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Displaying 1-10 of 10 articles from this issue
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Article type: Cover
Pages Cover1-
Published: November 22, 2002
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (15K) -
Article type: Index
Pages Toc1-
Published: November 22, 2002
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (41K) -
Masanori NAKAMURA, Mitsuteru SAKAMOTO, Yukio KOSUGIArticle type: Article
Session ID: BCS2002-55/AIT2002-1
Published: November 22, 2002
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSObserving damages immediately by detecting changes from geographic images is required when large scales of disasters occur. In our previous work, we proposed an unique adaptive nonlinear stereo mapping method, which compares aerial images, or satellite images taken at a different time, and have realized the accurate change detection in the case with parallel translations between two images. In this paper, we examine the method, based on the previous one, which realizes the accurate change detection from images including rotational translations or nonlinear distortions. The multi-leveled exploration process simplifies parameter settings and realizes the efficient exploration of corresponding areas. Further more, correct transfer vectors can be constructed by the selective smoothing, which replaces transfer vectors with a neighborhood vector selectively. By evaluating changes detected by the proposed method, with ROC (Receiver Operating Characteristic) method, the proposed method is proved to be in the stable accurate change detection compared with the previous method.View full abstractDownload PDF (1005K) -
Masafumi OHTSU, Nobuhiko MUKAI, Makoto KOSUGIArticle type: Article
Session ID: BCS2002-56/AIT2002-1
Published: November 22, 2002
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn surveillance, it is performed to count and trace persons in moving pictures taken by a camera. It is better to use one camera considering camera stand area and its cost; however, in this case persons in the picture are overlapped and it is difficult to extract the persons. In this paper, a method extracting and tracing persons is described. At first, the candidate area is extracted by calculating a different image between the current image and its background. Next, a candidate area including some persons is dissolved and the extracted information is used for the next tracing. Finally, we succeeded in tracing persons with only one camera.View full abstractDownload PDF (926K) -
Kenji TANAKA, Yasunari SUZUKI, Terumasa AOKI, Hiroshi YASUDAArticle type: Article
Session ID: BCS2002-57/AIT2002-1
Published: November 22, 2002
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSCommunications Research Laboratory (CRL) proposed the QHD (Quadruple HDTV: 3840^* 2048 pixels) format, which has twice as much pixels in both vertical and horizontal directions. Both CRL and Victor Company of Japan, Ltd. have co-developed camera system and projector with the QHD format to execute the subjective evaluation and verify the effectiveness. We also would like to propose an adaptive video distribution model as one of the applications of 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. We already reported the estimation of coding parameter and results of verification test for QHD still image distribution model. This paper describes the outline of adaptive distribution model with DV (Digital Video) moving picture.View full abstractDownload PDF (759K) -
Shigeyuki SAKAZAWA, Satoshi MIYAJI, Yasuhiro TAKISHIMA, Masahiro WADAArticle type: Article
Session ID: BCS2002-58/AIT2002-1
Published: November 22, 2002
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSTCP-based streaming will be one solution for a video streaming service on a mobile phone network. Considering errors in the network and consequent TCP throughput variations, adaptation of the video encoding bitrate is necessary. In this paper, a bitstream switching scheme among video streams with various bitrate is proposed, and its control method according to a receiver buffer occupancy that is measured in decodable time is studied. Real time simulation results show that the scheme achieves best performance using a feed forward control of the buffer occupancy.View full abstractDownload PDF (655K) -
Koichiro TAKAHASHI, Kenichi TSUCHIDA, Kazuhiko SHIBUYAArticle type: Article
Session ID: BCS2002-59/AIT2002-1
Published: November 22, 2002
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe are developing the re-transmission systems of ISDB-T signals in buildings, tunnels and basements. One of the re-transmission techniques is the transmitting set of Leaky coaxial cable (LCX). The LCX was set on the aisle of the basement to avoid the noise, and measured the electric field strength and the bit error rate of re-transmitted signals by dipole antenna. The results showed that the electric field strength fluctuated as standing wave along the LCX, and this standing wave had deep fades. The degradation of the required CN ratio by the LCX transmission is less than 3dB.View full abstractDownload PDF (445K) -
Keita TAKAHASHI, Takeshi NAEMURA, Hiroshi HARASHIMAArticle type: Article
Session ID: BCS2002-60/AIT2002-1
Published: November 22, 2002
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSImage Based Rendering(IBR) is a technique to generate arbitrary views from images acquired by multiple cameras. Quality of synthesized scenes is known to be greatly affected by the density of image acquisition. Each theory, Plenoptic Sampling or Equivalent Depth of Field, quantifies the relationship between camera interval and synthesis quality independently. In this paper, we clarify the relation of the two theories, and propose Generalized Equivalent Depth of Field, which extends applicable scope of Equivalent Depth of Field. Generalized Equivalent Depth of Field is expected to be a useful measure to evaluate image acquisition and scene generation processes in IBR.View full abstractDownload PDF (798K) -
Article type: Appendix
Pages App1-
Published: November 22, 2002
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (74K) -
Article type: Appendix
Pages App2-
Published: November 22, 2002
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (74K)
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