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.

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 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.

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 dispersive 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 provides a heating device and plasma processing equipment. The heating device comprises resistance wires, a first base and fixing parts, and the resistance wires are fixed on the first base by the aid of the fixing parts. By the aid of the fixing parts, the resistance wires can be prevented from deviating from preset positions and guaranteed to be uniformly distributed on the first base all the time, and the resistance wires can maintain the same stretch factor, so that heating uniformity of the heating device is improved, and the service life of the heating device is prolonged. The temperature in a reaction chamber of the plasma processing equipment is uniform, and processing quality of processed workpieces can be improved.

The invention relates to a printed board drilling band drawing coefficient data processing method. The printed board comprises a unit plate and a test strip. The data processing method comprises the following steps: 1) On four corners of the test strip, drilling drill holes whose number is one third of a total number of the drill holes as a proportion of 1:1, comparing a hole position deviation so as to calculate a preliminary drilling band drawing coefficient and then executing a step 2; 2) Drilling the drill holes whose number is one third of the total number of the drill holes according to the preliminary drilling band drawing coefficient, comparing the hole position deviation and determining whether the drilling band drawing coefficient accords with a requirement; if the drilling band drawing coefficient accords with the requirement, obtaining the drilling band drawing coefficient; if the drilling band drawing coefficient does not accord with the requirement, executing a step 3; 3) Continuously drilling the residual one third of the drill holes according to the drilling band drawing coefficient of the step 2, comparing the hole position deviation and returning to the step 2. Compared to the prior art, by using the method of the invention, there are the following advantages that cost is saved; the method is visual; a result is accurate and so on.

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.