62 results about "Distortion analysis" patented technology

Certain embodiments of the present invention provide a system and method for distortion analysis and reduction in an electromagnetic tracker. Certain embodiments of the system include a tracking analysis unit for analyzing a tracking behavior of an instrument and a tracking modification unit for compensating for the tracking behavior of the instrument. The tracking modification unit may compensate for the tracking behavior of the instrument by adjusting the tracking behavior of the instrument. The tracking modification unit may also compensate for the tracking behavior of the instrument by adjusting a tracking system for tracking the instrument. The tracking analysis unit may test the adjusted tracking behavior of the instrument. In an embodiment, the tracking analysis unit generates a map and / or a model of a distortion characteristic of the instrument. The distortion characteristic may be a magnetic field. The distortion handling system is a computer simulated distortion handling system.

Approaches to selection of motion vector (“MV”) precision during video encoding are presented. These approaches can facilitate compression that is effective in terms of rate-distortion performance and / or computational efficiency. For example, a video encoder determines an MV precision for a unit of video from among multiple MV precisions, which include one or more fractional-sample MV precisions and integer-sample MV precision. The video encoder can identify a set of MV values having a fractional-sample MV precision, then select the MV precision for the unit based at least in part on prevalence of MV values (within the set) having a fractional part of zero. Or, the video encoder can perform rate-distortion analysis, where the rate-distortion analysis is biased towards the integer-sample MV precision. Or, the video encoder can collect information about the video and select the MV precision for the unit based at least in part on the collected information.

The techniques introduced here include a system and method for transcoding multimedia content based on the results of content analysis. The determination of specific transcoding parameters, used for transcoding multimedia content, can be performed by utilizing the results of content analysis of the multimedia content. One of the results of the content analysis is the determination of image type of any images included in the multimedia content. The content analysis uses one or more of several techniques, including analyzing content metadata, examining colors of contiguous pixels in the content, using histogram analysis, using compression distortion analysis, analyzing image edges, or examining user provided inputs. Transcoding the multimedia content can include adapting the content to the constraints in delivery and display, processing and storage of user computing devices.

The invention provides an estimation method of distortion performance of a stereo video encoding rate, comprising the following steps: acquiring a multi-view video and acquiring a corresponding multi-view depth map according to the multi-view video; respectively obtaining a multi-view video encoding rate distortion model and a multi-view depth map encoding rate distortion model; respectively obtaining the relationship between multi-view video encoding distortion and virtual view rendering distortion as well as the relationship between the multi-view depth map encoding distortion and the virtual view rendering distortion; and finally establishing a virtual view encoding rendering rate distortion model in a stereo video based on the relationships. By the analysis method of virtual view encoding rendering rate distortion in the stereo video provided by the invention, the distortion performance of the virtual view encoding rendering rate in the stereo video can be accurately and rapidly established so as to provide model guide and solution for problems such as selection of coding parameters, code rate distribution and the like in the stereo video.

The invention discloses a method for full reference type video quality assessments, an apparatus for full reference type video quality assessments and a video quality testing device for full reference type video quality assessments. The method includes that six different spatial parameters are extracted from each of video components of YUV of each ROI of referencing videos and testing videos, so that a pair of difference matrixes can be achieved, utilizing the pair of difference matrixes, time and brightness rough alignment is performed on the referencing videos and the testing videos, and the result of rough alignment can be achieved. According to the result of rough alignment, time, space, brightness and chromaticity precise alignment is performed on the referencing videos and the testing videos, and the result of precise alignment of the pair of video sequences can be achieved. According to the result of precise alignment of the pair of video sequences, the space distortion analysis and the time distortion analysis are conducted to the referencing videos and the testing videos, four space indexes and one time index can be achieved, and a quality assessment result can be achieved according to the four space indexes and the one time index. According to the method, the method for full reference type video quality assessments, the apparatus for full reference type video quality assessments and the video quality testing device for full reference type video quality assessments is capable of getting better result of rough alignment, and the accuracy of the video quality assessment results can be improved.

