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Article type: Cover
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Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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Article type: Index
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Published: February 03, 2003
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Takenori HARA, Tsuyoshi YAMAMOTO
Article type: Article
Session ID: HIR2003-1/ME2003-1/A
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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Usually, 3D CG is rendered as raster graphic. But, vector graphics has merit compared with raster graphics that it can get optimum image in any resolution. Especially, it is suitable for line draw graphics. In this paper, we describe about contour extracting method from 3D free form surface model to render contour as vector graphics. In vector graphics, curve is represented in 3rd order Bezier curve form, so it is necessary for contour to be approximated by Bezier curve. In this paper, we propose approximation technique that approximates contour with Bezier curve in surface parameter space, then it is substituted in surface equation (this represents approximated contour generator), and approximates it by Bezier curve in 3D space.
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Shigeki YOSHIKAWA, Yoshinori DOBASHI, Tsuyoshi YAMAMOTO
Article type: Article
Session ID: HIR2003-2/ME2003-2/A
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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In this research, using a 3D digitizer as an interface, we propose a system which can create clouds intuitively by carrying out direct pointing in the 3D space. It makes possible to create the desired clouds interactively in the position where a user wants. Various methods have been developed for modeling clouds to create realistic images of clouds. However they have problems, that is, like that calculation cost is expensive or a parameter setup is complicated. In this system, it is possible for a user to create clouds easily without spending calculation time.
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Kazuharu HATA, Tsuyoshi YAMAMOTO
Article type: Article
Session ID: HIR2003-3/ME2003-3/A
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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Conventionally, omni-directional panorama images are used as one of the methods of the virtual reality scene in which look round is possible. Already proposed also about the method of shooting all these omni-directional panorama images as stereo images from the viewpoint of both eyes. In this paper, we attempt reconstructing the change of the position of the viewpoint by rotation of human's head by using concentric mosaics which is a way method of an image based rendering to reduce uncomfortable feeling at the time of looking from side to side.
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Youhei NAKAMURA, Yoshinao AOKI
Article type: Article
Session ID: HIR2003-4/ME2003-4/A
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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In image-based modeling, we often use the way of modeling which users trace the ridgelines on the photographs in order to reconstruct the 3-D models only using input images. However, the method of reconstructing a perfect model by using automatic detection of ridgelines is not established yet. In this study, we use the photographs from two or more viewpoints. In order to reconstruct the 3-D models, the idea that the object is composed of some simple primitives is used. This study plans automatic modeling.
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Masayuki Otsuka, Yoshinao Aoki
Article type: Article
Session ID: HIR2003-5/ME2003-5/A
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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CG is used by various media by the remarkable improvement in the technology in recent years. In interactive 3DCG use in network environment, the rendering performance in real time is especially thought as important. The Image-Based Rendering is the generation technique of the arbitrary viewpoint picture which used the real picture, and can express a more complicated object and more complicated environment in a short time compared with the existing polygon expression. This research examined the 3-dimensional picture generating method which improves in reality nature, and accelerates by optimization of data processing compared with this conventional technique.
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Hirokatsu YAMAGUCHI, Testuya ITO, Masataka TOKUMARU, Noriaki MURANAKA, ...
Article type: Article
Session ID: HIR2003-6/ME2003-6/A
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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Akira KUBOTA, Kiyoharu AIZAWA
Article type: Article
Session ID: HIR2003-7/ME2003-7/A
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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In this paper, we present a novel approach to image-based rendering (IBR) for generating an arbitrary view image with arbitrary focus of a scene with two approximately constant depths. The presented method differs from the conventional IBRs using multiple view images in that we acquire two differently focused images at each camera position and render parallax and focus effects on each object simply by linear filtering of the acquired images without segmentation. Experimental results on the real images acquired with 4 cameras located in parallel are presented.
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Kaori Hashimoto, Yuji Ishikawa, Kaoru Wakabayashi, Tomohiko Arikawa
Article type: Article
Session ID: HIR2003-8/ME2003-8/A
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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We have studied a method of reconstruction of building side surfaces using two line scan cameras synchronized by a rotary encoder on a vehicle.We solved the problem of image distortions caused by vibration of the vehicle. But stereo matching is a difficult problem because of glasses, texture pattern, occlusion and so on. We propose a robust stereo matching method ,which consists of the following five steps: (1) calculating cross-correlation of two images, (2) plotting the value in 3D space which consist of X and Y image axes and a depth axis, (3) segmenting the 3D space, (4) voting a depth of surface in each segmentation space using the cross-correlation and (5) merging surfaces with the same depth. Experimentmental results using outdoor scenes including glasses, texture pattern and occlusion confirm effectiveness of this method.
