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Toyohiko Hatada
2002 Volume 56 Issue 8 Pages
1213-1215
Published: August 01, 2002
Released on J-STAGE: March 14, 2011
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Makoto Yoshimura
2002 Volume 56 Issue 8 Pages
1216-1218
Published: August 01, 2002
Released on J-STAGE: March 14, 2011
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Haruo Takeda
2002 Volume 56 Issue 8 Pages
1219-1221
Published: August 01, 2002
Released on J-STAGE: March 14, 2011
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Masahiro Kawashima
2002 Volume 56 Issue 8 Pages
1222-1225
Published: August 01, 2002
Released on J-STAGE: August 17, 2011
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Seisuke Oba
2002 Volume 56 Issue 8 Pages
1226-1229
Published: August 01, 2002
Released on J-STAGE: March 14, 2011
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Minori Yokozawa
2002 Volume 56 Issue 8 Pages
1230-1232
Published: August 01, 2002
Released on J-STAGE: March 14, 2011
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Shizuo Tokito
2002 Volume 56 Issue 8 Pages
1233-1239
Published: August 01, 2002
Released on J-STAGE: March 14, 2011
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Measuring Camera, Lens and Display ; Camera
Masayuki Sugawara, Yukio Uchida, Tohru Tamura
2002 Volume 56 Issue 8 Pages
1240-1246
Published: August 01, 2002
Released on J-STAGE: March 14, 2011
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Hiroaki Sugiura
2002 Volume 56 Issue 8 Pages
1247-1248
Published: August 01, 2002
Released on J-STAGE: August 17, 2011
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Yusei Nishimoto
2002 Volume 56 Issue 8 Pages
1249-1251
Published: August 01, 2002
Released on J-STAGE: August 17, 2011
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Yasufumi Wada
2002 Volume 56 Issue 8 Pages
1265-1272
Published: August 01, 2002
Released on J-STAGE: March 14, 2011
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An electron gun has designed with an asymmetrical main lens. A set of parallel horizontal planes placed at the exit of the main lens generates positive astigmatism with horizontally converged and vertically diverged lens action. The effect of this results in a main lens diameter in the horizontal direction of 11.1 mm and in the vertical direction of 6.7 mm, 23% larger and 33% smaller than the existing main lens, respectively. The electron gun reduces spot distortion at the screen periphery with the available dynamic voltage, making it suitable for 76cm and 86cm 120-degree 16 : 9 29.1 mm neck diameter color TV tubes.
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Mitsuhiro Kawanishi, Noboru Miura, Hironaga Matsumoto, Ryotaro Nakano
2002 Volume 56 Issue 8 Pages
1273-1278
Published: August 01, 2002
Released on J-STAGE: March 14, 2011
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We have enhanced the luminous efficiency of blue emitting BaAl
2S
4 : Eu thin-film electroluminescent (TFEL) devices decreasing the amount of oxygen impurities in the thin film and the leakage current of the TFEL device. The luminous efficiency of the device was increased to 0.19lm/W at 30 volts above the threshold voltage.
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Yasuhiro Yoshida, Yoichi Yamamoto
2002 Volume 56 Issue 8 Pages
1279-1290
Published: August 01, 2002
Released on J-STAGE: August 17, 2011
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We investigated the color characterization of LCDs because the workflow of the current ICC profile for display devices is inadequate for precisely managing the colors of LCDs due to the particular characteristics of the LCD components such as retardation, cross-talk, and non-linearity. To clarify these properties of the LCDs, we first investigated the characteristics of LCD components. In addition to the problem of primary color displacement, we identified other problems in practice that have to be considered for color management of LCDs. To solve these problems, we experimentally tested the color management of LCDs and found that subtracting the leakage light first to compensate for the displacement of the primary color works well in specially designed LCDs, but not in ordinary LCDs. We also found a color management error that cannot be disregarded. To solve these problems we investigated the application of a high-order 3x8 matrix. A significant improvement in color management was achieved. We also investigated the color management of LCDs installed in general bright environments. These findings should lead to a new color characterization model for LCDs that takes these problems into consideration.
