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Takanori Senoh
2001 Volume 55 Issue 4 Pages
490-491
Published: April 20, 2001
Released on J-STAGE: March 14, 2011
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Shigenobu Minami, Hirokazu Tanaka
2001 Volume 55 Issue 4 Pages
492-494
Published: April 20, 2001
Released on J-STAGE: March 14, 2011
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Setsuji Fujiyoshi, Yoshinori Goto, Hideyuki Akimoto
2001 Volume 55 Issue 4 Pages
495-496
Published: April 20, 2001
Released on J-STAGE: March 14, 2011
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Yukihiro Naito, Naoki Hikishima, Yoshiaki Ohta, Atsushi Hatabu, Ichiro ...
2001 Volume 55 Issue 4 Pages
497-498
Published: April 20, 2001
Released on J-STAGE: March 14, 2011
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Youichirou Hosokawa, Koji Sakurada
2001 Volume 55 Issue 4 Pages
499-500
Published: April 20, 2001
Released on J-STAGE: March 14, 2011
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Video Retrieval and Delivery
Kortaro Asai, Yoshiaki Kato, Susumu Oka
2001 Volume 55 Issue 4 Pages
501-502
Published: April 20, 2001
Released on J-STAGE: August 17, 2011
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Noriyo Kanayama
2001 Volume 55 Issue 4 Pages
503-504
Published: April 20, 2001
Released on J-STAGE: March 14, 2011
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Video Phone Software for Home Video-Game Machine
Satoshi Miyaji
2001 Volume 55 Issue 4 Pages
505-507
Published: April 20, 2001
Released on J-STAGE: March 14, 2011
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Keiichi Hibi
2001 Volume 55 Issue 4 Pages
508-510
Published: April 20, 2001
Released on J-STAGE: March 14, 2011
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Yoshiaki Shishikui, Takeshi Kimura
2001 Volume 55 Issue 4 Pages
511-513
Published: April 20, 2001
Released on J-STAGE: March 14, 2011
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Breakthrough by MPEG-4
Hiroshi Yasuda
2001 Volume 55 Issue 4 Pages
514-516
Published: April 20, 2001
Released on J-STAGE: March 14, 2011
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Can It be a Revolutio ?
Fukinuki Takahiko
2001 Volume 55 Issue 4 Pages
517-518
Published: April 20, 2001
Released on J-STAGE: March 14, 2011
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Leonardo Chiariglione, Yasuhiro Takishima
2001 Volume 55 Issue 4 Pages
519-520
Published: April 20, 2001
Released on J-STAGE: March 14, 2011
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Jiro Katto
2001 Volume 55 Issue 4 Pages
521-526
Published: April 20, 2001
Released on J-STAGE: August 17, 2011
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Local Network
Isao Saito, Nobushige Yokota
2001 Volume 55 Issue 4 Pages
527-534
Published: April 20, 2001
Released on J-STAGE: August 17, 2011
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Yasuki Yamauchi
2001 Volume 55 Issue 4 Pages
535-536
Published: April 20, 2001
Released on J-STAGE: March 14, 2011
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Network Configuration (Configuration of Equipments)
Mamoru Sawahashi, Takehiro Nakamura
2001 Volume 55 Issue 4 Pages
537-538
Published: April 20, 2001
Released on J-STAGE: March 14, 2011
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Yumi Mori, Kousei Tanahashi, Satoshi Tuji
2001 Volume 55 Issue 4 Pages
553-558
Published: April 20, 2001
Released on J-STAGE: March 14, 2011
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The local visual properties of liquid-crystal displays were investigated by using an original algorithm and commercial-available system. The extraction and evaluation of “mura”, regions of low-contrast and non-uniform brightness, was successfully accomplished. The algorithm was based on the results of research into sensory analysis and human perception. The sensitivity of the technique was demonstrated by the detection of changes at even the small levels which are perceptible to experienced manufacturing inspectors. The evaluation and judgment of “mura” by our technique closely matched the results of assessment by experienced inspectors.
