Showing papers by "Mitsubishi Electric published in 2000"
01 Jul 2000
TL;DR: This work describes one implementation of ADFs, illustrating its utility on two diverse applications: 1) artistic carving of fine detail, and 2) representing and rendering volume data and volumetric effects.
Abstract: Adaptively Sampled Distance Fields (ADFs) are a unifying representation of shape that integrate numerous concepts in computer graphics including the representation of geometry and volume data and a broad range of processing operations such as rendering, sculpting, level-of-detail management, surface offsetting, collision detection, and color gamut correction. Its structure is uncomplicated and direct, but is especially effective for quality reconstruction of complex shapes, e.g., artistic and organic forms, precision parts, volumes, high order functions, and fractals. We characterize one implementation of ADFs, illustrating its utility on two diverse applications: 1) artistic carving of fine detail, and 2) representing and rendering volume data and volumetric effects. Other applications are briefly presented.
730 citations
[...]
TL;DR: This work approaches the problem of stylistic motion synthesis by learning motion patterns from a highly varied set of motion capture sequences, and identifies common choreographic elements across sequences, the different styles in which each element is performed, and a small number of styling degrees of freedom which span the many variations in the dataset.
Abstract: We approach the problem of stylistic motion synthesis by learning motion patterns from a highly varied set of motion capture sequences. Each sequence may have a distinct choreography, performed in a distinct sytle. Learning identifies common choreographic elements across sequences, the different styles in which each element is performed, and a small number of stylistic degrees of freedom which span the many variations in the dataset. The learned model can synthesize novel motion data in any interpolation or extrapolation of styles. For example, it can convert novice ballet motions into the more graceful modern dance of an expert. The model can also be driven by video, by scripts or even by noise to generate new choreography and synthesize virtual motion-capture in many styles.
723 citations
TL;DR: A simple method of replacing costly computation of nonlinear (on-line) Bayesian similarity measures by inexpensive linear subspace projections and simple Euclidean norms is derived, thus resulting in a significant computational speed-up for implementation with very large databases.
660 citations
14 Aug 2000
TL;DR: It is confirmed that Camellia provides strong security against differential and linear cryptanalyses and at least comparable encryption speed in software and hardware.
Abstract: We present a new 128-bit block cipher called Camellia. Camellia supports 128-bit block size and 128-, 192-, and 256-bit keys, i.e., the same interface specifications as the Advanced Encryption Standard (AES). Efficiency on both software and hardware platforms is a remarkable characteristic of Camellia in addition to its high level of security. It is confirmed that Camellia provides strong security against differential and linear cryptanalyses. Compared to the AES finalists, i.e., MARS, RC6, Rijndael, Serpent, and Twofish, Camellia offers at least comparable encryption speed in software and hardware. An optimized implementation of Camellia in assembly language can encrypt on a Pentium III (800MHz) at the rate of more than 276 Mbits per second, which is much faster than the speed of an optimized DES implementation. In addition, a distinguishing feature is its small hardware design. The hardware design, which includes encryption and decryption and key schedule, occupies approximately 11K gates, which is the smallest among all existing 128-bit block ciphers as far as we know.
403 citations
28 Aug 2000
TL;DR: An approach to collaborative filtering based on the Simple Bayesian Classifier, which calculates the similarity between users from negative ratings and positive ratings separately and shows that one of the proposed Bayesian approaches significandy outperforms a correlation-based collaborative filtering algorithm.
Abstract: Many collaborative filtering enabled Web sites that recommend books, CDs, movies, and so on, have become very popular on the Internet. They recommend items to a user based on the opinions of other users with similar tastes. In this paper, we discuss an approach to collaborative filtering based on the Simple Bayesian Classifier. We defme two variants of the recommendation problem for the Simple Bayesian Classifier. In our approach, we calculate the similarity between users from negative ratings and positive ratings separately. We evaluated these algorithms using databases of movie recommendations and joke recommendations. Our empirical results show that one of our proposed Bayesian approaches significandy outperforms a correlation-based collaborative filtering algorithm. The other model outperforms as well although it shows similar performance to the correlation-based approach in some parts of our experiments.