The invention discloses an electric property prediction method of a cylinder conformal array antenna under load distortion. The method comprises following steps of determining structure parameters and electromagnetic parameters of the cylinder conformal array antenna; carrying out structure load distortion analysis; calculating new positions of array elements after distortion; building an array element rectangular coordinate system and an array element sphere coordinate system, and a conversion matrix between the two coordinate systems; solving an array element directional diagram under the array element rectangular coordinate system; determining a conversion matrix between the array element rectangular coordinate system and an array rectangular coordinate system; solving an array element directional diagram under the array rectangular coordinate system; determining array element execution amplitudes and phases; calculating the space phase difference of each array element; calculating a far region field intensity distribution directional diagram; building an electromechanical coupling model; calculating the electric property parameter of the antenna; and judging whether the calculated electric property parameter satisfies a demand or not. The method can be used for quantitatively evaluating the influence of antenna structure distortion on the electric property of the cylinder conformal array antenna under a load environment, thus instructing the structure design of the cylinder conformal array antenna.

Methods and test equipment for measuring jitter in a Pulse Amplitude Modulated (PAM) transmitter. Under one procedure, a first two-level PAM signal test pattern is used to measure clock-related jitter separated into random and deterministic components, while a second two-level PAM signal test pattern is used to measure oven-odd jitter (EOJ). Under another procedure, A four-level PAM signal test pattern is used to measure jitter-induced noise using distortion analysis. Test equipment are also disclosed for implementing various aspects of the test methods.

A method is described of forming a bitstream by an encoder apparatus comprising: a processor of the encoder apparatus receiving a projected video frame including one or more pixel regions, the one or more pixel regions representing pixels of spherical video data projected onto one or more 2D projection surfaces of a projection model, the projection model being adapted to project spherical video data onto a rectangular 2D surface of a video frame; the processor generating a plurality of different candidate video frames on the basis of the received projected video frame, each candidate video frame being formed by applying at least one operation to one or more groups of pixels in one or more pixel regions of the projected video frame, wherein said at least operation includes a shift, mirror and / or rotation operation; and, wherein said operation is different for each of said plurality of different candidate video frames; the processor applying a rate distortion analysis to each of the candidate video frames to determine a rate distortion cost for each of the candidate video frames; and, the processor selecting a candidate video frame from said plurality of candidate video frames on the basis of the rate distortion cost; and, generating an output bitstream on the basis of the selected candidate video frame.

The present invention provides a system (100) and method (200) for distortion analysis and reduction in an electromagnetic (EM) tracker. The EM tracker may employ coils as receivers and transmitters. Certain embodiments of the system (100) include a tracking analysis unit (120) for analyzing a tracking behavior of an instrument (110) and a tracking modification unit (130) for compensating for the tracking behavior of the instrument (110). Such an instrument (110) is, for example, a medical instrument, such as a drill, a catheter, a scalpel or a scope. These instruments and their surroundings often include metal components. Positioning an EM navigation device, such as a receiver or a transmitter, on the instrument (110) may cause a distortion in the magnetic field which affects the tracking and tracking accuracy. Uses outside medical applications are foreseen, as are tracking systems other than EM tracking systems, such as ultrasound or inertial position.

The invention relates to a code rate control method for extensible video coding, in particular to a prediction mode rate-distortion analysis based code rate control method for extensible video coding, and aims to solve the problem that rate-distortion relation models in the prior code rate control technology cannot describe rate-distortion relations under SVC (scalable video coding) standards, the problem that mutual influences between a basic layer and a reinforcement layer are not considered by existing rate-distortion models and the problem of lack of rate-distortion models for combining the basic layer with the reinforcement layer. The prediction mode rate-distortion analysis based code rate control method includes selecting an optimal coding mode to code a coding unit after valuating a quantization step size, and storing a coding result of the coding unit of the reinforcement layer; calculating gamma j in a jth frame of the basic layer, wherein gamma j=B_MADactual,j-B_MADpredicted,j; updating coefficients a1 and a2, in E_MADj=a1*E_MADj-1+a2+a3*gamma j, of a MAD prediction model; predicting E_MADj of a next coding unit; calculating a target coding bit number Rtxt of the next coding unit after updating RD model coefficients; calculating an interlayer predicted quantization step size and an intra-layer predicted quantization step size until coding of all coding units is completed. The prediction mode rate-distortion analysis based code rate control method is applicable to the field of code rate control of extensible video coding.