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Ikue OSUGI, Jinhui CHAO
Article type: Article
Session ID: HIR2003-9/ME2003-9/A
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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Uniform color spaces are very important in color engineering, image source coding and multimedia information processing. In spite of many efforts have been paid on the subject, however, construction of an exact uniform color space seems difficult until now. Existing approaches mainly used local and heuristic approximations. Moreover, there seemed also certain confusion in definitions of the uniform spaces. In this paper we discuss the issue from a point of view of global Riemannian geometry. The equivalence between global and local definitions of uniform space are shown. Then an algorithm is presented to uniformize a color space.
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Jinji CHEN, Toshiharu MUKAI, Yoshinori TAKEUCHI, Tetsuya MATSUMOTO, Hi ...
Article type: Article
Session ID: HIR2003-10/ME2003-10
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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Relating audio-visual events is important for constructing an artificial intelligent system, which can acquire the audio-visual knowledge of movement through active observation without teaching. This paper proposes a method for relating multiple audio-visual events observed in the real environment. As corresponding cues, we use Gestalt's grouping law; simultaneity of the occurrence of the sound and the change in movement or the same motion starting, similarity of repetition between sound and movement. Based on their correlation coefficient, the component of frequency at sound onset is related to the short-term space-time invariants (STSTI) of movement. The effectiveness of proposed method is showed by using a pilot experiment in the real environment.
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Hiroki HAYASHI, Gou SAKAI, Tomoaki NAMIOKA, Masamitsu NORIGOE, Yoshino ...
Article type: Article
Session ID: HIR2003-11/ME2003-11
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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This paper discusses a characteristic of stereoscopic ophthalmological surgery images including ROI (Region of Interest). These images including ROI are divided into the ROI region of high resolution, and the non-ROI region of low resolution. When doctors supporting the surgery observe these images, an unnatural depth is perceived between two regions, and an appropriate medical support may be obstructed. The result of the subjective evaluation experiment using the random dot stereogram on the relation between the perceived depth and the degradation of a non-ROI region is shown.
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Takeshi FUKUTOMI, Hisaki NATE, Yasuhiro TAKAKI
Article type: Article
Session ID: HIR2003-12/ME2003-12
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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One of the problems of conventional 3D displays is the lack of safety to the ocular function. Observers feel fatigue because accommodation responses do not correspond to convergence. We have already proposed a new 3D display technique to solve this problem by displaying high-density directional images. This technique can be implemented by using modified 2D aligned telecentric optical systems. This technique also offers color and moving 3D images. In this study we measured accommodation responses to a prototype 3D display which can display 64 directional images simultaneously. Measured accommodation responses to the prototype 3D display were very similar to those obtained for real objects.
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Hirotsugu OKAMOTO, Kouzou OHARA, Noboru BABAGUCHI
Article type: Article
Session ID: HIR2003-13/ME2003-13
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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Clustering scenes in a video based on the similarity is one of the effective methods for structuralization of the video media. In this paper, we propose a method of clustering the fixed length video scenes making use of the user feedbacks in order to improve the accuracy of clustering. In the proposed method, the user feedbacks for arbitrary elements in a cluster whether they are relevant to the cluster through the graphical user interface visualizing the result of clustering. Then the accuracy can be improved by re-clustering based on the feedback information. Applying this method to the video, we demonstrated that good clusters were generated with feedback.
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Takehiro OGURA, Kouzou OHARA, Noboru BABAGUCHI
Article type: Article
Session ID: HIR2003-14/ME2003-14
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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Recently, the necessity for a system which supports an access to video medias has been increasing. In addition, it is strongly desired to take the user's preference into account to realize a more useful system. For this purpose, we propose a system which can automatically acquire the user's preference by monitoring the actions by the user, as well as which can provide the functions such as the efficient retrieval and browsing of video media, by taking advantage of the metadata. From experimental results, its usefulness is verified.