335 citations
Proceedings Article•
01 Jan 2000TL;DR: First, the data is projected into a maximally informative, low-dimensional subspace, suitable for density estimation, and the complicated stochastic relationships between the signals are modeled using a nonparametric density estimator.
Abstract: People can understand complex auditory and visual information, often using one to disambiguate the other. Automated analysis, even at a low-level, faces severe challenges, including the lack of accurate statistical models for the signals, and their high-dimensionality and varied sampling rates. Previous approaches [6] assumed simple parametric models for the joint distribution which, while tractable, cannot capture the complex signal relationships. We learn the joint distribution of the visual and auditory signals using a non-parametric approach. First, we project the data into a maximally informative, low-dimensional subspace, suitable for density estimation. We then model the complicated stochastic relationships between the signals using a nonparametric density estimator. These learned densities allow processing across signal modalities. We demonstrate, on synthetic and real signals, localization in video of the face that is speaking in audio, and, conversely, audio enhancement of a particular speaker selected from the video.
226 citations
01 Jul 2000
TL;DR: It is argued that construction toys, suitably instrumented or sensed, could be the inspiration for a new generation of easy-to-use, tangible modeling systems—especially if the tangible modeling is combined with graphical-interpretation techniques for enhancing nascent models automatically.
Abstract: Construction toys are a superb medium for geometric models. We argue that such toys, suitably instrumented or sensed, could be the inspiration for a new generation of easy-to-use, tangible modeling systems—especially if the tangible modeling is combined with graphical-interpretation techniques for enhancing nascent models automatically. The three key technologies needed to realize this idea are embedded computation, vision-based acquisition, and graphical interpretation. We sample these technologies in the context of two novel modeling systems: physical building blocks that self-describe, interpret, and decorate the structures into which they are assembled; and a system for scanning, interpreting, and animating clay figures.
191 citations
TL;DR: An improved algorithm for estimating pulse repetition intervals (PRIs) of an interleaved pulse train which consists of several independent radar signals with different PRIs is presented, which enables detection of mean PRIs by thresholding.
Abstract: This paper presents an improved algorithm for estimating pulse repetition intervals (PRIs) of an interleaved pulse train which consists of several independent radar signals with different PRIs. The original version of this algorithm is a complex-valued autocorrelation-like integral, which leads to a kind of PRI spectrum wherein the locations of the spectral peaks indicate the PRI values. The original algorithm, however, has a serious drawback in that it is vulnerable to timing jitter (PRI jitter). We analyze the cause of this vulnerability and propose an improved algorithm using overlapped PRI bins which have shifting time origins. The improved algorithm has proven to be quite effective in obtaining the PRI spectrum for jittered pulse trains, which enables detection of mean PRIs by thresholding.
167 citations
Patent•
[...]
TL;DR: In this article, a vehicle AC generator that further enhances safety at the time of a vehicle collision, without resorting to changes in material or changes in overall thickness, is presented, where a partitioning section is integrally formed on the inner side of the resin cover.
Abstract: Provided is a vehicle AC generator that further enhances safety at the time of a vehicle collision, without resorting to changes in material or changes in overall thickness. A vehicle AC generator 50 has: a rotor 5 provided on a shaft 4; a stator 10 disposed so as to oppose the rotor; a rectifier 12 rectifying current generated in the stator; a regulator 13 adjusting voltage generated in the stator; and a resin cover 14 covering the rectifier. A partitioning section 15 is integrally formed on the inner side of the resin cover. The partitioning section extends in the peripheral direction and rises in the axial direction of the shaft.
144 citations
TL;DR: In this article, a technique for minimizing the detent force using the finite element method is described, which is based on the phase difference between the two magnetic forces arising at both side edges of a stator core.
Abstract: This paper describes a technique for minimizing the detent force using the finite element method. The detent force of the whole stator core is the total of two magnetic forces arising at both side edges of a stator core. Computed results show the phase difference between the two magnetic forces. Therefore, we can cancel out the two forces by adjusting a stator length to minimize the detent force. The stator with the smooth formed edge shape is also contrived to reduce the detent force in the practical use. The detent force of this model is successfully minimized by proposed method.