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Takahiro Urakabe, Atsushi Ito, Hironobu Arimoto
2001 Volume 55 Issue 4 Pages
559-565
Published: April 20, 2001
Released on J-STAGE: March 14, 2011
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We have developed a display device that has a large-area, full-color flat screens and consists of many cells fabricated together on a single glass sheet. The device utilizes a Xe dielectric barrier discharge similar to the process used in plasma display panel. We have already reported on 64-inch display system employing 10-mm-pixel-pitch devices, at IDW'99. We have recently developed a 6-mm-pixel-pitch device. This paper describes the method of operation of these devices. The operating voltage margins were formulated by considering gas dielectric barrier discharges, and they were compared with the experimental data. There is an optimum operating frequency at which the device achieves maximum efficiency. The optimum operating frequency is 125 kHz in the case of a 6-mm-pixel-pitch device. In this operating method, a biasing voltage is added to a common electrode voltage pulse to reduce the required addressing voltage. The addressing voltage has thus been decreased by 50 V with respect to the conventional device for a given sustain voltage. The threshold addressing voltage is only 30 V for a 10-mm-pixel-pitch device.
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Hisashi Yoshida, Maki Minamoto, Masato Hayashi, Takeshi Hirai, Shiro S ...
2001 Volume 55 Issue 4 Pages
566-570
Published: April 20, 2001
Released on J-STAGE: March 14, 2011
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We have developed ultraviolet (UV) phosphors of a new type that is suitable for excitation by the vacuum ultraviolet (VUV) light generated by Xe discharge. The phosphors contain gadolinium (Gd) and praseodymium (Pr) in yttrium fluoride (YF
3). The YF
3 : Gd, Pr phosphor exhibits a strong emission line at 311 nm, and a weak emission band around 407 nm. The photoemission intensity of the 311-nm line is about 10 times as strong as for conventional UV phosphors. These emissions are effectively stimulated under excitation in the range from 150 to 200 nm, which corresponds to the f-d transition in Pr
3+ ions. These results suggest that the strong emission of UV is due to a highly efficient transfer of energy from Pr
3+ to Gd
3+ ions. The process of energy transfer between these ions is discussed in terms of the experimental results of this and other studies.
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Toru Tamaki, Tsuyoshi Yamamura, Noboru Ohnishi
2001 Volume 55 Issue 4 Pages
571-582
Published: April 20, 2001
Released on J-STAGE: March 14, 2011
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We propose a method for segmenting a color image and extracting a region of an object in a scene by using information which is not specific to the target object but common to a projection of the object in a space. The proposed method is based on a split-and-merge technique. The image is initially segmented into small regions by clustering in color space. Then the regions are merged based on four features of information on the configuration, connection and area ratio of adjacent pairs of regions. This merging allows us to extract an object as a single region even if the surface of the object is textured with a variety of reflectances; this isn't considered by conventional segmentation methods. We give our algorithm for segmentation and extraction, demonstrate experimental results, and make comparisons with some other methods.
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Satoru Kubota, Kenji Matsudo
2001 Volume 55 Issue 4 Pages
583-587
Published: April 20, 2001
Released on J-STAGE: March 14, 2011
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The effects of display luminance, contrast, and stroke-width of the characters of a liquid-crystal display (LCD) on performance in reading were measured for groups of young (N=25, mean age 21.2 years) and old (N=25, mean age 68.6 years) subjects. Reading rates were from 14 to 22% lower for subjects in the 'old' group. These differences between the young and old groups were greater for the conditions of low display luminance and contrast than for the conditions of high display luminance and contrast. We also measured the contrast sensitivity functions and visual acuity for near and distant objects in the two groups. The contrast sensitivities at a high spatial frequency and close-range acuity for the old group were significantly lower than those for the young group. Within the young group, no evidence was found for a significant correlation between any of the measured variables and the rate of reading. However, within the old group, the correlation between contrast sensitivity at a high spatial frequency and rate of reading were significant. These results indicate that contrast sensitivity plays a role in limiting the speed of reading. Age-related changes in the high spatial frequency contrast sensitivity will thus result in slower reading from displays with lower luminance or contrast. Requirements for electronic displays in terms of reading by older users were also discussed.
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