A circuit on an integrated circuit is made from a design that is verified using a design tool. The design tool takes a model of the circuit and generates equations with respect to nodes on the circuit. The time consuming task of completely determining the voltage at each node is performed for a predetermined input. To determine the node voltages for other signals, the first order transfer function of the equations is taken and then calculated for the predetermined input. A first order estimate of the node voltages is achieved using this first order transfer function and the node voltages determined from the predetermined input. A second order estimate is achieved using the first order transfer function and the first order estimate. A third order estimate is achieved using the first order transfer function and the second order estimate. The circuit design is verified for manufacturabiltity then manufactured.

A pertubative approach based on the Born approximation resolves weakly nonlinear circuit models without requiring explicit high-order device derivatives. Convergence properties and the relation to Volterra series are discussed. According to the disclosed methods, second and third order intermodulation products (IM2, IM3) and intercept points (IP2, IP3) can be calculated by second and third order Born approximations under weakly nonlinear conditions. A diagrammatic representation of nonlinear interactions is presented. Using this diagrammatic technique, both Volterra series and Born approximations can be constructed in a systematic way. The method is generalized to calculate other high-order nonlinear effects such as IMn (nth order intermodulation product) and IPn (nth order intermodulation intercept point). In general, the equations are developed in harmonic form and can be implemented in both time and frequency domains for analog and RF circuits.

The analysis model generation unit generates an analysis model for use in an analysis by a finite-element method. A stress distortion analysis unit analyzes a stress and a distortion occurring in finite elements of a continuum by a load using the analysis model for each load cycle cyclically applied to the continuum by the finite-element method. An element damage evaluation unit evaluates a damage by the distortion on the finite elements of the continuum based on the analysis result for each load cycle. A crack growth display unit displays the growth of a crack occurring in the continuum based on a result of the evaluation of the damage.

The invention discloses a high-power Loran C pulse transmitter, comprising a signal exciter, wherein an output end of the signal exciter is connected with a power amplifier in series; the power amplifier is connected with a matching filter which is used for matching and filtering pulse signals output by the power amplifier; the matching filter is connected with an antenna tuner; the antenna tuner is used for tuning the signals and transmitting the pulse signals to an antenna; a predistortion unit is arranged in a Loran C modulator and is used for carrying out distortion analysis processing, predistortion processing and waveform generation; and the predistortion unit is also connected with the signal collection unit. The transmitter is mainly applied to a broadcasting subsystem in a long wave time service and Loran C navigation system. Through utilization of a predistortion closed loop processing system, the predistortion processing and dynamic adjustment are carried out on Loran C pulse signals; new and old signal mechanisms are compatible; the signal distortion is effectively reduced; and the performance index of the transmitter is improved.

The invention discloses a rapid time domain analysis method based on a second-order multi-edge response method, and aims to effectively solve a series of problems caused by a non-linear system in maximum distortion analysis. The rapid time domain analysis method comprises the following steps: (1) reading waveform response; (2) processing waveform response; (3) calculating a vector, namely, processing the read waveform response as the vector to be solved; (4) solving the vector, processing the data obtained in a former step into expected data, wherein the step is the core key content of the method; (5) removing a main cursor, and recalculating; (6) acquiring the expected data; (7) acquiring an eye pattern for evaluating the performance of a system. By using the rapid time domain analysis method, the situation in the signal transmission process can be relatively precisely calculated, problems of a conventional method can be avoided, and the problem of signal integrity in practical application can be relatively well solved. The rapid time domain analysis method can be popularized to a relatively high-class multi-edge response method, and thus the multi-edge response method can be systematically used in engineering practice.

In one aspect of this disclosure, rounding adjustments to bi-directional predictive data may be purposely eliminated to provide predictive data that lacks any rounding bias. In this case, rounded and unrounded predictive data may both be considered in a rate-distortion analysis to identify the best data for prediction of a given video block. In another aspect of this disclosure, techniques are described for selecting among default weighted prediction, implicit weighted prediction, and explicit weighted prediction. In this context, techniques are also described for adding offset to prediction data, e.g., using the format of explicit weighted prediction to allow for offsets to predictive data that is otherwise determined by implicit or default weighted prediction.

