shell; and an inclination angle dial can display a rotated inclination angle. The angle fine tuning device used for tracking the small angular variation can fine-tune the rotating member between 0 degree and 90 degrees, has a simple structure, runs steadily and is capable of reading an angle instantly.

Incoherent millimetre wave, sub-millimetre wave and terahertz test signals are used to probe metal substrates that are covered by a protective coating or outer layer, such as paint or thermal insulation, obscuring direct assessment of the substrate. The incoherent test signals, which may be from a naturally occurring passive source (such as the sky) and/or from an active noise source, provide signal dispersion and angular variation of the test signals with respect to angular incidence to the substrate. Illumination of the substrate permits differentiation between un-corroded and corroded sections of the sample because reflectivity (and emissivity) from a metal-based substrate is heavily dependent on the surface resistivity which in turn is dependent on the corroded state. A detector/camera is arranged to pick up reflections from the substrate and an associated control system identifies regions of the sample that reflect the test signal illumination differently or otherwise indicate a variation from a reference value. The differences therefore signify the presence or lack of corrosion or, indeed, the presence of other abnormalities within or on the substrate.

A continuous geomechanically stable trajectory in a subterranean formation is found by calculating at least one reachable stable position relative to a starting position based on geological data indicative of characteristics of the subterranean formation, and iteratively utilizing the calculated reachable stable position as a new starting position. The calculation may be constrained by a boundary including selected distance and direction relative to the starting position, and selected rate of angle change. Within the constraints of the boundary, the possible new trajectories considered may be discretized. The result of the calculations is a three dimensional tree which defines a stability volume. Pruning of at least some branches of the tree may be employed so that not all stable positions have the preselected number of branches, thereby helping to elongate the tree. Either or both of the tree and stability volume are used to select at least one trajectory. For example, the trajectory may be selected from sets of interconnected stable wellbore positions, or based on some other criteria constrained by the stability volume. The trajectory is then used as the basis for drilling a borehole.

An iris biometric image is analyzed to determine the apparent angle of the eye in the image, relative to an arbitrarily selected reference axis. The angle information is stored for use by the matching engine and/or the image data is modified to normalize the angle relative to the reference axis. In this manner, rotationally normalized data may be stored to facilitate future comparisons, and images obtained in real time may be used for iris identification in a matching engine that automatically compensates for angular variation.

A method for calibration of an industrial robot having a plurality of sections movably connected to each other for rotation about a plurality of movement axes. An angle measuring member is mounted on the robot so that it measures angular changes of the axis or axes to be calibrated, relative to a vertical line. A reference direction is measured. At least one of the axes is selected as a calibration axis and another of the axes is selected as a measuring axis. The robot is moved between at least two calibration positions. The moving includes rotating the robot about the measuring axis. The calibration positions are selected such that the direction of the calibration axis differs from the vertical line. Angular values are read from the angle measuring member in the calibration positions. The calibration axis are calibrated based on the angular values and the measured reference direction.

A high-contrast electro-optic liquid crystal camera iris provides angle independent transmission for uniform gray shades. The liquid crystal iris comprises a combination of first and second liquid crystal devices arranged in optical series and positioned between optical polarizers. The director field of the second liquid crystal device is a mirror image of the director field of the first liquid crystal device, and the first and second liquid crystal devices are placed together so that the azimuthal directions of the surface-contacting directors are in parallel alignment at the adjoining or confronting surfaces of the substrates of the first and second liquid crystal devices. The liquid crystal iris provides, therefore, less angular variation of intermediate transmittances compared with that provided by prior art liquid crystal iris.

