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Hiroshi Ito, Yoshiko Hatano, Takahiro Nakai
Article type: Article
Pages
371-
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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In very low bitrate image coding, DCT coeffcients tend to be quantized so coarcely that in effect most of them are truncated. The resulting artifacts are investigated from the view point of aliasing and anti-aliasing filters are proposed. Simulation results show that they lead to subjectively pleasing reconstructed images.
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Mario SATO, Toshiaki FUJII, Tadahiko KIMOTO, Masayuki TANIMOTO
Article type: Article
Pages
372-373
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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Emphasis is effective in the subband image coding. We propose a new spectrum model of images for designing emphasis filters. Coding simulation shows that the proposed scheme achives about 1dB improvement in SN ratio compared to the conventional DCT scheme.
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Shuichi WATANABE, Hiroyuki KATATA
Article type: Article
Pages
374-
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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New adaptive post filters are propsed to improve two conventional filters, a block distortion elimination filter and an ε-filter. The parameters of proposed filters can be changed adaptively by using a mask image which represents object region in the image. The smoothing power is controlled to be low in the foreground region and it is controlled to be high in the background region. Futhermore the continuous mask image is used so that the quality gap around the region boundaries are not visible.
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Hironao UENO, Yoshiyuki YASHIMA, Atsushi SHIMIZU, Fuminori OSAKO, Sato ...
Article type: Article
Pages
375-
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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The multiple compression and decompression cycles (multi-generation) of moving pictures degrades the picture quality. And the level of degradation may depend on coding conditions in each generation. In this paper, we provide a analysis of the multi-generation properties of the MPEG video compression algorithms.
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Yasuhiro Takishima, Shigeyuki Sakazawa, Masahiro Wada
Article type: Article
Pages
376-377
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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Quality control strategies for second generation video coding are proposed. Picture quality degrades severely in tandem video coding without a sophisticated quality control mechanism. Some coding parameters for the first coding such as the picture prediction type and the quantization step size are to be referred in the second coding. For the case that such parameters are unknown, this paper also proposes a practical way of reasonably assuming the parameters of the first coding.
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Sayuri MURAMATSU, Akio MURATA, Akio KUROE, Osamu KUSUMOTO, Kazuo YOKOY ...
Article type: Article
Pages
378-
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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Magnetization of CoCrTa/CoZrTa double layer medium being saturatedly magnetized has been reversed by the scanning probe that is magnetized in opposite direction to the magnetization of the medium. The reversed magnetization width of 0.2 micron has been observed by using bitter developing method and SEM.
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M. Shoji, H. Yamauchi, S. Sakai, T. Yoshida
Article type: Article
Pages
379-380
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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In a helical-scan recording system, multi-channel data transfer requires many heads aligned precisely in a scanner. A single-tip multi-head greatly facilitates this alignment. The new multi-head, combined with an ETF(Embedded Thin Film) head reported previously, has much smaller magnetic cores than a conventional multi-head. This minimizes the crosstalk that is an inherent problem in the multi-head. Head-tape contact for gap-to-gap distance up to 900μm has successfully achieved by adjusting the tip-radius and head protrusion.
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Toshiyuki MATSUI, Koji KAMIJO
Article type: Article
Pages
381-382
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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The total noise in the VTR reproduction process is colored noise due to modulation noise, which influences the error rate. In this paper, we propose a new method which can whiten noise in reproduced digital signals by subtracting the estimated modulation noise. We applied this method to actual reproduced digital signals, and confirmed that the proposed method can reduce modulation noise and whiten total noise in reproduced digital signals.
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Takanori YOKOYAMA, Hidetoshi SAITO, Yoshihiro OKAMOTO, Hisashi OSAWA
Article type: Article
Pages
383-384
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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This report describes a new rate 10/12 MSN code for PRML system in a high density digital magnetic recording. The result shows that a proposed MSN code for PR(1,0,-1)ML provides about a 0.9dB advantage compared with the conventional rate 8/10 MSN code at a symbol-error rate of 10^<-4>.
