35 results about "Stretch factor" patented technology

The invention provides a method and apparatus for identifying gestures performed by a user to control an interactive display. The gestures are identified based on a bounding box enclosing the points at which a user contacts a touch sensor corresponding with the display surface. The invention thus permits the use of inexpensive and highly reliable grid-based touch sensors that provide a bounding box to describe contact information. In identifying the gestures, the position, motion, shape, and deformation of the bounding box may all be considered. In particular, the center, width, height, aspect ratio, length of the diagonal, and orientation of the diagonal of the bounding box may be determined. A stretch factor, defined as the maximum of the ratio of the height of the bounding box to the width of the bounding box and the ratio of the width of the bounding box to the height of the bounding box, may also be computed. Finally, gestures may be identified based on the changes in time of these characteristics and quantities.

A computer-implemented method of accounting for angle-dependent wavelet stretch in seismic data based on a novel relationship between wavelet stretch and the cosine of a reflection angle of an acoustic ray. Conventional seismic data having at least one wavelet, such as data generated from a reflection seismic survey, is accessed. The data is processed such that at least one wavelet is subject to angle-dependent wavelet stretch. A reflection angle for at least one wavelet is also determined. An operator is utilized to calculate a wavelet stretch factor for at least one wavelet based on the cosine of the corresponding reflection angle of the wavelet. The wavelet stretch factor is applied to the seismic data to account for angle-dependent wavelet stretch.

Aspects of a system and method for processing an image are presented. The method may comprise stretching contrast of an input image based on a distribution of luma values for the input image and a distribution of luma values for a desired output image. The pixels below a specified level of contrast defined by the distribution of luma values for the input image and the distribution of luma values for the desired output image are substantially stretched. The method may also comprise constructing a lookup table of the desired output luma values and stretching a contrast of the input image using the constructed lookup table. The method may also comprise applying linear function and a non-linear function to the distribution of luma values, and applying a stretch factor above a specified level of the distribution and a stretch factor below a specified level of the distribution.

The present invention provides a method and apparatus for arriving at true relative amplitude destretched seismic traces from stretched seismic traces. The method compensates for offset varying reflection interference effects due to normal moveout. Stretch factors β and also input spectra are determined for NMOR stretched seismic traces. Estimates are then made of stretched wavelet spectra from the input spectra. A destretched wavelet spectra is then obtained. Shaping correction factors are determined by taking the ratio of the destretched wavelet spectra to the stretched wavelet spectra and are applied to the input spectra of the stretched traces to arrive at a destretched trace spectra. True relative amplitude scaling factors are computed by taking the ratio of a true relative amplitude property of the destretched wavelet spectra to a corresponding true relative amplitude property of the stretched wavelet spectra. Finally, the true relative amplitude scaling factors are applied to the destretched trace spectra to arrive at true relative amplitude destretched seismic traces.

Systems and methods are provided for ultrafast optical waveform sampling based on temporal stretching of an input signal waveform. Temporal stretching is performed using a time lens based on four-wave mixing in a nonlinear medium. The signal is passed through an input dispersive element. The dispersed signal is sent into the time lens, which comprises a chirped pump pulse and a nonlinear medium. The chirped pump pulse is combined with the signal. The four-wave mixing process occurs in the nonlinear device or medium, which results in the generation of a signal at a new optical frequency (idler). The idler is spectrally separated from the signal and pump pulse using a bandpass filter and sent into an output dispersive element. The output dis persive element is longer than the input dispersive element and the temporal stretching factor is given by the ratio between the dispersions of these two elements.