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Shinji MIYAHARA, Etsuro FUJITA, Shinji ABE, Yasuhito HAYASHI
Article type: Article
Session ID: HIR2003-15/ME2003-15
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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AssociaGuide is an associative content-navigation browser that uses a map-like browsing space. It lets users find information efficiently by using operations similar to those of digital maps. A typical application example is browsing and retrieval of video contents in a network. Content categories appear in the browsing space much like nebulas appear in outer space. If a user then zooms in on a category that he or she is interested in, small picture (thumbnail) that represent the contents of that category will appear. The user can click on a thumbnail to watch a video preview of the program, to review program details, or to view the program itself.
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Tomoaki NAMIOKA, Masamitsu NORIGOE, Hiroki HAYASHI, Gou SAKAI, Yoshino ...
Article type: Article
Session ID: HIR2003-16/ME2003-16
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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Acontent-based searching method of medical images using a P2P network was studied. Medical images are stored in peers together with the diagnostic findings (symptoms, etc.). The keywords of the diagnostic findings are registered in index servers. The keyword candidates of the diagnostic findings relating to the given searching keywords (medical subjects, parts of the body or kinds of medical images) are found by a search agent and are displayed. The search agent learns so that the keywords are shown in the higher order of relevance to the given keywords. Medical images, therefore, can be searched more efficiently.
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Masahide NAEMURA, Masaki TAKAHASHI, Toshihiko MISU, Yoshinori IZUMI
Article type: Article
Session ID: HIR2003-17/ME2003-17
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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Global motion estimation is one of important research issues in a computer vision field and opens a way to advanced video processing such as video codec, robot vision and object detection. Most of the methods to achieve motion parameters rely on statistical image-based matching. Recently there arise the sensor fusion based methods in which camera measurement technology helps estimating motion parameters. In this paper, we propose a new motion estimation method that takes explicit advantage of salient geometric image feature correspondence. The image features are lines existing in the image and are detected by Hough transform. In the proposed method, computation is carried out mainly on transformed hough space. It drastically decreases difficulties in performing line correspondence. The method is validated through simulation experiments.
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Jongdae KIM, Atsushi NAGAKURA, Jinhui CHAO
Article type: Article
Session ID: HIR2003-18/ME2003-18
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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In this paper, a new fibre bundle surface model is proposed for 3D object modeling. This fibre bundle model, consisting of local direct product of a base curve and a fibre curve, is able to represent arbitrary surfaces. In particular, the fibre bundle of 1-parameter groups, i.e. with fibres as 1-parameter groups are efficient in both synthesis and recognition. Indeed, the 1-parameter groups can be uniquely determined by six invariants of their Lie algebras. Besides the surfaces can be fastly generated by elementary function without numerical integration error. This model is also expected to be useful in object-based 3D image coding.
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Toru MIYAKOSHI, Masashi KAMEDA, Koichi MATSUDA, Akio DOI
Article type: Article
Session ID: HIR2003-19/ME2003-19
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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The encompassing goal of our research is to propose an universal image model for real images. Based on that image signals can be described by a set of quadratic curved surface units, this paper presents a new image construction method using Laplacian pyramid. The experimental results shows that the signal of each Laplacian plane can be approximated successfully by a set of quadratic curved surface units, and it is clarified that any real image signals are represented by the simple mathematical function.
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Masaki KITAHARA, Hideaki KIMATA, Yoshiyuki YASHIMA
Article type: Article
Session ID: HIR2003-20/ME2003-20
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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By using Surface Light Fields(SLF)[1] of a 3D object, one can visualize the view dependent appearances. Data compression is needed to reduce the data size. In order to obtain both high compression rate and interactivity, we consider the data compression of Surface Light Fields based on separable expansion and vector quantization. The proposed method applies vector quantization in a way that is better in terms of compression efficiency, compared to the conventional method[6].
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Tomomi OGAWA, Kiyoharu AIZAWA
Article type: Article
Session ID: HIR2003-21/ME2003-21
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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In this paper, we propose home video stratified indexing using audio to detect an event. Although exclusive audio segmentation and classification was usually used, various sounds overlap in practice. Then audio which various sound overlapped was expressed by labeling stratified index, moreover our method is suitable for event detection using audio. Features based on rules individually determine index generated from our method, which obtained from an output of sigmoid function. And determination and smoothing was applied in order to define index. In experiment, we show that the proposed method label four indexes of home video test data correctly.
