ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
26.8
Showing 1-22 articles out of 22 articles from the selected issue
  • Type: Cover
    Pages Cover1-
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Type: Index
    Pages Toc1-
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Masafumi TAKASE, Yuji SAKAMOTO, Yoshinao AOKI
    Type: Article
    Session ID: HIR2002-1/MIP2002-20
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    ln computer-generated holograms, description for object model is important to achieve high quality reproduced-image. In this paper, we propose new algorithm for hidden surface removal method of computer erenerated holograms using Z-Buffer that is generally used in computer eraohics. The result of ootical exoeriments show that the method is applied to comouter generated holograms.
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  • Takeshi AOYAMA, Yuji SAKAMOTO, Yoshinao AOKI
    Type: Article
    Session ID: HIR2002-2/MIP2002-21
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Recently, it is oossible to get realistic images from three-dimensional data of CT or MRl using by volume rendering method. To use of stereoscopic display, it becomes more easily to recoenize of three-dimensional structures of objects. ln this paper, we propose a new rendering method of computer-generated hologram using volume rendering method. The method provides direct calculation of hologram data from three-dimensional data without intermediate processing.
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  • Riku KAIBE, Masatoshi MATSUMIYA, Naokazu YOKOYA
    Type: Article
    Session ID: HIR2002-3/MIP2002-22
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This paper presents an immersive virtual sculpting system which enables a user to zoom in a oart of 3-D solid object and make the part detailed by carving or adding materials. ln our modeler, ob jects afe represented by implicit surfaces based on ooint skeletons arranged on sampling erids and field functions. The level of detail of shape deformation depends on the size of sampling grids and field functions. which afe set up in every level of it. The detailed deformations have the data structure of locally detailed sampling grids. lo reduce the time reauired for rendering the surfaces and keep the quality of rendering, implicit surfaces are converted to an appropronriate number of polygonnatches according to the degree of zoom.
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  • Masatoshi MATSUMIYA, Haruo TAKEMURA, Naokazu YOKOYA
    Type: Article
    Session ID: HIR2002-4/MIP2002-23
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This report presents a virtual clay model developed for interactive virtual clay works which reauire real-time computation and rendering. XVe represent clay using particle systems and implicit surfaces. Particle systems enable the virtual clay model to behave like real clay preserving the volume. Implicit surfaces enable the virtual claymodel to have smooth surfaces surrounding particles. As for an interactive deformation of virtual clay model, we have developed a polygonization algorithm for fast rendering of virtual clay model and have employed multi-threaded processing for the entire algorithm. Experiments have shown the feasibility of the proposed model.
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  • Tsutomu ABE, Kiwame TOKAI, Yoshinori YAMAGUCHI, Osamu NISHIKAWA, Tetsu ...
    Type: Article
    Session ID: HIR2002-5/MIP2002-24
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We propose a novel range finder that can get 3D shape of objects. A principle verification experiment was enforced, and that method of effect was confirmed. This method takes range information acauisition in 1 -shot based on soatial encoding method. A multiple-value encoded pattern is projected on the object. As for this method, a monitor camera is arranged to cancel the influence of the texture of objects. Projection pattern is encoded aeain by using the image taken by the camera. The range image is in high accuracy by using the re'encoding image of the projection pattern. In this report we present the principle of the new range finder and acauired data.
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  • Toshiyuki AMANO, Motoki MATSUMOTO, Tsutomu ABE, Tetsuo IYODA, Osamu NI ...
    Type: Article
    Session ID: HIR2002-6/MIP2002-25
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Up to now a copying machine requires setting the document to the copy glass of the designated position. In addition to that, the copying machine cannot copy the non-flat shape document without distortion. So, we propose a next generation's document reader "Eye Scanner". The Eye Scanner is composed of the range finder, digital camera and pan-tilt stage system. Due to these devices, the Eye Scanner is able to read the document by the free viewpoint and able to generate the image which is not distorted by the geometric conversion. In this paper, we explain about the detail of the system. At the experiment, we show some result of distortion correction and show the result of image merging at divide capture.