The invention discloses a valve closing optimal control method of a transition process of a long distance and mass flow water conveyance system, and relates to the field of pressure pipeline hydraulics simulations. The method comprises the steps that a long distance and mass flow water conveyance engineering hydraulic transition process simulation model is established; on the basis of the pumping station water hammer two stage valve closing, a trial algorithm is adopted to seek feasible region intervals on a first segment valve closing from the closing times and angular variations; according to the obtained feasible region interval, an optimization interval search method is adopted in the feasible region interval to conduct the step-by-step search, an optimal feasible region floating within the design range is obtained, the calculation is terminated, and the optimization control on the valve closing of the transition process of the long distance and mass flow water conveyance system is completed. According to the valve closing optimal control method, the optimal feasible region of the valve closing is achieved, both the pump station unit and the safe operations of the pipeline are satisfied, meanwhile the occurrence of the cutoff and the bridge water hammer is reduced or prevented.

Provided are an easy-to-handle thin diffraction type light-condensing film exhibiting high light transmissivity and condensation ability, and a planar light source device using the film. A hologram optical element using diffraction/interference phenomena based on wave properties of light is used instead of a conventional prism sheet using refraction. As a result, the diffraction type light-condensing film and the planar light source device have high light transmissivity and are thin. In the diffraction type light-condensing film, dependence of bending angle on wave length is low and light entering from an oblique direction is bent in the vertical direction and emitted with spectral separation of white light suppressed. High light-condensation impossible in a conventional optical element is realized by suppressing angular variation in emission light for angular variation in incident light.

The invention discloses a ground three-dimensional laser point cloud based method for realizing automatic extraction of geologic body occurrence. Through utilization of space position and color information of three-dimensional point cloud data and combination of image segmentation and inflection point detection technologies, automatic extraction of the occurrence of exposed geologic body and unexposed geologic body can be realized. The method comprises the steps of acquiring and preprocessing point cloud data; obtaining a text format of the point cloud data; re-sampling the point cloud data to a two-dimensional image through a nearest neighbor method; splitting the two-dimensional image; evaluating the image splitting accuracy; and respectively fitting the exposed geologic body and the unexposed geologic body and computing the occurrence thereof, wherein the unexposed geologic body shows a linear feature in the two-dimensional image, and the large angular variation of the line trend represents the change of the occurrence of the unexposed geologic body, so that computing of the occurrence of the unexposed geologic body is complicated and relates to technologies like inflection point detection, stereographic projection and so on. The method has very important practical application value in extraction of occurrence of the geologic body, and greatly reduces dangerous field measurement work which is time-consuming and effort-consuming.

The invention provides a screen unlocking method and system. The method comprises presetting screen unlocking recognition time and presetting screen unlocking angular variation scopes; enabling a mobile phone screen to enter a locking state; obtaining the angular variation scopes of a mobile phone through a gravity sensor; and activating and lighting the mobile phone screen to unlock the screen if the angular variation scopes of the mobile phone is larger than or equal to the preset screen unlocking angular variation scopes in the preset screen unlocking recognition time. By means of the screen unlocking method and the system, angle variation of a device can be identified through gravity sensing technology, and a purpose of unlocking the screen of the device can be achieved if the variation meets preset conditions.

An optical pickup including: a light source; a diffractive element; an objective lens; and a photodetector, wherein the diffractive element has first to fourth areas provided with a predetermined periodic structure in each of the areas, the second and third areas have phases of the periodic structures of the second and third areas varied at an angle of about 180 degrees, the first area has a phase of the periodic structure in the first area varied from a phase of the periodic structure in the second area at an angle of about 180 degrees, and the fourth area has a phase of the periodic structure in the fourth area varied from a phase of the periodic structure in the third area at an angle of about 180 degrees. The optical pickup can obtain an excellent tracking error signal and improved amplitude when the objective lens is displaced.

The invention relates to a GPS inflexion compensation method which is realized through the following steps: defining the entry of turning state and recording a sampling point if the motion distance exceeds 15 meters or the time exceeds five seconds under the turning state when the angle change per second in three received GPS continuous signal points exceeds ten degrees. The invention has the advantages that an inflexion compensation mechanism is added on the basis of isochronous or equidistant acquisition, sampling points are increased when vehicle turning is detected, so that the transmission data amount of GPRS is reduced.