IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 119 , Issue 1
Showing 1-18 articles out of 18 articles from the selected issue
  • Mikio Takagi
    1999 Volume 119 Issue 1 Pages 1
    Published: January 01, 1999
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Hiroyasu Koshimizu, Seiji Hata
    1999 Volume 119 Issue 1 Pages 2-7
    Published: January 01, 1999
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Fumihiko Saitoh
    1999 Volume 119 Issue 1 Pages 8-13
    Published: January 01, 1999
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper proposes a method to inspect forms of solder bumps located on the surface of a semiconductor bare chip. The form of a solder bump is inspected by evaluating the two-dimensional features observed from the vertical view and by measuring the change of the optical focus on the surface of the solder bump when the Z-stage is moved once using the vertical coaxial illumination and the dome-typed uniform illumination. As the experimental result, the method for measuring the focus on the surface of the solder bump which evaluates the summary of differential brightness by the Prewitt operator had the best performance. Also, the detection rate of defective solder bumps reached 95.6% and the inspection time was 0.3 second to a solder bump.
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  • Toshikazu Onda, Makoto Niwakawa, Nobuyuki Fujiwara, Ayako Seike
    1999 Volume 119 Issue 1 Pages 14-20
    Published: January 01, 1999
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    We have focuced to the model based matching technique to detect and locate casting parts in the image. To accomplish this, we have explored the edge based optimized feature extraction procedure and feature based model matching technique for object recognition, so that we have realized a practical visual positioning system for castings. Our system is insensitive to changes in lightings or backgrounds in the real works. In this paper, the system, experiments and some applications are described.
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  • Takahiro WATANABE, Kuniteru SAKAKIBARA, Masahiko YACHIDA
    1999 Volume 119 Issue 1 Pages 21-29
    Published: January 01, 1999
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper describes a real time gesture recognition method for interactive systems. Our method can recognize gesture robustly in a variety of real complex environments. For the robust gesture recognition, our method performs an interactive model generation before the recognition processing, and an individual gesture model is constructed by the interaction between a user and the computer. The individual gesture model is based on the template matching technique and it is constituted by the set of color template images which represent a set of specific poses of human part in a gesture. Using our method, we realize a real time interactive system, the Gesture Game System, which can activate the characters of video game by gestures in real-time and indicates the usefulness of our method.
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  • Du-Yih Tsai
    1999 Volume 119 Issue 1 Pages 30-36
    Published: January 01, 1999
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper describes a method for optimizing the parameters of fuzzy rules using genetic algorithms (GAs) for classification of myocardial heart disease from ultrasonic images. Gaussian-distributed membership functions (GDMFs) constructed from the texture features inherent in the ultrasound images are used, and the coefficients acted as a set of parameters to adjust the magnitudes of the standard deviations of the GDMFs are employed. Optimal coefficients are determined through training process using the GA. The GA-based fuzzy classifier is used to discriminate two sets of echocardiographic images, namely, normal case (23 samples) and abnormal case (22 samples), diagnosed by a highly trained physician. The results of our experiments are very promising. In the best case, we achieve a classification rate of 95.8%. The results indicate that the method has potential utility for computer-aided diagnosis of myocardial heart disease.
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  • Kenji Terada, Rikiko Yamanaka, Shun'ichiro Oe
    1999 Volume 119 Issue 1 Pages 37-43
    Published: January 01, 1999
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In this paper, we propose a method for recognizing phoneme by using a sequence of color lip images. The mouth images are obtained in series by using the color camera set at the front of the face. First, among the sequence of the images, each object image for processing is detected by using mouth movement information. Next step, in each image, the mouth region is detected by the color information. Then, the four shapes which are outside line of lip, the inside line of lip, the tangue and the center line of lip are extracted by using the change in distribution of gray level. Finally, the recognition of phoneme is carried out by the method based on the subspace method. As the training, the subspace method needs the 20 features extracted from the above four shapes. In this paper, the authors describe the results of the experiments which were performed to demonstrate the effectiveness of the proposed method.
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  • Hideki Tanahashi, Kazuhiko Yamamoto, Kunihito Kato
    1999 Volume 119 Issue 1 Pages 44-49
    Published: January 01, 1999
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In this paper, we propose a method for recovering shape descriptions of three-dimensional object from range image by using genetic algorithm (GA). Two superquadrics models have been employed for description of a 3D shape. The model parameters, which defined the shape, are obtained at the same time without using the division method. The fitting energy evaluated the difference in both depth from the object center and the distribution of the normal vector between input range image and the model surfaces. As a result, the experiment demonstrates that the three-dimensional object was reconstructed from both artificial and measured range data.
