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25.11
Displaying 1-12 of 12 articles from this issue
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Article type: Cover
Pages Cover1-
Published: February 08, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (16K) -
Article type: Index
Pages Toc1-
Published: February 08, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (68K) -
Daisuke Minoura, Satoshi Ishibashik, Phuoc Ngo Minh, Uan Do NgocArticle type: Article
Session ID: MIP2001-29/AIT2001-2
Published: February 08, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper describes a distance learning system for multiple users and its trial use at the Hanoi University of Technology(HUT)in Vietnam. With this system, a teacher and students communicate in a 3D virtual space and share 2D documents. Previous trials have shown that it is necessary for the teacher to be able to control the availability of the students' communication media. After improvement of the system, NTT and HUT are collaborating on evaluation of the system and are studying how Vietnamese use virtual communication media. This paper also describes the experimental environment of the ongoing trials and the goals of these trials.View full abstractDownload PDF (927K) -
Yasushi Yamazaki, Naohisa KomatsuArticle type: Article
Session ID: MIP2001-30/AIT2001-3
Published: February 08, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper describes a biometric-based key generation method and its application to a secure communication system. In the proposed method, a personal key which is unique to each user is generated by extracting his/her biometric information. Using the generated personal key, a secure communication system which has the functions of confidentiality and user authentication is realized. As an example of the proposed method, we introduce a personal key generation method based on one's handwriting, and a secure telewriting system which enables the encryption of handwriting information as well as the authentication of a writer. From simulation results, it is clarified that the proposed telewriting system can realize the above functions by using a writer's personal key.View full abstractDownload PDF (619K) -
Akira SUZUKI, Akio SHIO, Toru WAKAHARA, Sakuichi OHTSUKAArticle type: Article
Session ID: MIP2001-31/AIT2001-3
Published: February 08, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper describes a method that can improve the binarization of stripy patterns like wood rings or fingerprints while strongly suppressing noise. The method first divides the original image into small blocks, and then applies 2 kinds of frequency filters, a band pass filter and a least squares filter, to each block by using FFT. The application of the least squares filter to each block enhances the local dominant frequency components which can be considered as the local stripe's frequency components. The structure of the method is very simple because it doesn't need to discriminate the local direction of the stripe. The method can be applied to patterns whose stripe period varies like wood rings because it operates on the stripe's frequency in isolated areas. Experimental results indicate the effectiveness of proposed method.View full abstractDownload PDF (1254K) -
Ryoichi Kawada, Atsushi Koike, Masahiro Wada, Shuichi MatsumotoArticle type: Article
Session ID: MIP2001-32/AIT2001-3
Published: February 08, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSRecerltly, the concept of object scalability that also takes the contents of pictures into account unlike conventional scalability, has been proposed in MPEG-4. Object scalability in MPEG-4, however, assumes a VOP which requires the definition of shapes, so that it is not applicable to conventional coding schemes such as MPEG-2. This paper proposes a method of object scalable coding that can be adopted in these conventional block-based coding schemes. This method is based on SNR scalability, and it realizes scalability by differently controlling quantization on prioritized and non-prioritized parts. The bit-stream is compatible with SNR scalability, and for the enhancement layer picture, a similar SN ratio to that in normal SNR scalability can be obtained.View full abstractDownload PDF (772K) -
Hirotake Yamazoe, Akira Utsumi, Nobuji Tetsutani, Masahiko YachidaArticle type: Article
Session ID: MIP2001-33/AIT2001-3
Published: February 08, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe propose an automatic macera calibration method to calibrate the position and orientation parameters of a newly installed camera in our human motion tracking system. In the method, both 3D position tracking results and 2D positions and sizes on camera image planes are used for the calibration. Because we employ a simple 2D to 3D position translation method based on the observed size of the target, the calibration results become stable even if the input data includes large observation errors. Using this method, the cost of installing the camera in the human tracking system is effectively reduced. Experimental results show the effectiveness of the proposed method.View full abstractDownload PDF (600K) -
Hiromu KODA, Mayumi KUBO, Shojiro SAKATAArticle type: Article
Session ID: MIP2001-34/AIT2001-3
Published: February 08, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, we deal with the lag detection of artificial ghost images based on the cepstral technique in order to apply the ghost images to information hiding(digital watermarking). First we express the phenomenon of TV ghost in terms of a mathematical model and explain a procedure of producing a composite image which consists of original and ghost components. Secondly we describe the definition of power cepstrum and formulate the cepstrum of the composite image. After that, we introduce a cepstral difference between composite and original images and discuss some properties of the cepstral difference. Furthermore we consider the role of an exponential window function in the cepstral analysis of composite images. The computer simulated results for some test images show that the lag of ghost component in each image can be detected effectively by the cepstral difference even when the ghost component appears slightly.View full abstractDownload PDF (724K) -
Hiroki Takahashi, Masayuki NakajimaArticle type: Article
Session ID: MIP2001-35/AIT2001-3
Published: February 08, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper proposes color image segmentation algorithm which is aimed to assist image understanding. The proposed method is based on graph-based approach and employs comparison function proposed by P.F.Felzenszwalb et.al.. At first, variable weighted gaussian smoothing filter, which is also proposed in this paper to remain edge property, is performed to an image. Next, graph is generated, in which eight neighbor pixels are defined as nodes and, the distance of color in L^*u^*v^* color space and edge magnitude are defined as edge weights. Based on this graph, image is segmented. Finally, the segmented regions are integrated using inclusion relation among regions.View full abstractDownload PDF (504K) -
Hiroki Takahashi, Kouichi Kasai, Daewoo Kim, Masayuki NakajimaArticle type: Article
Session ID: MIP2001-36/AIT2001-3
Published: February 08, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper describes a method that extracts text regions from scenery images taken by digital camera. Many methods have been proposed for extraction of text regions from images. Most of them use a specific feature such as edge feature, color feature and so on. They, therefore, employ many conditions for extraction and it is also difficult to assign these parameters. This paper proposes an extraction method of text regions, which employs simple conditions, by using two kinds of features, edge feature and color feature. At the end of this paper, extracted text images from several scenery images and results of character recognition using a commercial software are shown.View full abstractDownload PDF (866K) -
Article type: Appendix
Pages App1-
Published: February 08, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (82K) -
Article type: Cover
Pages Cover2-
Published: February 08, 2001
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (67K)
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