63 results about "Distortion" patented technology

A circuit for converting an analog signal to a discrete pulse-width-modulated (PWM) signal uses a delta-sigma amplifier and a discrete PWM stage to produce a discrete PWM output signal having lower in-band signal noise then a PDM system and a lower signal distortion then a continuous PWM system. A multiple bit quantization stage drives the discrete PWM stage.

An imaging environment that greatly affects image recognition accuracy is recognized for applications in onboard systems of various sorts including imaging devices. An imaging device for imaging areas around the vehicle is mounted on a vehicle. Before executing image recognition processing, information is acquired on objects and texture, such as traffic signs and pedestrian crossings, present within a field of view of the imaging device. An object or texture present within the field of view is then recognized by an image recognition section. Degrees of distortion and defocus of a shape or texture of the object recognized are calculated based on the shape or texture of the object recognized and information previously acquired on the objects or texture. Imaging environment, such as water droplets or dirt on a lens, and whether fog occurs or not, is then recognized based on the degrees of distortion and defocus calculated from the shape or texture of the object recognized.

A system and method for limiting amplitude of a signal, such as limiting the loudness of an audio signal. Embodiments of the present invention allow for the most aggressive limiting by using an advanced psychoacoustic model to intelligently determine the amount of limiting that can be done to the incoming signal before producing distortion that is detectable to the human ear.

A method of mitigating distortion in a friction stir weld joint as well as an associated friction stir weld assembly for mitigating distortion in a friction stir weld joint are provided. In this regard, a workpiece having a friction stir weld joint and associated distortion may be provided. Force may then be selectively applied to the workpiece along at least a portion of friction stir weld joint. The application of force induces plastic deformation along at least the portion of the friction stir weld joint in order to reduce the distortion of the workpiece. Force may be applied, for example, by moving a roller, such as a hardened cylindrical roller having chamfered edges, along at least a portion of the friction stir weld joint in order to apply a compressive force.

The invention discloses a real-time gesture recognition method which comprises the steps of (1) decomposing an obtained gesture video into image sequences sorted in a chronological order and preprocessing obtained images and then carrying out hand-region segmentation, (2) extracting a hand shape feature of a hand region in each image and using an SVM support vector machine to identify the hand shape feature as a corresponding gesture value, (3) combining the gesture value of each image and a direction feature of a motion trajectory obtained by an iterating LK pyramid optical flow algorithm asa feature vector of each dynamic gesture image, (4) carrying out loop execution of steps (2) and (3) with a loop end condition that all images of a current video are processed so as to obtain a complete set of feature vector sequences, (5) creating a gesture template library, (6) carrying out optimization DTW match on the obtained feature vector sequences and all templates in a template library, calculating the degree of distortion of the match, wherein recognition is failed if the degree of distortion is larger than a distortion threshold, and a recognition result is outputted if the degree of distortion is smaller than the distortion threshold.

The invention discloses a control method for distribution network active filtering quiescent reactive compensation. The method comprises the following steps: calculating and processing real-time data acquired by a data acquisition system; extracting a fundamental component in the acquired current data; working out a compensatory reference current by the acquired current; calculating the effective value and average value of voltages and currents; calculating the PWM duty ratio of phases in a next control cycle based on the current reference value and the actual measured value, and adding a compensation factor and dead zone control based on the deadbeat; and sending the effective value, the average value and the soft failure information to a fixed-point digital processor through a dual-ported RAM. The method has good performance and a rapid dynamic response, and can effectively reduce the burrs of an emitted current and the distortion of a crossover point, inhibit the harmonic waves in the vicinity of switching frequency, greatly reduce the higher harmonics in the vicinity of the switching frequency, and extract an instruction current precisely without the influence of systematic parameters. The modularized design of the all parts brings about a clear structure for easy tracking and maintenance.

A method for the high pressure die casting of an engine block assembly having at least one cast in place cylinder bore in the engine block and a closed head deck surface, and the resultant engine block are disclosed. This closed deck high pressure die cast engine block assembly will preferably have at least two cast in place cylinder bores in the engine block formed by using a composite core of salt core material supported by at least one cylinder bore to be cast in place. The cylinder bores have a lower outer surface preferably defining at least one surface area that interfaces with the engine block during casting such that the at least one cylinder is cast in place in the engine block. An engine block water jacket—as defined by the salt core portion of the composite core—will preferably provide an open passage between each cylinder bore such that water may flow around and entire outer circumference of the upper outer surface of the cylinder bores. This provides better and more uniform cylinder wall cooling, reducing thermal hot spotting and bore wall distortion.