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Naoki NITANDA, Miki HASEYAMA, Hideo KITAJIMA
Article type: Article
Session ID: HIR2003-22/ME2003-22
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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Since a kind of transition in the audio signals which is called audio-scene cut is generally utilized for segmentation of audio-visual materials, several audio-scene cut detection methods have been proposed. However, since most of the methods segment the audio signal in a fixed time interval before indexing, users cannot obtain the exact time of the audio-scene cut. In order to develop a more accurate audio-scene cut detection method, we utilize the fuzzy c-means algorithm. Our proposed method works as follows: (1) it detects all of the possible transitions in the audio signals without miss-detections; (2) it divides the audio signals into segments bounded by the transitions detected in (1); (3) it classifies the segments into the speech, music, and silence classes; (4) it merges the semantically similar adjacent segments by comparing their audio classes which are obtained in (3) and detects the audio-scene cuts. Further, in all of these steps, since the proposed method directly processes the sub-band data of the MPEG audio signal, the proposed method can be applied to the audio-visual indexing without any decoding procedures.
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Masae KONDO, Shin'ichi TAKAGI, Akihisa KODATE, Hideyoshi TOMINAGA
Article type: Article
Session ID: HIR2003-23/ME2003-23
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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In this paper, a video classification method based on the wave form analysis is proposed for the application of efficient video digest generation regarding users preference information. Our method is mainly based on the classification by the color information extracted from the video, regarding the transition of color information between video segments. Starting from the result of classification, we have also investigated the "rhythm of video" by the Godlove color distance defined in the HSV color space.
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Hiroshi AOYAMA, Shin KATO, Sadayuki TSUGAWA
Article type: Article
Session ID: HIR2003-24/ME2003-24
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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his paper describes a method for the indexing of dynamic traffic scenes to construct a traffic forecast service system with dynamic traffic scenes. The traffic forecast service system consists of the database of dynamic traffic scenes, and the indexing is necessary to retrieve a forecast scene from the database. The indeces consist of the traffic indeces like traffic volume and mean speeds as well as the general indeces like the place and time. A generation algorithm of the traffic indeces from dynamic traffic scenes and an algorithm for congestion decision will be reported.
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Yutaka ISHIZUKA, Yuzo HIRAI
Article type: Article
Session ID: HIR2003-25/ME2003-25
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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We propose an algorithm that can extract road traffic signs in real-time using color information. We applied the algorithm to video images taken from a car and verified that the algorithm performed satisfactorily. It is shown that the same algorithm can extract road signs at night.
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Yosuke YAMADA, Naofumi AOKI, Tsuyoshi YAMAMOTO
Article type: Article
Session ID: HIR2003-26/ME2003-26
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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This study focuses the expression recognition of facial images using higher-order local autocorrelation features and discriminant analysis. Higher-order local autocorrelation features are the higher-order extension of the autocorrelation function which is shift-invariant, and the range of the displacements is restricted within a 3×3 local region, the center of which is the reference point. Discriminant analysis linearly maps the primitive leaning data classified into some classes into new discriminant space, which maximizes the inner-class covariance while minimizing the between-class covariance. In this experiment, we photographs facial images of some test subjects with live basic expressions and calculates the recognition rate of expression using higher-order local autocorrelation features and discriminant analysis. We also consider the application to facial animation using the locus of expression changes in discriminant space.
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Masaomi TAKAHASHI, Ayako ENDO, Shigeru AKAMATU
Article type: Article
Session ID: HIR2003-27/ME2003-27
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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This paper describes a linear representation of the separated shape and texture spaces obtained by principal component analysis of the facial images that allows a smooth modeling of variations in the appearance of human faces. A computational model of image transformation acting on visual impression of the faces has been proposed by applying Fisher's liner discriminant analysis on the separated linear shape and texture spaces respectively, and rating evaluations are being made on its applicability to synthesis of impression-manipulated facial images.
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YANJUN Zhao, Miki HASEYAMA, Hideo KITAJIMA
Article type: Article
Session ID: HIR2003-28/ME2003-28
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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Watershed algorithms have been proposed as one type of segmentation method. This method can guarantee a closed and continuous boundary because the region is obtained by growing it from the center, called the mark, to the neighboring pixels. However the two problems of surplus segmentation and non-segmentation may exist at the same time. In order to solve these problems, a method is proposed that combines regions by making a comparison of their brightness after the watershed algorithm using edge features and marks has finished processing. To verify the efficiency of this method, the proposed algorithm is used to extract hair styles from digital images.