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  • Zhencheng Hu, Keiichi Uchimura, Shigeyasu Kawaji
    1999 Volume 119 Issue 1 Pages 50-57
    Published: January 01, 1999
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Camera's motion parameters play a vital role in the research of autonomous vehicle's vision navigation and dynamic image sequences analysis. We propose here a fast motion parameters' estimation method with the use of stationary camera's Focus of Expansion (FOE). Contrary to general methods like using optical flow and feature matching, our approach is able to determine camera's rotation and translation parameters by using only 3 pairs of matching points. A fast matching algorithm of feature points extracted by color gradient edge detector (CGD) and localized contour sequences (LCS) is also presented in this paper. Experiments on image sequences of synthetic and real road scenes showed the of fectiveness and precision of our approach.
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  • Kunihito Kato, Toshio Endo, Kazuhito Murakami, Takashi Toriu, Hiroyasu ...
    1999 Volume 119 Issue 1 Pages 58-66
    Published: January 01, 1999
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Line detection using Hough transform is one of the robust image processing methods for noisy image. But Hough transform has a problem whose computation cost is very large. In order to ease this problem, many high-speed algorithms were proposed.
    Xu and Oja proposed RHT (Randomized Hough Transform) which reduces the computation cost by selecting the pair of the edge points at random. On the other hand, D. Ben-Tzvi and M. B. Sandler proposed CHT (Combinatorial Hough Transform) which reduces by dividing the image to some blocks and by limiting the combination of the pairs of the edge points in these blocks.
    In this paper, we propose a new high-speed algorithm called MRHT (Multiply Randomized Hough Transform) which combines randomized edge point selection process on RHT and block division process on CHT. MRHT has two randomized selection processes. First process is randomized selection from the divided blocks at random. In second process, MRHT selects the pair of the edge points at random in the selected block in the previous selection. Thus, MRHT has multiply randomized selection process in two steps.
    In CHT algorithm, we have to make the sacrifice of the quality of the detected lines, because we divide the image to many blocks to reduce the computation cost. Experimental and theoretical considerations revealed that MRHT becomes faster than CHT even in a low division rate, and that MRHT can provide almost the same quality of the detected lines 56 times faster than RHT.
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  • Kyouji Tanaka, Yoshiaki Shirai
    1999 Volume 119 Issue 1 Pages 67-74
    Published: January 01, 1999
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    We describe classification into overall quality of objects produced in groups, corresponding with the surface appearance of the objects in non-uniform texture images. A method applied with a hierarchy by the Wavelet transform and a neural network (NN) is proposed. This method does not require mechanical picking or arranging before taking images, because the method directly uses an image of overlaping objects in the producing.
    Reliable regions for classification are discriminated from unreliable regions using spatial localization of the Wavelet hierarchy through the reconstruction. Useful components for classification are extracted from the regions using frequency decomposition of the hierarchy. Wavelet channels (frequency bands) for the extraction are optimized in order that a brightness histgram from the extracted components can reflect difficulty according to classes. NN learns classification using the histgram based on judgment of a human expert, and yield an overall quality class of the whole image.
    Experimental results prove practicality of the proposed method in the classification performance and in the processing speed.
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  • Naonori Ohno, Yoshinori Niwa
    1999 Volume 119 Issue 1 Pages 75-80
    Published: January 01, 1999
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper presents a system to convert range data to 3D CAD data by the operator's interaction in 3D Virtual Space. Recently, although many researches have been done, it is difficult to obtain exact shapes for 3D CAD systems. Also, there are systems for the purpose by the operator. However, since using displays and pointing devices for 2D in them, the operator cannot operate on range data easily. To solve such problems, the authors utilize Virtual Reality Technology for converting range data to 3D CAD data, and have developed a prototype system for it. This system provides a suitable interface to select a part of range data and generate geometric shapes by using a stereoscopic display, 3D pointing device and various template cursors. In addition, by applying methods of pattern recognition to the selected points, we can obtain 3D CAD data efficiently and exactly. As a result of the experiments, this system can generates 3D shapes from range data, and its effectiveness is confirmed.