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Kohei WAKAMIYA, Hisashi OSAWA, Yoshihiro OKAMOTO, Hidetoshi SAITO
Article type: Article
Pages
385-386
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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An application of neural network equalization to the partial response maximum-likelihood(PRML) channel with partial erasure in high density digital magnetic recoding is studied. The bit-error rate performance is evaluated by computer simulation. It is shown that our system shows better performance than the conventional PRML system with Nyquist equalization.
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Yukio Kimura, Tadashi Noguchi, Hidehiro Ishii, Kouki Aizawa
Article type: Article
Pages
387-388
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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We have developed a Digital Laser Disc which is focused on having compatibility with the conventional Laser Disc, using Multi Level Recording Technology. Instead of analog video signals, digital data is recorded to the Laser Disc as an 8 level ASK (Amplitude Shift Keying) signal. The Digital Laser Disc can be played using a conventional Laser Disc player.
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Seiichi Tanaka, Kazumasa Ikeda, Tsutomu Mizusawa, Ken Hirata
Article type: Article
Pages
389-390
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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We have developed a new three-dimensional signal processing system for S-VHS VCR. The system makes it possible to record and playback wide-clear-vision broadcasting signal. It has been realized by effects of a new separation method for recording signal, as well as timebase corrector and phase management technologies for playback signals.
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Tetsuya YAMAMOTO, Kazuyuki NAKAMURA, Satoshi ITOI
Article type: Article
Pages
391-392
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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Optical Video Disk Recorder that is based on the SCALLER (Single-side CAv and cLv LinkER) format has been developed. In this paper, the outline of the SCALLER format and function of playback are reported.
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Takayuki MITONI, Masaki MITAMI, Hiroshi MAEJIMA, Takashi TACHIBANA
Article type: Article
Pages
393-394
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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We have developed the SCSI interface for VF-200 magneto-optical disk recorder. With this interface, the VF-200,which is a video and audio filing device, can be used as a mass strage device of PC or Work Station. This paper describes its system configuration and function.
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Shuji Aburai, Kennichi Tuzi, Hiroyuki Koga, Naruhiro Kimura
Article type: Article
Pages
395-396
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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Masashi Kubota, Tsutomu Matsui
Article type: Article
Pages
397-398
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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We have successfully developed "Track Vector Detection" for enabling tracking-pull-in and track-counting in the one-beam optical head for land/groove phase-change disk. Instead of setting the two-divided optical sensor, we arranged the four-divided sensor in which the division lines are aligned 45 degree to the radial direction for the disk. The differential output of two elements for radial direction is for the tracking signal, and the sum output for tangential direction gets the land/groove judgement signal.
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Koji Kaniwa, Yukinobu Tada, Hideo Nishijima
Article type: Article
Pages
399-400
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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The ATF system for VCR has been applying analog processing technology. IF it were digital processing system, all servo control systems could be integrated and the discrete parts should be reduced. Therefore, we developed digital processing ATF system that positively utilized the aliasing signal originated in sampling means.
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Akio ISHIKAWA, Daiichiro KATO, Kazuo ABE, Mitsuho YAMADA
Article type: Article
Pages
401-402
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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We are studying the shooting technique of broadcasting cameraman for development an intelligent robot camera. From basic experiments in soccer programs, we learned dynamic characteristics of cameraman's zooming. Here are the findings ; The range of the horizontal picture angle is about 2°〜17°; maximum velocity is over 220deg/sec ; etc.
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Masayoshi OBATA, Daiichiro KATO, Mitsuho YAMADA, Kazuo ABE, Akio ISHIK ...
Article type: Article
Pages
403-404
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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We studying an intelligent robot camera that shoots subject automatically. For this purpose, camera-work of broadcasting cameramen have been analyzed. In this paper, the position of subject in images was focused. Here are the findings ; broadcasting cameramen shoot the subject keeping space in the image toward the subject's moving direction, the fluctuation of the subject's normalized position in image ranged about 0.25 horizontally.
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Daiichiro KATO, Hiroyuki kUWABARA, Akio ISHIKAWA, Kazuo ABE, Mitsuho Y ...
