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Akira Naito
1998 Volume 52 Issue 2 Pages
120-126
Published: February 20, 1998
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DisitalPhoto-Studio
Hiroyuki Hayakawa
1998 Volume 52 Issue 2 Pages
127-130
Published: February 20, 1998
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Hisao Naito
1998 Volume 52 Issue 2 Pages
131-137
Published: February 20, 1998
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Tsutomu Abe, Haruo Matsui
1998 Volume 52 Issue 2 Pages
138-141
Published: February 20, 1998
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Yoshiaki Oikawa, Kaoru Watanabe, Mitsuyuki Hatanaka, Kenzo Akagiri
1998 Volume 52 Issue 2 Pages
142-147
Published: February 20, 1998
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Introduction to Network Control Techniques : (2)
Shinji Shimojo
1998 Volume 52 Issue 2 Pages
148-152
Published: February 20, 1998
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Yutaka Sato
1998 Volume 52 Issue 2 Pages
153-156
Published: February 20, 1998
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1998 Volume 52 Issue 2 Pages
184a
Published: 1998
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1998 Volume 52 Issue 2 Pages
184b
Published: 1998
Released on J-STAGE: March 14, 2011
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Masuhiro Shouji, Yukio Ichikawa, Tomoyoshi Koizumi, Hiroki Katono, Tak ...
1998 Volume 52 Issue 2 Pages
194-199
Published: February 20, 1998
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We developed an unprecedented optical filter which has a luminous efficiency filtering function and an optical low pass filtering function for the downsizing of CCD camera optics. The filter was made of synthetic resin and it had phase grating on its surface. The light transmittance and the optical low-pass function of the new filter which had a 1 mm thickness were a little different from those of a conventional quartz device which had a thickness of more than 3 mm. We discuss the characteristics of and the production processes for the developed filter in this paper.
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Toshiaki Sawaji, Takeyasu Sakai, Hiromasa Nagai, Takashi Matsumoto
1998 Volume 52 Issue 2 Pages
200-205
Published: February 20, 1998
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Resistive fuses are necessary for implementing a weak string filter which can smooth out noise while detecting and preserving step edges inherent to original data This paper describes the implementation of a resistive fuse using two pairs of floating gate MOS transistors achieved by a standard double poly CMOS process
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Shoji Kawahito, Makoto Yoshida, Masaaki Sasaki, Keijiro Umehara, Daisu ...
1998 Volume 52 Issue 2 Pages
206-213
Published: February 20, 1998
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This paper presents a CMOS image sensor integrating focal-plane compression that uses analog 2-dimensional discrete cosine transform (2-D DCT) circuits and an adaptive resolution A/D converter. The focal-plane compression scheme we propose is useful for high-speed cameras and inexpensive, low-power portable cameras. The PSNR of the reconstructed image using the analog 2-D DCT circuits integrated on the CMOS image sensor is 36.7 dB. The power dissipation of the analog 2-D DCT circuits is about 10.8 mW at 3V for real-time CIF format image coding. The adaptive A/D conversion technique for 2-D DCT coefficients allows us to achieve low-power design throughout the digital video camera system.
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Masaaki Sasaki, Shoji Kawahito, Yoshiaki Tadokoro
1998 Volume 52 Issue 2 Pages
214-216
Published: February 20, 1998
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Yasuhiro Ohtsuka, Takeo Ozeki, Takayuki Hamamoto, Kiyoharu Aizawa, Mit ...
1998 Volume 52 Issue 2 Pages
217-219
Published: February 20, 1998
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Kazuyuki Tanaka, Hideya Takahashi, Eiji Shimizu
1998 Volume 52 Issue 2 Pages
220-226
Published: February 20, 1998
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Although electronic holography requires a large number of computations, we succeeded in generating holographic images, even moving images, using a parallel computer “CYBERFLOW” with 64 processors. Because of the computer's performance, however, the number of point sources in the image was limited. In this paper, we attempt to speed up the generation of images including more point sources, using a CYBERFLOW with 128 processors. Generation speed, however, does not increase in proportion to the number of processors with our conventional method of distributing the hologram among the processors, because this method results in differences between their loads. We propose an algorithm that distributes the hologram among the processors so that the difference between their loads can be reduced. Applying this algorithm to the 128 processors, we achieve a generation speed that is 2.76 times higher than that of the conventional method. We also propose a method for finding the most appropriate value of the parameter for the dynamic distribution.
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Yasuki Yamauchi, Keiji Uchikawa, Ichiro Kuriki
1998 Volume 52 Issue 2 Pages
227-234
Published: February 20, 1998
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The mode of color appearance gradually changes from surface-color mode to aperture-color mode as the intensity of the stimulus increases. We measured the upper-limit of luminance for the surface-color mode to find the determinants of mode perception. A subject adjusted the luminance of a test stimulus located at the center of surrounding stimuli so that it just started to appear as the aperture-color. The surrounding stimuli consisted of eight color chips and a white frame on a gray background, and they were either made using Munsell papers or presented on a CRT monitor. The results indicated that the upper-limit luminances was different in all the test colors. We also measured the brightness-luminance ratio (B/L) for each test color. The products of upper-limit luminance and B/L were almost equal for all test colors. A comparison of upper-limit luminance of our data and that derived from the optimal color for each test color also indicated less chromatic dependence. These results suggest that both brightness and optimal color may determine the transition from surface-color to aperture-color mode perception.
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