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Yusuke Monobe, Tatsumi Watanabe, Akio Kojima, Toshiharu Kurosawa
2002 Volume 56 Issue 8 Pages
1291-1298
Published: August 01, 2002
Released on J-STAGE: March 14, 2011
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We describe an improved post-processing algorithm that reduces the blocking and ringing artifacts caused by quantization noise of the DCT coefficients in block-coding techniques such as JPEG without excessively blurring. It is a region-based algorithm that is iteratively applied based on projection onto convex sets. It first segments the decoded image into three regions : the region where blocking artifacts are strongly presented, the region consisting of edge pixels, and the region where ringing artifacts are presented. A process for reducing quantization noise suitable for each region is then calculated. Finally, the DCT coefficients are modified in accordance with the quantization constraint. Some experimental results demonstrate that this algorithm effectively removes the blocking and ringing artifacts in each region without excessively blurring.
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Kenji Ido, Hisako Hayashi, Hiroaki Miyagi, Nozomu Harada
2002 Volume 56 Issue 8 Pages
1299-1303
Published: August 01, 2002
Released on J-STAGE: August 17, 2011
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High-resolution LCDs with large work information area are required for PC and monitor applications. However, the high resolution leads to finer lines and smaller size in characters. In order to investigate relationship between LCD resolution and character readability, the authors performed an ergonomic evaluation of character readability using a 15-inch XGA TFT-LCD (86ppi) and UXGA TFT-LCD (133ppi). The results indicated that the 15-inch UXGA offered superior readability. Additionally, we were able to find some factors affecting character readability, including the balance of character size and stroke width.
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Satoru Kubota
2002 Volume 56 Issue 8 Pages
1304-1308
Published: August 01, 2002
Released on J-STAGE: August 17, 2011
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We investigated the effects of pixel density, character matrix size, and character size on the subjective legibility of liquid-crystal displays (LCDs). At a 30cm viewing distance, 50 subjects assessed the legibility under 33 different display conditions, we used 6 × 4.5 photographs to simulate the LCDs. We found that the character matrix for Japanese characters should be more than 10 × 10pixels when the characters are smaller than 2.7mm. For characters 2.7 to 3.5mm, the character matrixes should be 15 × 15 to 17 × 17 for single-stroke characters, and 22 × 21 to 27 × 27 for double-stroke characters. These results show that the preferred character matrix depends on pixel density, character size, and stroke width. The preferred stroke width for Japanese characters is 200 to 300 μ m. From the legibility point of view, the pixel density of displays should be increased to 250 or 300pixels per inch.
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Kunio Takayama, Katsuya Irie, Kenji Awamoto, Yasunobu Hashimoto, Keiic ...
2002 Volume 56 Issue 8 Pages
1309-1314
Published: August 01, 2002
Released on J-STAGE: March 14, 2011
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We developed a high-quality picture technology for PDPs with the DelTA (Delta Tri-color Arrangement) cell structure. A 42-inch PDP with the DelTA cell structure was found to have disordering in the display of horizontal lines. Using subjective evaluations, we demonstrated that picture quality can be improved by using a low pass filter, which reduces disordering without decreasing picture sharpness. To increase the vertical resolution, we developed the double density scan (DDS) processing technique. Using the DDS technique, we achieved a vertical resolution of over 700 TV lines on a 480-line DelTA-PDP. Comparing the vertical MTF characteristics of a 512-line DelTA-PDP with those of a 768-line square-cell PDP, and considering the effect of the format conversion, we demonstrated that a 512-line DelTA-PDP can be expressed to areas of higher spatial frequencies.