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  • Nobuyuki YAGI
    Type: Article
    Session ID: HIR2002-7/MIP2002-26
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Trends and prospects of contents production in multimedia era are described fom the viewpoint of efficient use of metadata and contents. Outline of SMPTE and MPEG-7 standards are given, which specify metadata and file formats that are essential for efficient use of contents. DTPP and Beatus afe introduced as eood examples, which accumulate metadata and contents and utilize them efficiently. Examples of using various contents multiply are also introduced. Multiple-output program production is orooosed as a framework to produce contents efficiently in multimedia era.
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  • Yukihiro KAWAMATA, Kimiya YAMAASHI, Takaharu ISHIDA, Osamu TOMOBE
    Type: Article
    Session ID: HIR2002-8/MIP2002-27
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We developed a POI(Point of Interest) information providing system with digital terrestrial broadcasting. Digital terrestrial broadcasting is push-type information delivering svstem. It is useful for the POl information providing. However abroadcasting system needs to send the information periodically and the information must be saved into receivers' cache. Receivers cannot acauire the information quickly, and need to check valid term of the information. This paper proposes the following techniques to solve these oroblems. (l)The technique schedules broadcasting programs based on receivers' interest. (2)The technique manages valid term of the POl information.
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  • Toshio NAKAGAWA, Katsunori AOKI, Yuichi IWADATE, Yoshinori IZUMI
    Type: Article
    Session ID: HIR2002-9/MIP2002-28
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We developed a new Internet service method, ''a TV Program-linked web page navigation service", to guide Internet users to the web pages related to Tv programs quickly and easily. Users can enjoy the web contents using a virtual control oanel resembling a TV remote control device. This service solves the difficulty and frustration of users to find a paticular web page related to Tv programs immediately from the flood of information on the Internet.
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  • Yasuaki KANATSUGU, Seiko NAGASHIMA, Mitsuho YAMADA, Toshihiro SHIMIZU
    Type: Article
    Session ID: HIR2002-10/MIP2002-2
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We have developed a prototype system using image processing methods to enable users to select an object in a video scene by pointing a finger at the screen. We carried out experiments m which subjects oointed at a target on the screen m order to specify the oosition of a cursor. The results show that the sut!jects point with reference to midpoint between their eyes. We also evaluated the difficulty of ooeration of the prototype system, and ascertained both its actual Derformance and the level reauired for oractical use.
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  • Kosuke HARAI, Hitoshi YAMAUCHI, Hiromitsu TAKAHASHI, Daisuke MATSUURA
    Type: Article
    Session ID: HIR2002-11/MIP2002-3
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    As one method of preventing a traffic accident, an assist system for recoenition of run environment, such as restriction information is researching and developing. XVe have proposed about the technique of extractions circular road signs from road color images for a former system of recognizing road signs and alarming to drivers. This technique is based on restriction of search area by using the soecific colors, such as red, blue, yellow and white which are used for road signs, and extraction sign containing images by using its circular form. However, in order to recognize the classification of a sign using the result, the Droblem remained in the correctness of extraction. ln this paper, an improved technique of extracting circular road signs is presented.
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  • Yasuo INOUE, Naoto ISHIKAWA, Masato NAKAJIMA
    Type: Article
    Session ID: HIR2002-12/MIP2002-3
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    The increase in traffic accidents is becoming a serious social problem with the recent raoid traffic increase. In many cases, the driver's carelessness is the primary factor of traffic accident. and the driver assistance system is demanded fbr supporting driver's safety. ln this paper, we propose the new method of automatic detection and recognition of road signs by image processing. ln this research, high accuracy and the efficient sign detecting method are realized by removing unnecessary information except fbr a road sign from an image, and detect a road sign using shape features. Moreover, the real-time oneration in a software base was realized by holding down calculation cost. maintaining highly orecise sign detection and recognition.