142 citations
01 Nov 2000
TL;DR: In this paper, a perturbation and observation method with a capacitor identifier is presented for maximum power point tracking (MPPT) in a photovoltaic power system, where the model reference adaptive system is adapted to identify the capacitor, so the capacitance can be accurately estimated and the variation of the duty ratio can be corrected by the estimated value.
Abstract: A perturbation and observation method with a capacitor identifier is presented for maximum power point tracking (MPPT) in a photovoltaic power system. Usually, by increasing or decreasing the duty ratio of on-state of switching device, the maximum power point is tracked. The variation of duty ratio is determined by considering its circuit parameters. However, it is known that actual capacitance of an electrolytic capacitor in parallel with the photovoltaic array has 50% tolerance of its nominal value. If the variation of duty ratio is determined based on its nominal value, the performance of the MPPT is degraded. Thus, we must change the variation of the duty ratio accordingly, based on its actual value. In the system presented, the model reference adaptive system is adapted to identify the capacitor, so the capacitance can be accurately estimated and the variation of the duty ratio can be corrected by the estimated value. As a result, the high performance of the MPPT may be obtained. Experimental results are presented using a proposed power inverter using buck-boost chopper circuits.
TL;DR: The first report of a PC‐based simulator that incorporates synthetic fluoroscopy, real‐time three‐dimensional interactive anatomic display, and selective right‐ and left‐sided coronary catheterization and angiography using actual catheters is presented.
Abstract: Interventional cardiology training traditionally involves one-on-one experience following a master-apprentice model, much as other procedural disciplines. Development of a realistic computer-based training system that includes hand-eye coordination, catheter and guide wire choices, three-dimensional anatomic representations, and an integrated learning system is desirable, in order to permit learning to occur safely, without putting patients at risk. Here we present the first report of a PC-based simulator that incorporates synthetic fluoroscopy, real-time three-dimensional interactive anatomic display, and selective right- and left-sided coronary catheterization and angiography using actual catheters. Significant learning components also are integrated into the simulator.
TL;DR: In this paper, the relationship between the geometrical size and the resonant frequency of the meander line dipole antenna was investigated and a calculation formula for the radiative efficiency was derived from the result.
Abstract: One of the approaches to reducing the size of half-wavelength linear dipole antennas is the meander dipole antenna, where the elements form a meander line. This paper presents a formula for the relationship between the geometrical size and the resonant frequency of the meander line dipole antenna, and a calculation formula for the radiative efficiency is derived from the result. It is shown that the geometrical parameters of the meander line dipole antenna can be determined from the specified radiative efficiency. © 1999 Scripta Technica, Electron Comm Jpn Pt 2, 83(1): 52–58, 2000
Patent•
11 Apr 2000TL;DR: In this article, a classifier is coupled to receive an input compressed video and the constraints, and the classifier generates content information from features of the input compressed videos, and a manager produces a plurality of conversions modes dependent the constraints and content information.
Abstract: In an apparatus for transcoding a compressed video, a generator simulates constraints of a network and constraints of a user device. A classifier is coupled to receive an input compressed video and the constraints. The classifier generates content information from features of the input compressed video. A manager produces a plurality of conversions modes dependent the constraints and content information, and a transcoder produces output compressed videos, one for each of the plurality conversion modes.
TL;DR: The laser employs a diffusive close-coupled diode-pumping design and a bifocusing-compensation resonator design to ensure stable operation and generates green power and beam quality at an estimated beam quality of M(2) = 11.
Abstract: Green power of 138 W was generated at an estimated beam quality of M2=11 by intracavity frequency doubling of a diode-pumped Nd:YAG laser. The laser employs a diffusive close-coupled diode-pumping design and a bifocusing-compensation resonator design to ensure stable operation.
TL;DR: This power is, to the authors' knowledge, the highest UV power achieved so far in all-solid-state lasers.
Abstract: We have obtained UV power of 20.5 W with a repetition rate of 10 kHz by the use of a high-brightness high-power all-solid-state green laser and a high-quality CsLiB6O10 crystal. This power is, to our knowledge, the highest UV power achieved so far in all-solid-state lasers.
