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Masayuki Nakajima
2001 Volume 55 Issue 1 Pages
2-4
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
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NHK Archives of Television Programs-Significance and Challenges-
Akihiko Chigono
2001 Volume 55 Issue 1 Pages
5-8
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
JOURNAL
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A Brand-new YOKOHAMA Broadcast Library
Tetsuo Yamagishi, Yuji Nojiri
2001 Volume 55 Issue 1 Pages
9-13
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
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Two Examples-'Diary of Chuji's Travels (Daisuke Ito, 1927) ' and 'Taki no shiraito' : The Water Magician (Kenji Mizoguchi, 1933)
Tomonori Saiki
2001 Volume 55 Issue 1 Pages
14-17
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
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Tohru Ebisawa
2001 Volume 55 Issue 1 Pages
18-22
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
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Tatsuhito Naga
2001 Volume 55 Issue 1 Pages
23-30
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
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Construction of World Heritages by Virtual Reality
Takeo Ojika
2001 Volume 55 Issue 1 Pages
31-36
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
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Tsutomu Oohashi
2001 Volume 55 Issue 1 Pages
37-46
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
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Fumio Adachi
2001 Volume 55 Issue 1 Pages
47-49
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
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Akio Takamizawa
2001 Volume 55 Issue 1 Pages
50-54
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
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Tsuyoshi Teshima, Atsuo Sugawara, Hideki Murota
2001 Volume 55 Issue 1 Pages
55-61
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
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Mitsuhiro Takemura
2001 Volume 55 Issue 1 Pages
62-69
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
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Koichi Sadashige
2001 Volume 55 Issue 1 Pages
70-75
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
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From Analog Network to Digital Network
Takahiko Kamae
2001 Volume 55 Issue 1 Pages
76-81
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
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Hiroyuki Mano
2001 Volume 55 Issue 1 Pages
82-83
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
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Coherent Rake Receiver, Transmit Power Control
Mamoru Sawahashi, Takehiro Nakamura
2001 Volume 55 Issue 1 Pages
84-85
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
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Nobuyuki Miki
2001 Volume 55 Issue 1 Pages
103-111
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
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The variance of the bit error rate (BER) of orthogonal frequency division multiplexing (OFDM) transmission with the delay time and the phase of the multi-path has not yet been sufficiently clarified. Multi-path introduces amplitude ripples into OFDM transmission, and these ripples change the C/N of each carrier. These changes, in turn, lead to variations in the BER of each carrier. The BER of the entire OFDM is calculated by adding and averaging the carrier-by-carrier BERs. Using mathematical representations of these factors, we theoretically and experimentally demonstrated that the equivalent C/ N degradation from a reference C/N of 22 dB, where the BER of error-correction-free 64-QAM OFDM is 0.009679, oscillates periodically at a delay of 1/ (OFDM bandwidth) and approaches the average value as the delay time increases. We found that the BER has either local maxima or local minima at a delay time equivalent to 1/ (1· (OFDM carrier interval)), where 1 is a positive integer.
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Kazuhiro Fujita, Tomoko Tasaki, Takayoshi Shiiki, Yasuo Yoshida
2001 Volume 55 Issue 1 Pages
112-119
Published: January 20, 2001
Released on J-STAGE: August 17, 2011
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We investigated images consisting of an out-of-focus region and an in-focus region. The out-of-focus region was detected by applying a fuzzy clustering to the local correlation of the MDF (measurement differencing filter) output. The correlation was strong for the out-of-focus region, and weak for the in-focus region. The parameters of the out-of-focus process were estimated by matching the model correlation of the MDF output to the sample correlation. The detected out-of-focus region was restored by an iterative method. Computer simulation demonstrated that this method is effective.
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Haruhiko Murata, Yukio Mori, Akihiro Maenaka, Hidehumi Okada, Kunihiro ...