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Takeshi FUJITA, Naoto ISHIKAWA, Masato NAKAJIMA
Article type: Article
Session ID: HIR2003-29/ME2003-29
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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In this research, we propose the concept of the "QOD (The Quality Of Driving)". We have already established the method for quantifying the state of driving, and then estimate the "QOD". To evaluate the "QOD" of the driving state in actual urban road and expressway, we adopted three parameters: the degree of the meandering, the stability of the acceleration, and the sufficiency of the distance between own vehicle and the vehicle ahead, hi our system, we measure these parameters from the sequence of images taken by the camera placed on the dashboard of our vehicle, and velocity sensor and yaw rate sensor. Finally we evaluate the "QOD". This method has been tested on expressways and urban road. As a result, it is presented that our system can evaluate the stability of driving condition and warn the driver when the driving was not stable.
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Mamoru IWASA, Naoto ISHIKAWA, Masato NAKAJIMA
Article type: Article
Session ID: HIE2003-30/ME2003-30
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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Major cause of car accidents are human error such as neglect of safety confirmation and the accidents occur on urban road. We propose a front-vehicle observation system for urban traffic. First, we calculate projective transformation (a vehicle's front image is changed into the image seen from right above) of the vehicle's front image acquired by a single camera placed on the dashboard of our vehicle. Next, the difference of two projective transformation images is calculated. Finally, if there are obstacles in observation-required area, we calculate the degree of crashing risks depending on the distance to the front vehicle and the speed of our vehicle, and a warning is given to the driver. This system mounted on our vehicle has been tested on urban traffic. As a result, the effectiveness of our method has been verified.
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Hisanori TANADA, Masao NAKAGAWA
Article type: Article
Session ID: HIR2003-31/ME2003-31
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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In recent years, the demand for not only data but voice communications over IP network is increasing with development of VoIP. The same is true of inter-vehicle communications. Exchanging of not only data but voice bring drivers realistic sensations as if they existed in one room. This system for inter-vehicle communication is called "Virtual Wagon System". In this paper, we evaluate the virtual wagon system through experiments and consider the problems toward realization of its system.
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Yosuke ARAGANE, Masashi SATOMURA, Satoshi HIYAMA, Yukari TSUJI
Article type: Article
Session ID: HIR2003-32/ME2003-32
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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We proposed an e-mail support system using in the vehicle. This system has functions which are summary function and reply sentence generation function. We developed a prototype of this system and evaluated on real vehicle eivironment. According to this evaluation, we confirmed the effectiveness of these functions.
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Yoshiko TAKAO, Hitoshi NAKAYAMA, Keiichi UCHIMURA, Shinji WAKISAKA
Article type: Article
Session ID: HIR2003-33/ME2003-33
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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In our laboratory, the research on the digital road map creation is carried out. In creation of a digital road map, the image information and the information acquired from DGPS and three-axis gyroscope are used, the final accuracy is greatly dependent on the accuracy of DGPS in present state and accuracy becomes bad by various factors, such as the cover. Until now, the correction was carried out in such case.However, the accuracy is dependent on the three-axial gyroscope, and the shape unlike the road shape might be shown, when the error accumulated. Then, the technique using the polynominal approximation is proposed in order to get taking the shape as a result which is similar to the road shape.
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Yasunori SAKAI, Masao NAKAGAWA
Article type: Article
Session ID: HIR2003-34/ME2003-34
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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To prevent a car crash the system in which the car obtains its own positional information and exchanges it with the cars around it to control driving is effective. As the communication system to exchange the information various systems have been considered in the area of inter-vehicle communications and road-vehicle communications. But some problems for examples the delay caused by the time of establishing the communication link or a limit of the numbers of users still remain unsettled. In this paper the system specialized in positional and speed information that are most important information for safe driving is proposed. This proposed system uses M-sequence magnetic markers and variable frequency beacons and do not need the process of establishing the communication link. This proposed system is also effective in respect to that the number of vehicles whose positional and speed information can be obtained all at once is unlimited. The efficiency of this proposed system was showed by computer simulation and experimental results.
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Shinya TERASHI, Shoichi NAKABAYASHI, Takashi OHYAMA, Kiyohito TOKUDA, ...
Article type: Article
Session ID: HIR2003-35/ME2003-35
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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In Japan, the number of traffic accidents is increasing every year. Traffic accidents have become serious social problem. Then millimeter-wave radar has got attention as driving safety support system. Since millimeter-wave band has high rectilinear propagation characteristic and strong attenuation characteristic by atmosphere and rainfall scattering, it has remained in use on road with good visibility such as express highway. However, traffic accidents are occurring frequently on road with bad visibility. Automotive millimeter-wave radar has been started in practical application and tends to spread. Application of millimeter-wave radar on road with bad visibility is desired. In this study we examined possibility of millimeter-wave radar on road with bad visibility. We verified experimentally whether ranging by millimeter-wave radar is possible on road with bad visibility. Consequently, at curve inside tunnel, it turned out that ranging to outside of sight can be made possible by reflection of radar wave by wall of tunnel. Possibility of radar on road with bad visibility was found out.