Article type: Article
Pages
405-406
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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We are studying about an intelligent robot camera that can shoot convincing real images automatically, for broadcasting use. Therefore, we are measuring the data of broadcasting cameramen by the real time analyzer of camera-work. This time, We developed the high performance camera movement control system moved by those data. It has high angular velocity, 540deg/sec, high response, 15Hz(-3dB).
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Yuukou Horita, Masakazu Katayama, Tadakuni Murai, Makoto Miyahara
Article type: Article
Pages
407-408
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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The development of the objective quality estimation method of the color moving image is strongly hoped now. We investigated the objective picture quality estimation method of moving image. The PQSvideo (Picture Quality Scale for video) according to the evaluation model of the picture quality estimation approximate well the MOS (Mean Opinion Score).
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Yuukou Horita, Muhammad Yusuf Efendi, Tadakuni Murai, Makoto Miyahara
Article type: Article
Pages
409-410
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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The estimation accuracy of the picture quality scale previously reported depended on the image content. To improve the influence of the image content, we newly employ the global statistical features and texture features of the image in addition to the distortion factors of the image. The result shows that correlation coefficient between MOS and PQS (New) obtains 0.968.
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Tohru Tamura
Article type: Article
Pages
411-412
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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The effects of VDT display capability on reading speed were studied. Two kinds of displays with different display capability (813 pixels/horizontal line, 1024 pixels/horizontal line) were used. The subjects read 1100-1300 words from each display 4 times. Four character sizes that are 10,9,8,7 points were used. Reading speed was significantly faster from the higher display capability VDT when the character size was 8 or 7 points.
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Ken Shinkai, Takeshi Kohama, Tsuyoshi Saitoh, Mitsuho Yamada, Shiro Us ...
Article type: Article
Pages
413-414
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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The relation between attention and the visual information integration process across a saccade was analyzed. A chinese character was exposed briefly twice. In the second exposure, the location of the square frame exposed in advance to attract attention and that of the character were varied in four ways. As a result, saccadic latency tended to take bimodal distribution, suggesting that attention plays an important role in the visual information integration.
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Tsutomu MIYASATO, Fumio KISHINO
Article type: Article
Pages
415-416
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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In this paper, we report the results of experiments on how detection of pointing of objects can be achieved when a person in the screen points some targets in other party's space through a video screen. In the experiment, we compared the rate of pointing target detection between 3D diplay and 2D display which simulates TV conferencing.
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Kiichi Tanabe, Makoto Sugiyama
Article type: Article
Pages
417-418
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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A new visual discrimination task to analyze the timing of blinks is proposed. Some of previous work reported that blinks are likely to occur at the completion of information processing for visual stimuli. However the anticipation that blinks seem to be triggered simply by stimuli onset or offset can not be denied through conventional tasks. To separate these two factors, a dynamic presentation method is adopted in our task. As the results of psychological experiments, it is observed that blinks occur not only at the completion of visual stimuli processing, but also in association with only borth onset and offset of visual stimuli.
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Hironobu Kitaoka, Tomoaki Nakano, Shin Yamamoto, Takeshi Hayashi, Hito ...
Article type: Article
Pages
419-420
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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We developed the navigation system that guides the route by direction and distance. It was attached on ceiling of a car, so we needed to evaluate the its visibility while driving. This paper describes the visibility evaluation of it while driving. In addition, the improved method of using beep and displaying for recognizing information was investigated.
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Terumasa Oizumi, Shigeru Okabayashi, Isao Horiba, Noboru Sugie
Article type: Article
Pages
421-
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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After watching the objects outside the vehicle, double Image recognition can often occur caused by driver's convergenoe response delay. This may cause critical problem in various applications of HUDs. In this report, we have shown small angel of depression of the HUD can improve this problem.
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Kazunori Hokari, Kazushi Nakaya, Kei Mochizuki, Hideaki Kanda, Akira W ...