The invention discloses an assisted power controlling method for an electric power assisted steering system. The method includes the steps that a microprogrammed control unit (MCU) collects a torque signal and a vehicle speed signal of a steering wheel to calculate to obtain power assisted motor target electric current Im of the power assisted steering system and meanwhile, collects current actual electric current Ireal of a power assisted motor; stretch factors alpha (e) and alpha (ec) of an input domain and stretch factors Beta (e, ec) of an output domain are obtained by the aid of control thoughts of a varying domain and a functional expression; a fuzzy control unit is combined with stretch factors of the varying domain to obtain control parameter modification values delta Kp and delta Ki through fuzzy reasoning; the calculation is performed to obtain an incremental value of a duty ratio of pulse-width modulation (PWM) by an incremental PI algorithm, and the motor is controlled in a PWM driving mode to output power assisted torque. By means of the assisted power controlling method for the electric power assisted steering system, defects such as nonlinearity and multiple coupling of the electric power assisted steering system can be effectively overcome by the established fuzzy control strategy, the stretch factors can adjust the domains in an on-line mode, and adaptive ability and control accuracy of the system are improved.

A method for photocopying an original color document reduces the amount of color in the resulting photocopy. This is accomplished by scanning bands of the original document to create image bands, detecting a background color in one or more margins of the document that are within the scanned image bands, determining a stretch factor based on the color in the margins, and then scaling pixel values of the pixels by the stretch factor. The stretch factor may be established in one space, e.g., luminance space, and the scaling may be performed in another space, e.g., RGB, though this is not an absolute requirement. A device capable of performing the foregoing thereby reduces the amount of color ink or color toner consumed when the color background of an original document is not needed in the photocopy.

According to a quasi-cyclic low density parity check code basis matrix construction method, node distribution acquired through optimization of a density evolution algorithm is used, then a stretch factor Z is set, the circle length of the LDPC code check matrix and external message scale of the circle are jointed optimized, finally, a QC-LDPC code basis matrix with excellent performances is generated through extension. Each element in the basis matrix is corresponding to one Z*Z dimensional all-zero matrix, a unit matrix or a cyclic shift matrix of the unit matrix. But in construction of high code rate QC-LDPC code, the contradiction of limitation of matrix row number and maximum line number usually occurs, namely, the maximum line number is greater than the row number. To solve the problem, the invention provides construction of the basis matrix through a method increasing line number through superposition of a plurality of cyclic shift matrixes, namely, multiple cyclic shift matrixes are embedded in a single block matrix. The "superposition" operation is binary addition, the constructed basis matrix not only guarantees the cycle performance of the QC-LDPC code, but also meets the requirement of optimization of codon performance through increase of minimum code distance.

The present document relates to audio source coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR), as well as to digital effect processors, e.g. exciters, where generation of harmonic distortion add brightness to the processed signal, and to time stretchers where a signal duration is prolonged with maintained spectral content. A system and method configured to generate a time stretched and/or frequency transposed signal from an input signal is described. The system comprises an analysis filterbank (101) configured to provide an analysis subband signal from the input signal; wherein the analysis subband signal comprises a plurality of complex valued analysis samples, each having a phase and a magnitude. Furthermore, the system comprises a subband processing unit (102) configured to determine a synthesis subband signal from the analysis subband signal using a subband transposition factor Q and a subband stretch factor 5″. The subband processing unit (102) performs a block based nonlinear processing wherein the magnitude of samples of the synthesis subband signal are determined from the magnitude of corresponding samples of the analysis subband signal and a predetermined sample of the analysis subband signal. In addition, the system comprises a synthesis filterbank (103) configured to generate the time stretched and/or frequency transposed signal from the synthesis subband signal.

The invention provides a method and device for implementing load balance, wherein when a first node overloads, multiple virtual links are selected between the first node and a second node are selected to transmit a service stream to the second node for complete process, and the method for implementing load balance can be used for implementing effective load balance on the multiple virtual links, such as implementation of effective load balance considering a stretch factor and a weight factor. The method for implementing load balance is mainly intended to process the first node for load balance for the service loaded by the virtual links when links are added or cancelled, to use the the new virtual links to load and share the link with currently heaviest load when the virtual links are added, to select the link with lightest load to load the service loaded by the cancelled links when the links are cancelled, and more important to act maximumly without affecting the primary service stream when the virtual links are added or cancelled. Particularly, expandable virtual links and the service weight factor can be used for optimizing load balance based on the service.