TL;DR: In this article, the authors describe the theoretical and experimental study of a new technique for optical frequency domain ranging (OFDR) by a frequency-shifted feedback (FSF) laser.
Abstract: This paper describes the theoretical and experimental study of a new technique for optical frequency domain ranging (OFDR) by a frequency-shifted feedback (FSF) laser. In conventional OFDR, a frequency chirped single-mode laser is used as a light source to convert a distance into a beat frequency, and a tradeoff exists between measurement range and resolution. The FSF laser output consists of periodically generated chirped frequency components whose chirp rate is faster than 100 PHz/s (P=10/sup 15/), By use of the FSF laser, the tradeoff is removed and long-distance high-resolution OFDR is realized In the experiment, a distance of 18.5 km was measured with a resolution of 20 mm.
Patent•
20 Apr 2000TL;DR: In this article, a method for configuring a telecommunications system including a plurality of entities communicating data via plurality of transport channels is presented. But it does not consider the transmission of a parameter representing a maximum puncture rate.
Abstract: A method for configuring a telecommunications system including a plurality of entities communicating data via a plurality of transport channels. The entities inlclude at least one sending entity and receiving entity. The communication includes a plurality of processing procedures specific to the plurality of transport channels. Each processing procedure includes a rate matching step including a transformation of an input block of an initial size into an output block of a final size by puncturing and/or repetition. The method includes transmitting a parameter representative of a maximum puncture rate. The method also includes calculating by the sending entity, for each processing procedure, the final size of the output block as a function of the initial size of the input block based on the parameter transmitted. Some input block bits are punctured or repeated based on a variation between a final size and an initial size in the rate matching step.
01 Dec 2000
TL;DR: A background subtraction method that robustly handles various changes in the background using a multi-dimensional image vector space and introduces an eigenspace to reduce the computational cost.
Abstract: Background subtraction is a useful and effective method for detecting moving objects in video images. Since this method assumes that image variations are caused only by moving objects (i.e., the background scene is assumed to be stationary), however, its applicability is limited. In this paper, we propose a background subtraction method that robustly handles various changes in the background. The method learns the chronological changes in the observed scene's background in terms of distributions of image vectors. The method operates the subtraction by evaluating the Mahalanobis distances between the averages of such image vectors and newly observed image vectors. The method we propose herein expresses actual changes in the background using a multi-dimensional image vector space. This enables the method to detect objects with the correct sensitivity. We also introduce an eigenspace to reduce the computational cost. We describe herein how approximate Mahalanobis distances are obtained in this eigenspace. In our experiments, we confirmed the proposed method's effectiveness for real world scenes.
Patent•
01 May 2000TL;DR: In this article, a dual function is used to allow a satellite single mobile station, position-registered in a satellite system via a satellite, to receive signals by way of a satellite exchange.
Abstract: When a cellular mobile station (15) position-registered in a ground system (11) is requested to receive signals, and when the cellular mobile station (15) cannot receive signals via a ground exchange (9) in a mobile radio communication network (10), a dual function is used to allow a satellite single mobile station (16), position-registered in a satellite system (6) via a satellite (2), to receive signals by way of a satellite exchange (4) in a satellite communication network (5).
TL;DR: In this paper, a new texturization technique for crystalline silicon solar cells with sodium carbonate (Na2CO3) solutions was investigated. But the authors only considered the hemispherical surface reflectance.
Patent•
31 Mar 2000TL;DR: In this paper, a destination computer reads a device identification and a network address from a peripheral device connected to the destination computer, and a device driver, corresponding to the device identification, is then retrieved from the source computer at the network address.
Abstract: A destination computer reads a device identification and a network address from a peripheral device connected to the destination computer. A device driver, corresponding to the device identification, is then retrieved from the source computer at the network address. A device driver installation program can also be retrieved from the source computer. The device driver installation program is executed in the destination computer to determine the configuration of the destination computer. The destination computer requests the device driver for the peripheral device corresponding to the configuration of the destination computer from the source computer. The device driver is installed in the destination computer.
TL;DR: In this article, the authors presented novel types of polarizers that are composed of grooved circular waveguides, which are suitable for realizing highperformance and low-fabrication cost in the Ka-band and above.