The invention, which relates to the intelligent control field, discloses a target tracking method and electronic equipment, so that a technical problem that the tracking range is either small or large when a target is tracked by using a camera in the prior art can be solved. The method can be applied to electronic equipment equipped with a first image acquisition device and a second image acquisition device; and the collection viewing angle of the first image acquisition device is a first viewing angle and the collection viewing angle of the second image acquisition device is a second viewing angle different from the first viewing angle. The method comprises: when the electronic equipment tracks a target by the first image acquisition device, a tracking window size of the target is obtained; whether the tracking window size meets a preset condition is determined; and if so, the image acquisition device for target tracking is switched from the first image acquisition device to the second image acquisition device. Therefore, a technical effect of coordination between a tracking range and distortion can be realized, so that an improved tracking effect can be obtained.

The invention discloses a mark structure used for measuring distortion of a projection object lens, which is formed on a mask, a first direction and a second direction which is perpendicular to the first direction are defined on the mask, the mark structure comprises a first figure area and a second figure area, an independent mark is provided on the central position of the first figure area, the second figure area is composed of array marks, and the first figure area and the second figure area are arrayed along the second direction. The invention also discloses a method for measuring the distortion of a projection object lens, which is characterized in that the independent mark is superposed with the central position of the projection object lens object space field, the workpiece bench position is set as xws = x-M*Xij, and yws = y-M *Yi, the independent mark is subjected to exposure, wherein M is the projection object lens multiplying power, x and y are central positions of a silicon chip exposure field; the center of the second figure area or the center of the mask is superposed with the center position of the projection object lens object space field, the workpiece bench position is set as xws = x, yws = y and then the mark is subjected to exposure; the position error delta Xij, and Delta Yij of overlay mark are detected, and the projection object lens distortion is calculated.

The invention relates to the field of optical technology, and discloses an eyepiece with an expanded field angle, which comprises an eyepiece body. The front end surface of the eyepiece body is a first curved surface, the rear end surface of the eyepiece body is a second curved surface, and both the first curved surface and the second curved surface are rotary symmetrical surfaces. The center of the first curved surface is convex outwardly, the edge of the first curved surface is concave inwardly, and the second curved surface is convex outwardly. The eyepiece structure is used for virtual reality device display, the traditional dual-outward convex eyepiece structure is optimized, and on the premise of 2k resolution, in a specific space range, an optical lens with a distortion coefficient lower than 10%, color difference small, the field angle 120 DEG and magnification proper can be realized, and in a small eccentric range in a y direction, good imaging quality can be acquired.

The present invention discloses a method for enhancing a low-illumination image based on a camera response characteristic, including: selecting an exposure model and obtaining a camera response equation model corresponding thereto; determining a parameter of the camera response equation model; estimating an exposure ratio of a multi-exposure image sequence to be generated to an original image so as to generate the multi-exposure image sequence; and performing image fusion on multi-exposure images to obtain an enhanced image with a better visual effect and less distortion. The method can solve the problem that existing low-illumination image enhancement algorithms introduce more artificial traces while enhancing images, and can obtain the enhanced image with the better visual effect and less distortion, thereby obtaining the enhanced image preserving naturalness.

A polyester film for forming which has excellent formability especially at a low temperature and low pressure, is excellent in solvent resistance and heat resistance, and is reduced in the burden to be imposed on the environment. The film comprises a biaxially oriented polyester film and is characterized by containing a copolyester and satisfying the following: (1) the stresses at 100% elongation in the machine direction and the transverse direction each is 10 to 1,000 MPa as measured at 25 DEG C and is 1 to 100 MPa as measured at 100 DEG C, (2) the storage moduli (E') in the machine direction and the transverse direction each is 10 to 1,000 MPa as measured at 100 DEG C and is 5 to 40 MPa as measured at 180 DEG C, and (3) the degree of heat distortion (initial load, 49 mN) in the machine direction as measured at 175 DEG C is from -3% to +3%.

The invention discloses an unloading method based on high/low-frequency vibration load loading, and relates to the field of precise unloading of metal rods. High/low-frequency vibration loads include a high-frequency part with higher frequency and lower vibration amplitude, and a low-frequency part with lower frequency and higher vibration amplitude. One end of a rod with a V-shaped groove gap is fixed; and the high/low-frequency vibration loads are applied to the other one of the rod. The magnitudes and the speeds of the loads with two kinds of frequencies are reasonably controlled, so that the rod forms fatigue rupture at the position of the V-shaped groove gap under the effect of stress concentration. The characteristic that the high/low-frequency vibration loads can quickly enable metal materials to generate and expand cracks is adopted, and the unloading efficiency of metal rods is improved. Compared with the prior art, the technology is a green unloading technology, is high in efficiency, can largely reduce consumption of rods and cutters, and cannot generate defects such as sunk angles, rhombic distortion or horseshoe ports. Due to existence of the V-shaped groove, 45-degree chamfering angles will be formed at two ends of the unloaded rod.