Article type: Article
Pages
422-423
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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The depth discrimination sensitivity of the visual system was measured using brightness and chrominance spatial sinusoidal grating patterns with binocular parralax. The sensitivity to chrominance patterns was remarkably lower than that to brightness patterns, and the highest sensitivity spatial frequency was higher for brightness gratings than for chrominance gratings.
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Satoru Kubota
Article type: Article
Pages
424-425
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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The purpose of this study is to investigate the required lightness and contrast for legibility of reflective liquid-crystal displays (LCDs). Thirty-seven subjects rated 65 lightness and contrast combinations displayed on the hard copy that simulate a reflective LCD, under the 500-lx illuminance condition. The results indicate that the lightness of the background should be higher than 65-70 (i.e. reflectance is 35-40%) and the contrast ratio between characters and background should be at least 5. The influence of frame lightness is not so obvious as the lightness of the background is higher than 65-70.
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Hidehiko ITO, Yukihiro SHINADA, Taiken SHIBATA, Hajime KENMOCHI
Article type: Article
Pages
426-427
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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In this paper, reproduction characteristics of received TV pictures transmitted by the public line are studied. We examined subjective test of JPEG compressed and non-compressed pictures endangered by beat intereference. The result shows that both of pictures are good coincident in picture quality.
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Junji Kawasaki, Hiroshi Hayashi, Akira Hayashi, Taizo Iijima
Article type: Article
Pages
428-429
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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We investigated our two-dimensional visual information processing model. We presented a theory and experimented results of the pulse density modulation image for a layered model which extended external world, retina and brain. This paper propose the propose the pulse density modulation image and the ordered dither image of GIRL and the restoration image using the equivalent approximation method.
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Norihiko Kanai, Noriyuki Yamada, Takatsugu Yoshihara, Keiko Momose, Ka ...
Article type: Article
Pages
430-
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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In order to design the optimum multimedia presentation, the relations between human factors and multimedia information were studied. Two measurements on the effects of voice were taken using human eye's movements. This paper describes main experimental results and discusses their relations for the evaluation of multimedia presentation.
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Phongsuphap SUKANYA, Ryo TAKAMATSU, Makoto SATO
Article type: Article
Pages
431-
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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Kinjiro Amano, Keiji Uchikawa
Article type: Article
Pages
432-433
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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We studied characteristics of memory for colored pictures. In the experiments, the observer memorized colored pictures and then he selected the same pictures in a set of test pictures. Some of the test pictures were only changed in chromatic and luminance contrasts. Our results indicate that both the chromatic and the luminance contrasts are emphasized in our memory.
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Akinori Kanda, Yuukou Horita, Tadakuni Murai, Yoshio Nakajima
Article type: Article
Pages
434-435
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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Sensitivity information that is received from an image such as "beautiful" or "warm" is influenced strongly on a shape of an object that composes a picture, color harmony and the inside structure of object. It is important to construct the color sensitivity space for extracting the sensitivity information of the monochromatic color.
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Takashi Hasegawa, Miyuki Takahashi
Article type: Article
Pages
436-437
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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Subjective color equivalency in the different modes of displays was discussed. The present data were obtained by color matching betweenoriginal colored patches and reproduced patterns on a liquid crystal screen. Difference of these data from the originals and from appearace on the CRT screen was shown mainly as darker reproduction and independence from illumination level in the room.
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JUN-ICHIRO TORIWAKI
Article type: Article
Pages
438-441
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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In this article the author presents a brief survey of features of medical image processing in the next few years, which the author calls medical vision. A virtualized human body as a virtual environment in computer is the most important feature. It realizes navigation based diagnosis like the virtualized endoscope system, surgical simulation, and, intra-operative computer aides such as image guided surgery and augmented reality. Computer aided diagnosis and automated screening of medical images are another important item, and referred to very shortly. Screening by a 3D image is a novel application to be noted. Network applications like telemedicine and anatomical atlas as a kind of characteristic media in medicine are also described shortly.