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Nobuhiko Tamura, Norimichi Tsumura, Yoichi Miyake
2002 Volume 56 Issue 8 Pages
1315-1320
Published: August 01, 2002
Released on J-STAGE: March 14, 2011
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We describe a display calibration model that is suitable for liquid-crystal displays (LCDs). In conventional display calibration models, the spectral radiance of light emitted from the display is estimated using the data measured for each primary color based on the assumption of RGB channel additivity, however, this assumption does not hold for LCDs. With only a few measurements of the spectral radiance or tristimulus values, the proposed model accurately approximates the colorimetric characteristics of the display. To evaluate the effectiveness of the model, we used it to measure the RGB primary colors, the CMYK secondary and the tertiary colors. The colors were analyzed based on principal component analysis to identify the effect of channel interaction. The proposed model was found to be more effective than conventional models for the colorimetry of LCDs.
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Atsushi Nakanishi, Toshiaki Fujii, Tadahiko Kimoto, Masayuki Tanimoto
2002 Volume 56 Issue 8 Pages
1321-1327
Published: August 01, 2002
Released on J-STAGE: March 14, 2011
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A new method for interpolating ray-space data is described that uses block matching and one-side dextension of the locus of corresponding points for arbitrary-view image generation. The block detects straight lines for interpolation. The one-sided extension interpolates occluded pixels. Testing showed that the proposed method generates intermediate images well even when occlusion occurs.
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Itaru Kitahara, Yuichi Ohta, Hideo Saito, Shinji Akimichi, Tooru Ono, ...
2002 Volume 56 Issue 8 Pages
1328-1333
Published: August 01, 2002
Released on J-STAGE: March 14, 2011
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A system for recording multiple videos in a very large-scale space, such as a soccer stadium, is described. It overcomes the problems of difficulty in recording synchronized multiple videos and in calibrating multiple cameras in a large-scale space. The system can record completely synchronized multiple videos with an identical timestamp for every frame captured at the same instant. Camera calibration in a large-scale space requires setting up an accurate coordinate system of the 3D world and defining many landmarks. The proposed system does this by combining a calibration board with a 3D laser-surveying instrument. A method for synthesizing a novel view from the multiple videos is also described, along with some experimental results. The technique deserbed in this paper is essential to realize a virtualized reality in a large-scale space.
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Yozo Shoji, Kiyoshi Hamaguchi, Hiroyo Ogawa
2002 Volume 56 Issue 8 Pages
1334-1341
Published: August 01, 2002
Released on J-STAGE: March 14, 2011
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A practical millimeter-wave video transmission system using the 60-GHz band has been demonstrated for indoor broadcast-satellite (BS) signal transmission. It uses a new millimeter-wave self-heterodyne transmission technique, and the transmission power distribution inherent in the technique is optimized. Testing showed that all BS video channels, including digital channels, can be transmitted without any disturbance of the oscillator frequency offset or any phase-noise effect over 10m under the condition that an additional 12-dB penetration loss occurs.
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Takashi Araseki
2002 Volume 56 Issue 8 Pages
1342-1348
Published: August 01, 2002
Released on J-STAGE: March 14, 2011
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Frequency domain adaptive filters, both orthogonal transform and subband types, are introduced into loop cancellers, which were developed to cope with loop coupling and multipath distortion at relay stations in digital terrestrial broadcasting systems using OFDM (Orthogonal Frequency Division Multiplexing). An additional loop configuration and a coefficient duplicating method are also proposed and evaluated for subband-type cancellers. Computer simulation showed that frequency-domain processing has better performance than transversal-type processing.
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Kenji Ikeda, Kousuke Imamura, Hideo Hashimoto
2002 Volume 56 Issue 8 Pages
1349-1353
Published: August 01, 2002
Released on J-STAGE: March 14, 2011
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Tomohiko Takahashi, Shigeyuki Sakazawa, Masahiro Wada, Hideo Yamamoto
2002 Volume 56 Issue 8 Pages
1354-1357
Published: August 01, 2002
Released on J-STAGE: March 14, 2011
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