2001 Volume 55 Issue 1 Pages
120-132
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
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A correlative directional interpolation that realizes improvements of luminance signal resolution and pseudo-color reduction is proposed for progressive scan CCD (PS-CCD) with Bayer color filter array, which consists of checkered G filters and line-alternated R and B filters. First, a correlative direction on a target pixel is detected by calculating horizontal and vertical correlations between a target pixel and its adjacent pixels. Next, according to the correlative directions, two primary color signals that are not the target pixel' s color signal are interpolated as follows. The one on the correlative directional line is interpolated using fact that the color-difference signal for the target pixel is almost the same as averaged color-difference signal on the target line in the correlative direction. The other one not on the correlative directional line is interpolated using fact that the color-difference signal gradually changes toward any direction, even a direction with no correlation. Performance of this methodology is verified by software simulation. Result of software simulation indicates that this method has better transient characteristics and less pseudo-color than conventional method. These superior efficiencies have been performing this method a mainstream of signal processing for color video camera with a Bayer-filtered PS-CCD.
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Junji Shiraishi, Yoshio Yanagihara, Kiyoaki Tanaka, Hiromitsu Hama
2001 Volume 55 Issue 1 Pages
133-140
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
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In stereotactic radiosurgery, which treats a small region in the brain with a concentrated high-energy beam, it is critical to align the target center with the iso-center of the radiation system in order to minimize the volume of the surrounding normal tissue being irradiated. The accuracy of the alignment has been evaluated in a two-dimensional space by using a stainless ball phantom image. We have developed a computerized measurement method to measure three-dimensional alignment errors between the iso-center of the linear accelerator and the target center. Phantom images on X-ray films irradiated at eight different positions were employed in this new method. This program decreases the average alignment error from 0.31 to 0.12 mm, so it can improve the accuracy of treatment in a clinical setting.
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Junji Sone, Kouichi Konno, Hiroaki Chiyokura
2001 Volume 55 Issue 1 Pages
141-148
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
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Three-dimensional surface design of industrial products includes a wide variety of non-four-sided areas. Subdivision methods are widely used to interpolate the surface of these areas. But, smooth surface shape control of multiple surfaces is difficult. We used the trim surface for interpolation of these area, but shape control of the trim surface was also difficult. We have now developed a surface interpolation method for large non-four-sided areas that improves shape controllability by using NBG (NURBS Boundary Gregory) patch. This method classifies non-four-sided areas into five types of convex and concave shapes, and the interpolation manner is determined by shape type. It has been used to improve the surface modeling of industrical products.
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Kunio Yamada, Tadashi Ichikawa, Takeshi Naemura, Kiyoharu Aizawa, Taka ...
2001 Volume 55 Issue 1 Pages
151-158
Published: January 20, 2001
Released on J-STAGE: March 14, 2011
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A method for high-quality stereo panorama mosaicing is presented. A scene is captured with an original three-camera system as stereo moving-picture sequences. The images are stitched together after improving their texture. The multi-purpose three-camera system features accurate frame synchronization between three channels and can be used outdoors through battery operation. For registration of the panorama stitching, under a newly investigated distortion-free condition, affine parameters are estimated through the overlapped areas using the steepest descent algorithm. The texture improvement has two steps : vertical resolution recovery by field integration and image enhancement by two dimensional quadratic Volterra filtering that satisfies Weber-Fechner's law. The presented method enables high-quality stereo mosaicing with accurate mutual disparities between channels and without visible distortion of textures.
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Yuko Yamanouchi, Hideki Mitsurnine, Seiki Inoue
2001 Volume 55 Issue 1 Pages
159-166
Published: January 20, 2001
Released on J-STAGE: August 17, 2011
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To create a virtual studio that can generate highly realistic images in real time, we are developing technology that aims at creating a virtual studio based on image components from real pictures. The image components are divided to an environmental image component for long distant view and a three-dimensional image component for short distant view. We developed a principal-point alignment camera head for composing camera images into a high-resolution omnidirectional image as the environmental image component. We constructed an omnidirectional image (8000×8000 pixels) from about 1000 camera images and composed them into a complete view image seamlessly. We experimentally developed an HDTV image-based virtual studio with these image components and proved its usefulness for HDTV program production.
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