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Shigeki YOKOI
Article type: Article
Pages
442-445
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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In this paper, trends on multimedia and virtual space network technologies are introduced. Basically, the multimedia technologies are classified into three categories. The first one is called the package type mulimedia. Typical media for this type is a CD-ROM. Many multimedia titles are pullished on this media. DVD is a promising media in the next generation. Network type multimedia is to transfer digital media data through varous network lines. Actually, the telephone line, the cable TV, the ISDN, and the internet are used for the porpose. The third type is the multimedia using the wireless information transmission. Personal communications such as PHS are growing now. Digital bordcasting media such as digital television have been developed and new services have been provided. Moreover virtual spaces are connected through digital network and shared by users. Shared virtual space and VRML on WWW are promising technologies.
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Akira Iwata
Article type: Article
Pages
446-449
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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Multimedia technology will play an important role to promote the welfare of the people and build a healthy aging society. A tele-medical system using high speed digital line (B-ISDN) is experimented in Nagoya. The system enables us high speed data transfer of medical images and information and medical tele-conference. By the experiment we are investigating what tele-medical system should be in the 21th century.
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Masatoshi Tsuzaka
Article type: Article
Pages
450-453
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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The Internet application to medical use is mentioned this presentation based on experiences of developing ATM networks at some Radiological conferences.
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Naoki SUZUKI
Article type: Article
Pages
454-457
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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Medical virtual reality (VR) allows us to manipulate three dimensional (3D) human structures in 3D space in real-time. We attempted to construct a simulation system for surgical operations using VR techniques. The body of a patient including organs, is visualized as 3D images using serial MRI or CT data and the user is able to perform incisions on the skin and organ tissues, and to widen the incision line using surgical tools in virtual space. In this project we have tried to establish a system in which the user is able to perform realistic surgical procedures and to obtain a realistic response from the tools and tissues.
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J. Hasegawa, K. Mori, J. Toriwaki, H. Anno, K. Katada
Article type: Article
Pages
458-461
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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In this paper we introduce a virtualized bronchoscopy system. Using bronchus area extracted from a three dimensional chest X-ray CT image, this system enables to observe and navigate inside and outside the bronchus from arbitrary viewpoint and view direction. We can also measure a variety of shape features of the bronchus by interactive operation through a graphical user interface of this system.
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Masayuki Tanimoto
Article type: Article
Pages
462-465
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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It is strongly expected that multimedia is a key to produce new business and social reform. Today, multimedia field trials and service trials are being carried out in various places and many useful results have been obtained. In this mposium, the prospect of multimedia is viewed, by discussing the issues of multimedia opened through these trials from the viewpoints of technology and application.
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Fumito KUBOTA, Toshiyuki KATAGIRI
Article type: Article
Pages
466-469
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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The association for promotion of new generation network services which is an affiliated association of Ministry of Posts and Telecommunications is performing field trials of new generation network services in Kansai Science City near Kyoto. It is called the Pilot Model Project and provides various multimedia service trials such as Video on Demand for about 300 monitor homes through optical fiber distribution systems. Aims of the project are to evaluate technical and operational issues and usefulness of the services.
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Hiroyuki HARA, Hisao UOSE
Article type: Article
Pages
470-473
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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With the exploding penetration of the Internet, practical multimedia applications are becoming a reality in ordinary household. The Internet, however, has inherent problems to provide services with quality assurances due to its distributed "best-effort" network architecture. This calls for the use of B-ISDN (Broadband Integrated Services Digital Network) technology which has been conceived for the provision of multimedia applications in telecommunications field. This paper explains the general concept of B-ISDN and the current status of test trials using the technology.
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Kazunori Shimamura
Article type: Article
Pages
474-477
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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Taku KIYASU
Article type: Article
Pages
478-481
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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Yasuo TAKAKUWA
Article type: Article
Pages
482-485
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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ISAO USUI
Article type: Article
Pages
486-489
Published: July 17, 1996
Released on J-STAGE: October 02, 2017
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Those servies such as distribution & logistics are moving towards a new business system, which requires the use of multi-media technology. We are going to figure out how the future business would be through the multi-media experiment utilizing near futuristic network B-ISDN.
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