A method, circuit and system for determining at least one of an amplitude and a relative phase of a signal under test. A reference signal is generated based, at least in part, upon the at least one of the amplitude and the relative phase of the signal under test. The reference signal is combined with the signal under test to generate a residual signal indicative of a distortion within the signal under test. The residual signal is measured.

The invention relates to a geometric distortion automatic analysis method for objectively evaluating a point map of image quality. The method supports automatic complement and search of internal incomplete points, forms a closed loop between the whole target segmentation process and the point map sorting process, achieves the optimization of sorting, and increases the robustness of the distortionanalysis process to the change of the point map segmentation result. Considering that there may be incomplete boundary points in the process of image capturing, which leads to inaccurate position of boundary points in the sorting process, this method adopts the method of region growth to adjust the incomplete boundary points uniformly, which increases the robustness of distortion analysis processto the incomplete degree of boundary points of the point map.

A speaker system featuring automatic volume adjustment to avoid excess distortion includes a first converter for converting an input signal to an input frequency domain signal; and a second converterfor converting a microphone signal to an environmental frequency domain signal. A distortion analyzer receives output of the first and second converter and determines at least one distortion level andprovides at least one gain adjustment signal used to control a corrector to adjust gain of a speaker driver. The system performs a method of reducing distortion by automatically adjusting volume in each of a plurality of frequency bands including converting an input signal to a frequency domain input signal; converting a microphone signal to an environmental frequency domain signal; determining adistortion level; generating a gain adjustment signal; and adjusting gain of a signal provided to a speaker driver.

The invention relates to the technical field of clothing manufacturing, and particularly relates to an intelligent clothing cutting system which comprises a system console, wherein the system consoleis in signal connection with a plurality of intelligent cutting ends; the intelligent cutting ends comprise card reading modules, cutting bed control modules, three-phase power supplies and cutter moving systems; the card reading modules are used for reading typesetting information stored in data cards; the data cards are generated by card issuing and producing equipment; the card reading modulesare in signal connection with the cutting bed control modules; the cutting bed control modules are connected with the three-phase power supplies and the cutter moving systems by wires; and the cuttingbed control modules comprise main controllers. The intelligent clothing cutting system provided by the invention adopts high-definition cameras to sample actual cutting conditions of fabrics, corrects distortion by distortion analysis modules and deformation correction modules, and makes a cutter move according to a predetermined route by pattern recognition modules to ensure alignment of patterns at seams.

Methods for analyzing circuit distortion based on contributions from separate circuit elements are presented. Local approximations that do not require high-order derivatives of device models are developed near an operating point for calculating distortion summaries including compression summaries and second-order intermodulation (IM2) distortion summaries.

The invention discloses a BOC signal digital distortion analysis method under satellite navigation multiplexing modulation. The method comprises the following steps: S100, satellite signals are acquired; S200, a power spectral density function of the satellite signals is solved according to the satellite signals; S300, according to the expression of the power spectral density function of the satellite signals, a power spectral density map of the satellite signals is drawn; S400, based on whether a spike appears on the power spectral density map of the satellite signals, whether digital distortion happens to the satellite signals is judged; and S500, if distortion happens to the satellite signals, a zero-crossing calculation method is adopted to accurately calculate the digital distortion amount of the satellite signals. The distortion condition happening in signals can be effectively and quickly found out, and the distortion amount can be timely and accurately calculated.

The invention discloses an eye exactly perceptible stereo image distortion analyzing method based on texture complexity. From the point of the texture complexity, when an asymmetric stereo image is coded, the maximum quantization parameter coding range of the quality of a right viewpoint image capable of being reduced relative to the quality of a left viewpoint image is analyzed; through a large number of subjective tests, under a condition that the quality of the left viewpoint image is fixed, the critical value of the eye perceptible stereo image change quality of the right viewpoint is measured; the quantitative mathematic model relation among the maximum tolerable quantization parameter threshold value and the texture complexity of the right viewpoint image, and a coding quantization parameter is obtained through linear fitting; the coding compression efficiency can be improved through reducing the quality of the right viewpoint image; moreover, the reduction of the quality of the right viewpoint image cannot be sensed by an observer through a stereo vision masking effect; and therefore, the integral quality of the stereo image is ensured.