Abstract: This paper presents novel types of polarizers that are composed of grooved circular waveguides. The presented polarizers are suitable for realizing high-performance and low-fabrication cost in the Ka-band and above because of simple structure. Accurate analysis and design of the polarizers are performed using full-wave mode-matching techniques applied to the circular-to-rectangular waveguide T-junctions and cross-junctions. Ka-band grooved circular waveguide polarizers fabricated with the aid of the analysis and design techniques have realized excellent performance without tuning elements.
Patent•
06 Jul 2000TL;DR: In this article, a method for extracting high-level features from a video including a sequence of frames is proposed, where each frame of the video is labeled according to the extracted lowlevel features to generate sequences of labels.
Abstract: A method extracts high-level features from a video including a sequence of frames. Low-level features are extracted from each frame of the video. Each frame of the video is labeled according to the extracted low-level features to generate sequences of labels. Each sequence of labels is associated with one of the extracted low-level feature. The sequences of labels are analyzed using learning machine learning techniques to extract high-level features of the video.
Patent•
11 Apr 2000TL;DR: In this paper, a method for transcoding a compressed video partitions the compressed video into hierarchical levels, and extracts features from each of the hierarchical levels. One of a number of conversion modes of a transcoder is selected dependent on the features extracted from the hierarchical layers. The compressed video is then transcoded according to the selected conversion mode.
Abstract: A method for transcoding a compressed video partitions the compressed video into hierarchical levels, and extracts features from each of the hierarchical levels. One of a number of conversion modes of a transcoder is selected dependent on the features extracted from the hierarchical levels. The compressed video is then transcoded according to the selected conversion mode.
TL;DR: In this article, the electronic odors emanating from "La France" pears were examined by the electronic odor detection system based on the adsorption on to and subsequent desorption of volatile compounds from an array of semi-conducting polymers.
11 Jun 2000
TL;DR: In this paper, the best tuning that exhibits the highest efficiency has been found to move from class-F to inverse-class-F in accordance with larger gain-compression, higher load resistance and smaller Ron.
Abstract: Class-F: the 2nd harmonic is short and the 3rd harmonic is open, inverse class-F: the 3rd one is short and the 2nd one is open, and intermediate harmonic tunings are analyzed by simulations. The best tuning that exhibits the highest efficiency has been found to move from class-F to inverse class-F in accordance with larger gain-compression, higher load resistance and smaller Ron. The Ron dependence of the efficiency is also described by using a waveform theory.
Patent•
18 Dec 2000TL;DR: In this article, a landscape-type memory cell MC with 8-row and 256-column layout is used to provide a fast static semiconductor storage device with a small layout area, where a single wiring is required per a single memory cell row, resulting in a smaller layout area and faster operation speed.
Abstract: PROBLEM TO BE SOLVED: To provide a fast static semiconductor storage device with a small layout area SOLUTION: A global word line GWL, a bit line load power-source wiring BVL, a local data input/output line pair LIO /LIO, a bit line signal input/output line pair BL'/BL', and a memory cell power-source wiring MVL and global column selecting line GYL, eight wirings in total, are arranged with constant intervals above a memory block MB comprising a landscape-type memory cell MC with 8-row and 256-column Since a single wiring is required per a single memory cell row, an SRAM of T-type bit line structure is easily configured using the landscape-type memory cell MC, resulting in a smaller layout area and faster operation speed
TL;DR: A new descriptor for spatial distribution of motion activity in video sequences is presented, which is a low-level non-semantic descriptor that gives semantic matches within the same program, and is thus very suitable for applications such as video program browsing.
Abstract: A method describes motion activity in a video sequence. A motion activity matrix is determined for the video sequence. A threshold for the motion activity matrix is determined. Connected regions of motion vectors at least equal to the threshold are identified and measured for size. A histogram of the distribution of the sizes of the connected areas is constructed for the entire video sequence. The histogram is normalized to characterize the spatial distribution of the video sequence in a motion activity descriptor.
TL;DR: In this paper, a thin-film spiral inductor with micropatterned Fe-Al-O and CoNbZr films for the impedance matching elements in 1GHz-drive mobile communication handset application has been demonstrated.