A knitted-in band for terminating a raw edge of footless pantyhose has a stretch factor and a thickness for the leg band and a stretch factor and a thickness for the leg portion. The stretch factor of the leg band is approximately equal to the stretch factor of the leg portion and the thickness of the leg band is approximately equal to the thickness of the leg portion.

The invention discloses a brand new fully-linear analog multicast method without error correction protection. The method comprises the following steps: performing de-correlation transformation, L shape-based partition and data stretching, whitening transformation and group of pictures (GoP) based interleaving on multimedia data at a transmitting end, and transmitting the multimedia data through a linear modulation wireless communication channel without error correction protection; and performing de-interleaving, anti-whitening, stretching factor estimation based on received data, fitting-based correction factor model correction, reverse drawing and reverse de-correlation transformation on the received data at a receiving end. The method can have the advantages that (1) the fairness is excellent; (2) the 'cliff effect' in metadata transmission does not exist, and better robustness and a longer transmission distance are achieved; (3) digital sideways are avoided, and the computation complexity and memory overhead are lowered; (4) metadata transmission is not required, and the bandwidth occupation is reduced; and (5) better image quality is achieved in a circuit with a high packet loss rate.

The invention discloses a topology control method for effectively reducing a construction expenditure based on a wireless lossy network. Any network node u in the wireless lossy network performs the following steps of (1) setting a stretch factor t of the wireless lossy network according to user demands; (2) acquiring a maximum transmitting power link data set TABmaxu of the node u; (3) altering a transmitting power broadcasting explorer packet of the node u; (4) initializing an adjacent link data set H of the node u and a shortest path set PATH as null; (5) acquiring a current transmitting power link data set TABku; (6) updating the adjacent link data set H; (7) updating the shortest path set PATH; and (8) sequentially seeking an alternative path for each link from the shortest path set obtained in step (7) so as to determine the transmitting power of the node u in the wireless lossy network. According to the topology control method, the topology construction communication expenditure and time consumption in the wireless lossy network environment are effectively reduced and meanwhile the average transmitting power level is effectively reduced.

The invention discloses an upper and low limit accurate estimation and framework determination method for a discretized wavelet transformation family. The method comprises the following steps: step 01: a user collects data while setting a discretized wavelet family; step 02: according to the set scale stretch factor discretization parameter a0, discretizing the frequency f within the range from 1to a0 in order to obtain a series of discretized frequency values f; step 03: using conventional method within the frequency domain to estimate in order to obtain an upper Aold and a lower Bold for the discretized wavelet transformation family; step 04: using a novel method within the frequency domain to estimate in order to obtain an upper limit Anew and a lower limit Bnew for the discretized wavelet transformation family; step 05: obtaining an upper limit A and a lower limit B for the discretized wavelet transformation family by integrating Aold, Bold, Anew and Bnew; step 06: determining whether the discretized wavelet transformation family can form a wavelet framework or not; and step 07: if so, utilizing the framework to carry out data processing. The upper and low limit accurate estimation and framework determination method can be used for determining whether the discretized wavelet transformation family can form the wavelet framework or not and whether the discretized wavelet transformation family can be used for data processing. Meanwhile, the method is featured by being simple in implementation, easy in operation and broad in application scope.

A technique for image alignment with global translation and linear stretch determines translation parameters for three corresponding linearly displaced blocks in a reference image and a corresponding distorted test image. From the differences between the translation parameters for the three blocks the presence of stretch is detected and, if detected, a stretch factor is estimated. The estimated stretch factor is used as a starting point to stretch the reference image to overlap the distorted test image as a refinement process. The resulting refined stretch factor is then used in a reverse stretch process to shrink the distorted test image, and the distorted test image is then aligned with the reference image to obtain picture quality metrics. <IMAGE> <IMAGE>