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  • Yasushi Morita, Toru Fujisawa, Tatsuo Tani
    1999 Volume 119 Issue 1 Pages 81-87
    Published: January 01, 1999
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Photovoltaic/thermal hybrid panel is a high efficient energy converter which supplies electrical energy and thermal energy from solar energy. In this paper, we clarified characteristics of two types of PV/Ts' change by means of environment condition and fluid flow rate, using numerical analysis. As a result, photovoltaic efficiencies came to 9.61%in PV/TA, 10.56%in PV/TB respectively at Tc=25°C, and thermal ones 52.11%in PV/TA, 40.14%in PV/TB respectively at Tl=40°C, Irr=800W/m2. From this result, we propose some design points to construct the optimum structure of PV/T. Next, we adopted exergetic evaluation to evaluate electrical energy and thermal energy quantitatively. As a result, we could confirm the existence of flow rate maximizing the total efficiency (say optimum flow rate) on some environment condition, and could define the optimum operating condition. Moreover we compare exergetic efficiencies on optimum operating conditions (say max. exergetic efficiency) under various environment conditions with PV and PV/TA and PV/TB. A rise of max. exergetic efficiency to increasing irradiance came to -3.6%/kW•m-2, +3.6%/kW•m-2, +1.4%/kW•m-2 respectively. Nevertheless we could confirm a hybrid-izing merit to high irradiance.
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  • Kiyoshi Ohishi, Tomonori Mashimo
    1999 Volume 119 Issue 1 Pages 88-96
    Published: January 01, 1999
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    When a robust servo system having an integral element has a large error input, it often has the windup phenomena caused by output saturation. It is very difficult for a strictly proper and high order controller to avoid having the windup phenomena caused by output saturation. This paper newly proposes the digital robust speed servo system with the complete consideration algorithm of output saturation. The proposed algorithm completely considers the output saturation of robust speed controller connected to PI current controller in series. Moreover, this method can apply to both PI speed controller and H speed controller. The experimental results show that the robust speed servo system having the proposed algorithm has a good and stable response for a large step speed command.
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  • Shu YAMAMOTO, Takahiro ARA, Shoichi ODA
    1999 Volume 119 Issue 1 Pages 97-102
    Published: January 01, 1999
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper presents a method for identifying equivalent circuit constants for double squirrel-cage induction motors. The proposed strategy is based on a standstill response testing method using a small capacity DC power supply unit, and identifies equivalent circuit constants that accord with the construction of double squirrel-cage induction motors, using characteristics of the rotor-side equivalent circuit constants as inferred from the slot shape of the double squirrel-cage rotor. The proposed method is applied to a 5.5kW-200V-22A-4P-50Hz induction motor with a semi-closed double squirrel-cage rotor. The accuracy and validity of the proposed method are evaluated by comparing the results on starting performance (torque-slip and current-slip characteristics) measured by an on-load test and those predicted by the proposed method.
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  • Kenichiro Fujiwara, Hiroshi Nomura
    1999 Volume 119 Issue 1 Pages 103-108
    Published: January 01, 1999
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    To improve the current waveform of diode rectifiers, we propose a new operating principle for the voltage-doubler diode rectifiers. In the conventional voltage-doubler rectifier circuit, relatively large capacitors are used to boost the output voltage, while the proposed circuit uses smaller ones and a small reactor not to boost the output voltage but improve the input current waveform. A circuit design method is shown and confirmed experimentaly. The experimental results of a 1.6kW rectifier show that the proposed diode rectifier satisfies the harmonic guide lines. A high input power factor of 97% and an efficiency of 98% are also obtained. The new rectifier needs no controlled switches to meet the harmonic guide lines, resulting in a simple, reliable and low-cost ac-to-dc converters in comparison with the boost-type current-improving circuits.
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  • Shoji Fukuda, Yasumasa Matsumoto, Akira Sagawa
    1999 Volume 119 Issue 1 Pages 109-116
    Published: January 01, 1999
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Neutral-point-clamped voltage source rectifiers (NPCR) are suitable for high voltage systems because of their circuit structure. The NPCRs, however, have a problem that the neutral point potential (NPP) varies when the current flows into or out of the neutral point. The variations cause voltage deviations in the input waveforms as well as unbalanced voltage stress on the devices. Accordingly, reducing NPP variations is very important. This paper describes a controlling method for NPCRs based on a state space model. The neutral point current is treated as one of the inputs. The controller is designed based on the optimal regulator theory in order to achieve the control of DC voltage, power factor and NPP, simultaneously. The validity of the proposed method is demonstrated by experimental results.
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  • Kazuyoshi Hitosugi, Shoji Moriyasu
    1999 Volume 119 Issue 1 Pages 117-118
    Published: January 01, 1999
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Armature winding of a small sized three-phase a. c. machine is preferably used with a single-layered and full pitched coils, in order to reduce manufacturing cost. But, this winding produces a great deal of the higher harmonic components of the magnetic field and causes stray losses, magnetic noises and parasitic torques.
    This paper proposes the equivalent short pitch winding for the single-layered coils and the characteristics improvement.
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