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Displaying 1-12 of 12 articles from this issue
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Article type: Cover
Pages Cover1-
Published: November 28, 1997
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (18K) -
Article type: Index
Pages Toc1-
Published: November 28, 1997
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (70K) -
Hideo Saito, Mamoru Kubo, Ken-ichiro Muramoto, Kohki MatsuuraArticle type: Article
Pages 1-6
Published: November 28, 1997
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn the polar region, it is difficult to discriminate between clouds and ground surface from satellite visible or infrared data, because of the high albedo and low surface temperature of snow and ice cover. In this paper, a method to extract clouds from the surface is proposed. This study is based upon analysis of the NOAA/AVHRR infrared images in Antarctica. The algorithm consists of two major approaches : extraction of image features and a classification algorithm. Minimum distance classifier was applied to extract clouds from sea ice and ground using some image features. To improve the classification accuracy, threshold boundaries for minimum distance classifier were changed. In this way, misclassified areas were decreased without decreasing classified area.View full abstractDownload PDF (958K) -
Mitsuaki MARUYAMA, Toru SHIINA, Ken-ichiro MURAMOTO, Kohki MATSUURAArticle type: Article
Pages 7-12
Published: November 28, 1997
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIt is important in the investigations of the falling motion of snow particles for the growth during their fall. Suitable equipment, however, to measure the falling motion of snow particles has not yet been developed. In order to study the relationship between the falling motion and the shape of the snow particles, we developed the system that can measure the falling motion and the shape of snow particles simultaneously with a CCD camera and a computer with an image analysis board. There were some relationship between the shape characteristics.View full abstractDownload PDF (616K) -
Y. Takishima, S. Sakazawa, M. WadaArticle type: Article
Pages 13-18
Published: November 28, 1997
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper proposes a new architecture to develop a distant video duplication system for high-quality digital VCR. The proposed system can work on any type of best-effort networks to transmit AV signals in semi-real-time operation. The video signal is compressed by a pseudo-loss-less technique with no or very little visible noise to gain the transmission time. The system is also featured by an intelligent transmission control protocol that ensures error-free duplication even in case of unexpected link cut-down. System operation and transmission efficiency focused on the buffer occupancy transition is also analyzed theoretically in this paper.View full abstractDownload PDF (836K) -
Shigeyuki SAKAZAWA, Yasuhiro TAKISHIMA, Masahiro WADAArticle type: Article
Pages 19-24
Published: November 28, 1997
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSMulticast attracts attentions as a transport technique for an efficient video broadcasting on the Internet and LAN. However a simple multicast cannot cope with various requirements from receivers, so a new video multicast model is proposed where layered coded video streams are transmitted via multiple multicast sessions and a receiver can choose sessions to receive according to its available resources. Here, I, P and B prediction mode and data partitioning are employed to split the encoded video stream. Layered stream assignment to sessions and bitrate allocation between splitted video layers are given through the analysis of a receiver buffer and quality of video reconstructed from a portion of sessions.View full abstractDownload PDF (829K) -
Katsuyuki NAKAMURA, Kazumasa KOBAYASHI, Suguru YAMAGUCHI, Yuji OIEArticle type: Article
Pages 25-30
Published: November 28, 1997
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSAlthough users have video materials, they cannot transmit their video streams through the heterogeneous network environment. In this paper, we propose a new video routing system VINE (Video InterNetworking Environment) for the purpose of integrating these heterogeneous network. VINE can assemble video materials distributed in the various network into a video stream with the unique identifications of materials and its routing protocol. We describe the specification of the VINE protocol as the routing protocol and implement this. Moreover, according to the result of the experiments using the VINE protocol, we show the possibility of the construction for video transmission environment on the basis of VINE.View full abstractDownload PDF (614K) -
Munekazu DATE, Yoshie TAKEUCHI, Kinya KATOArticle type: Article
Pages 31-36
Published: November 28, 1997
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSHolographic polymer dispersed liquid crystal (HPDLC). which we have proposed as a reflective display device, has the potential to be an active holographic optical element (HOE), whose diffraction efficiency can be changed by an electric field. Since it is a volume hologram, it has high efficiency and does not make unnecessary diffraction, unlike a thin grating. Because the state of the device can be held even after the electric field has been removed, the diffraction is stable under active matrix driving. Among liquid crystal devices, this device operates at high speed (about 1 ms). Therefore it is promising for real-time optical image processing of moving pictures.View full abstractDownload PDF (837K) -
Akio Yamamoto, Hiroshi Nogami, Takashi OokuboArticle type: Article
Pages 37-42
Published: November 28, 1997
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe have studied equalization techniques using pilot carriers for an OFDM system. The signal to interference ratios (SIRs) of the equalizer output signal over the time-invariant multipath channel (D/U=10dB) are calculated for several interpolation schemes : interpolation by FIR filters with the sinc functional impulse response, constant interpolation, linear interpolation and simplified liner interpolation (which can be realized without multipliers) schemes for the channel response estimation. The results show that the SIR of 26dB (input CNR=30dB, delay time of interference signal=11 μ S) are obtained for the simplified linear interpolation which can reduce the hardware complexity compared with other interpolation schemes. The SIRs are also calculated to the timing phase offset for the FFT window position in case of the FIR filters and the simplified linear interpolations. The results show that the degradation of SIR is very little even when the offset value becomes up to 20 samples for both cases.View full abstractDownload PDF (785K) -
Kazuyuki KODAMA, Hideyo WAKIArticle type: Article
Pages 43-48
Published: November 28, 1997
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, we propose an objective evaluation model for image retrieval technology based on shape and color features. We created this model through (1) similarity rating test for every image pairs (2) and multi-dimensional scaling method, on 32 landscape photographs. Consequently, we could get psychological distances between every two images, and could evaluate image retrieval accuracy, referring to the distances.View full abstractDownload PDF (1208K) -
Minoru Wada, Tsutomu Hashimoto, Hiroshi Takeda, Yasushi Matsumura, Tet ...Article type: Article
Pages 49-56
Published: November 28, 1997
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe established a teleconference system for cardiovascular disease composed of Super High Definition (2048pixel^*2048line^*60frame/s) Image system and broadband ISDN. And we held a teleconference between Osaka university and Kyoto university. For this experiment we selected about 1000 images (containning moving images) taken from 1 patient with ischemic heart disease, and digitized them and made 243 frames. These images were evaluated by 21 cardiac specialists and proved to be sufficient for making diagnosis. We prepared a graphical user interface (GUI) for image retrieval based on the medical events and modalities. In addition we prepared pointing device on the display monitor and TV phone for effective conference. Images prefetched in the both frame memorys can be selected and displayed on the monitor by opreating the GUI from both side.View full abstractDownload PDF (1252K) -
Article type: Appendix
Pages App1-
Published: November 28, 1997
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (76K)
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