The invention discloses an information hiding method based on a local histogram, and belongs to the technical field of the information security. The method includes: 1) an original carrier image is divided into blocks to acquire boundary points and extreme points of an image block histogram; 2) the boundary points of the image block histogram is embedded with secret information; 3) all image blocks divided by the original carrier image are processed; 4) after the carrier image with the secret information is transmitted, a recipient divides the carrier image with the secret information into blocks, and the size of the blocks is consistent with the size of the blocks in step 1); 5) a histogram of each image block is obtained to get the boundary points and to get the secret information of the boundary points; and 6) after all image blocks of the carrier image with the secret information are processed, the original carrier image is extracted. The method of the invention realizes the important information hiding and protection and at the same time can improve the embedding capacity, and the distortion caused by the movement is avoided.

The invention provides an internal spline gear pitch circle quick positioning device and a machining method of the internal spline gear pitch circle quick positioning device. The internal spline gear pitch circle quick positioning device comprises a round barrel capable of containing an internal spline gear and a retaining frame, wherein three sections of identical arc notches are evenly distributed in the inner wall of the round barrel, the retaining frame is arranged at the top of the round barrel in a sleeved mode, thee ball clusters which are evenly distributed in the circumferential direction of the retaining frame are flexibly hung at the lower portion of the retaining frame, each ball cluster at least comprises a ball, and the ball clusters are respectively clamped by the three sections of arc notches and corresponding tooth sockets of the internal spline gear. The internal spline gear pitch circle quick positioning device can rapidly align and position a pitch circle of the internal spline gear, then machines an internal spline based on the pitch circle, reduces the deviation between the axis of the tooth profile and the axis of the internal spline caused by heat treatment distortion, improves production efficiency, is simple in structure and is convenient to use.

The invention provides a directional modulation signal design method based on spatial Fourier transformation. The method comprises the following steps of establishing desired phase wave beam spatial coverage functions in ideal conditions relative to different communication models; and acquiring a phased array element weighted value according to the spatial Fourier transformation pair relation among phase wave beams and the array element weighted value of a phased array in a directional modulation signal transmitter to achieve a directional modulation signal design in different communication models. By using the directional modulation signals designed by the method, valid users can normally demodulate received directional modulation signals through common digital signal receivers. As to wiretappers in undesirable directions, their wiretapping receivers cannot demodulate useful communication information from received signals due to the relative phase relationship distortion of constellation points in a received signal constellation diagram. The invention provides a safe transmission method for transmitting communication information in wireless channels.

The invention aims at providing a measurement support device, an endoscope system, and a processor for an endoscope system capable of displaying an accurate indicator with a simple configuration. In a measurement support device related to one aspect of the invention, the coordinates of a spot, and coordinates of points indicating an actual size of a measurement target in a subject and indicating a circular marker distorted in accordance with distortion aberration of an imaging optical system are stored in association with each other in a storage unit, the coordinates of the points indicating the circular marker are acquired with reference to the storage unit on the basis of the measured coordinates of the spot, and the circular marker is displayed on the basis of the acquired coordinates. Thus, the distance measurement is unnecessary, the configuration is simple, and the processing load is low. Additionally, since the circular marker is displayed in the vicinity of the spot (for example, centering on a spot position), there is little deviation between the spot position and a marker position, the circular marker is accurate as an indicator. Additionally, since the indicator is not widely displayed, there is little processing load.

The invention discloses a gradient coil for magnetic resonance imaging and a processing method thereof. The gradient coil comprises an insulating base plate and at least three sub-coils; at least onesub-coil is a curved coil, and the remaining sub-coils are planar coils; the first surface of the insulating base plate forms a curved portion and the second surface forms a planar portion; the curvedcoil is fixed on the curved portion; the shape of the curved coil is adapted to the shape of the curved portion; and the planar coil is fixed on the planar portion. The invention also discloses a processing method for a gradient coil for magnetic resonance imaging. Deformation of the coil during the processing process can be effectively avoided, the processing precision and the performance of thegradient coil are improved, the efficiency and the gradient strength of the gradient coil are improved, image distortion can be effectively avoided, and the image quality is improved.