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Shigemichi Watanabe, Yoshiyuki Hashikawa, Shin'ichiro Matsuo, Tak ...
Article type: Article
Session ID: HIR2003-36/ME2003-36
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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The researches on ITS are actively carried aiming to improve safely, amenity, and efficient transportation. However the researches on ITS systems including the security are few. So we proposed the secure gateway which is constructed the secure channel and makes service continue for DSRC(Dedicated Short Range Communications) network or wireless network. In this paper, we develop and evaluate this secure gateway under DSRC network and report these results. Moreover, the application domain of our proposal is discussed.
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Tomohiro Miura, Takeo Fujii, Yasuo Suzuki
Article type: Article
Session ID: HIR2003-37/ME2003-37
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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CMA Adaptive Array Antenna (AAA) can reduce interference signals without a reference signal when the desired signal has constant envelope. However if it applies to a base station of ITS Road to Vehicle Communication (RVC), the CMA AAA is difficult to separate both vehicles when the vehicles are crossed each other. As a result, some times the desired signal is suppressed after crossing both vehicles. In this paper, we evaluate the possibility of the problem of CMA in RVC system and propose the method to avoid such a problem by mitigating the of constant-envelope properties of undesired signals using timing shift of the synchronized point of cosine roll off filter.
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Syuhei HORIKOSHI, Masahiro FUJII, Makoto ITAMI, Kohji ITOH
Article type: Article
Session ID: HIR2003-38/ME2003-38
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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Recently, inter-vehicle communication(IVC) systems using millimeter wave are widely researched. In IVC, it is effective space diversity using multiple reception antenna because reception power characteristic can be expressed by conventional two path model when vehicle speed is low or stopping. But when vehicle speed is high, reception power variation caused by the movement of vehicles cannot be expressed by the conventional two path model. Since the road-reflected path considered to be the main cause is the almost same path length as the direct path, difference in delay time between the received radio waves along the direct path and road-reflected path is very small. In line of sight propagation of IVC, there is large influence of road-reflected path. Therefore, to realize a millimeter wave IVC system, analysis of propagation of the wave and examination of the suitable method of reception under multipath fading are very important. In this paper, a multipath propagation model of millimeter wave based on road-reflected path is proposed, and performance evaluation of array antenna is examined in case of bad propagation environment.
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kouji TSUKAMOTO, Masahiro FUJII, Makoto ITAMI, Kohji ITOH
Article type: Article
Session ID: HIR2003-39/ME2003-39
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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Inter vehicle communication(IVC) systems are attracting considerable attentions and several systems were proposed and are under development to realize an IVC system in the near future. In oder to realize an IVC system, it is very important for each vehicle to acquire the locations of other vehicles. Therefore, we propose a scheme to identify relative positions of vehicles afor the construction of an IVC network. In the proposed system, vehicles and base stations on the road side are connected by a single directional network and the relative position information is circulated in the network. This network makes each vehicle possible to identify positions of other vehicles. The effect of the proposed system is analyzed by computer simulations.
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Fumihide KOJIMA
Article type: Article
Session ID: HIR2003-40/ME2003-40
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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This paper reports the outline of The 3^<rd> Workshop on ITS Telecommunications (ITST2002) held on Nov. 7^<th> and 8^<th> at Seoul Kyo Yuk MunHwa HoeKwan Hotel (Seoul, Korea). This international workshop focusing the telecommunications technologies for ITS is sponsored by Communications Research Laboratory, YRP R&D Promotion Committee, Electronics and Telecommunications Research Institute, and Korean Institute of Communication and Sciences. ITST2002 includes one keynote speech session, and 11 technical sessions to which 59 papers are totally contributed. Moreover, ITST2002 have introduced technical exhibitions by Japan and Korea companies and technical tour to the local telecommunications company, which has attracted a great deal of attentions.
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Article type: Appendix
Pages
App1-
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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Article type: Appendix
Pages
App2-
Published: February 03, 2003
Released on J-STAGE: September 20, 2017
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