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  • Shoji TANAKA, Satoshi TANAKA
    Type: Article
    Session ID: HIR2002-13/MIP2002-3
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This report proposes a simple yet robust face-parts tracking method aiming to optimum to consumer digital devices such as PDAs and Cell phones. Algorithms implemented on such consumer digital devices should be as efficient as possible because it should achieve both practical accuracy and real-time process under the lack of computational power and the limited amount of memory space. The proposed method detects face regions within video frames by employing a robust skin-color model which was developed in the field of Image Database. It then applies the Adaptive Histgram Equalization method towards the detected face regions for enabling to consistently detect such face-parts as eyes and a mouth which are darker than other parts. In addition, the method tracks those face-parts with simple logical arithmetic. Therefore, it is possible to guarantee robust and real-time process with the consumer device hardware. This report also presents experimental results.
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  • Hisaaki TABUCHI, Tadayuki TAYAMA
    Type: Article
    Session ID: HIR2002-14/MIP2002-3
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This study examined the effect of soatial frequency on the recognition of facial identity and exoression. We measured the root-mean-square (RMS) contrast sensitivity and signal-to-noise ratio (S/N) for human observers in identity and exoression tasks. We simulated the ideal observer oerformance and calculated the efficiency from human and ideal observer's signal energy. These data suggest that the facial image is orocessed by a single Gaussian channel which is the most sensitive to around 20c/fw (cycle per face width).
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  • Kunitoshi KOMATSU, Kaoru SEZAKI
    Type: Article
    Session ID: HIR2002-15/MIP2002-3
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    The DOT and wavelet coefficients have real values which are continuously distributed. Therefore the entropy of the quantized transform coefficients is also varied continuously, when the quantization step size is continuously changing. On the other hand, the integer lossless DCT and wavelet coefficients have integral values. Therefore the entropy of the quantized transform coefficients is not varied continuously for the quantization step size. Thus we must carefully determine the quantization step size for the integer lossless DCT and wavelet coefficients to make lossy compression efficiency high. In this paper, we will illustrate that we can not make use of the optimum step size of the lossy version as it is and propose the optimum quantization step size for the integer lossless transforms.
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  • Osamu WATANABE, Hitoshi KIYA
    Type: Article
    Session ID: HIR2002-16/MIP2002-3
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We consider lossy image coding methods using integer wavelet transforms and describe new applications of lossless JPEG2000 coding for re-encoding without the use of any coding parameters, such as the target rate. The relationship between lossless and lossy coding based on JPEG2000 is discussed and an efficient lossless coding method for lossy images is proposed. The proposed method is useful for the dubbing and editing of images and video sequences. By providing the result of some simulations, we demonstrate the effectiveness of the proposed method.
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  • Hitoshi YAMAUCHI, Hiromitsu TAKAHASHI
    Type: Article
    Session ID: HIR2002-17/MIP2002-3
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    A new image coding method, JPEG 2000, has a structure that allows separate a input image to sub-image 'tiles' and some discrete wavelet transform can apply to each tiles. In recently standardized JPEG 2000 Part 1, a number of specified transforms is only two. One is for irreversible coding, and another is for reversible coding. Though, in currently standardizing JPEG 2000 Part 2, any tranforms can be specified for each tiles, and this enables adaptive coding on tiles. In this report, what tile size is efficient for this adaptive coding is reported.
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  • Kenji TANAKA, Yasunari SUZUKI, Terumasa AOKI, Hiroshi YASUDA
    Type: Article
    Session ID: HIR2002-18/MIP2002-3
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We authors are aware of the further spread of the high-definition system and have developed the following two (next generation) formats that can provide even higher visual precision: one is WHO format (Wide/Double HDTV:3840*1028 pixels) that has twice as much pixels as existing HDTVs in the horizontal direction. The other is QHD format (the Quadruple HDTV:3840*2048 pixels) , which has twice as much pixels in both vertical and horizontal directions and accomplishes the precision equivalent to or beyond that of 35mm films. This paper describes the overview of the concept of WHD/QHD camera and projector that we have been researching and developing. We also would like to propose an image distribution model as one of the applications of WHD/QHD images for homes. Using the tiling function of JPEG2000, this model offers the contents which are effective, high precision and adapted for a viewers' needs.
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  • Type: Appendix
    Pages App1-
    Published: January 29, 2002
    Released: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Type: Appendix
    Pages App2-
    Published: January 29, 2002
    Released: September 20, 2017
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