The invention belongs to the field of current-steering digital-analog converters, and specifically relates to a current-steering digital-analog converter high-potential current source unit switch decoding circuit. The circuit is disposed on a matrix formed by high-potential current source units of a current-steering digital-analog converter, and comprises a random column decoding circuit and a random row decoding circuit. The circuit can generate a random column decoding signal and a random row decoding signal according a high-potential bit signal of an input code of the current-steering digital-analog converter DAC, and enables the high-potential current source units, corresponding to the random column decoding signal and the random row decoding signal, in the matrix to be opened. The random column decoding signal and the random row decoding signal, which are generated at each time according to the high-potential bit signals of the input code of the DAC, are different, and the openedhigh-potential current source units are different, thereby improving the performance of the SFDR (Spurious Free Dynamic Range) of the current-steering digital-analog converter, wherein the SFDR indicates the difference between input signal energy and the maximum distortion energy.

The invention discloses a speech recognition system and a speech recognition method. The speech recognition system includes a transfer function storage storing a vehicle transfer function, which represents an acoustic environment in a vehicle and frequency response characteristic of a microphone; a signal-to-noise ratio (SNR) estimator estimating an SNR of an input signal received from the microphone; a speech section determiner determining a speech section to which the vehicle transfer function is applied based on the SNR; a frequency pattern extractor extracting a feature pattern of the speech signal of which the frequency distortion is compensated; and a speech recognition engine recognizing a speech command by using the feature pattern.

The invention relates to a hysteresis-free electrodynamic transducer with a motional impedance rectifying return circuit. The electrodynamic transducer can be used for loudspeakers, earphones, sound sensors and the like, and the electrodynamic transducer comprises a movement coil, a disincentive fixed coil, a magnetic circuit and a vibration membrane. The movement coil is located in the center of the magnetic circuit and drives the vibration membrane to produce sound, the disincentive fixed coil is fixed at the appropriate position of the magnetic circuit position, and the disincentive fixed coil is in antiphase connection with the movement coil, and the electrodynamic transducer further comprises the motional impedance rectifying return circuit which is composed of an inductor, a capacitor and a resistor. The hysteresis-free electrodynamic transducer is characterized in that the motional impedance rectifying return circuit composed of the inductor, the capacitor and the resistor rectifies impedance difference of the motional impedance of the movement coil and the impedance of the disincentive fixed coil, motivation energy acted on the magnetic circuit through the movement coil and the disincentive fixed coil mutually drops to the minimum, distortion of the loudspeakers and the earphones caused by loudspeakers and earphones is reduced to the minimum, and sound distortion of the vibration membrane connected with the movement coil is reduced.

The invention discloses a high-nodularity nodulizer for nodular cast iron. The nodulizer is prepared from the following components in percentage by weight: 16% of Mg and Si, 3.0% of Re, 2.1% of Ca, 2.0% of Ba, 0.05% of Bi, 0.09% of Ti, 0.3% of Al, 1.0% of rare earth and Fe in balancing amount. The nodulizer prepared according to the invention adopts rare earth made from yttria, gadolinium oxide, holmium oxide and cerium oxide, so that the nodulizer is greatly enhanced in molten iron purification capacity, nodulizing capacity, nodulizing degeneration resistance and graphite distortion resistance, has a little chilling tendency, can refine a matrix structure, can prevent a resulfurization phenomenon, has high boiling point, can inhibit interference of anti-nodulizing elements, can improve the impact toughness of the nodular cast iron, can also improve the nodularity and the quality of a casting and has the characteristics of energy saving and pollution prevention; the nodulizer can effectively inhibit a nodulizing degeneration phenomenon of the nodular cast iron and meanwhile can accurately control the nodulizing reaction time; and owing to a synergistic effect of the added elements, the strength, hardness and heat resistance of the alloy can be effectively improved, and the nodularity can be greatly improved.

The embodiment of the invention discloses a method and a device for determining a priority to schedule packets. In the embodiment of the invention, two different interception modes are adopted to intercept code streams of groups of pictures (GOP), total distortion of each frame of the pictures is obtained by decoding twice under two different interception modes, and the total distortion of each frame of the groups of pictures under different interception modes and current frame distortion of each frame of the pictures in the groups are adopted to obtain the influence weight of each scheduled packet on the group of pictures in each frame to the groups of pictures, thus having relatively less decoding times and greatly lowering the complexity for determining the priority to schedule packets.