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Shigekoto Kaihara
1998 Volume 52 Issue 9 Pages
1244-1246
Published: September 20, 1998
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Yoshiyuki Matsumoto
1998 Volume 52 Issue 9 Pages
1247-1248
Published: September 20, 1998
Released on J-STAGE: March 14, 2011
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Image Quality in Telemedicine-On the Color Image Reproduction
Masahiro Yamaguchi
1998 Volume 52 Issue 9 Pages
1249-1251
Published: September 20, 1998
Released on J-STAGE: March 14, 2011
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Eitaro Nishihara
1998 Volume 52 Issue 9 Pages
1252-1255
Published: September 20, 1998
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Naga-aki Ohyama
1998 Volume 52 Issue 9 Pages
1256-1259
Published: September 20, 1998
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System of Hospital/Clinic Cooperation in Himeji City
Keizo Shiota
1998 Volume 52 Issue 9 Pages
1260-1262
Published: September 20, 1998
Released on J-STAGE: March 14, 2011
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Satoki Homma
1998 Volume 52 Issue 9 Pages
1263-1265
Published: September 20, 1998
Released on J-STAGE: March 14, 2011
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Hiroshi Iseki, Kenji Nihei, Kyojiro Nambu
1998 Volume 52 Issue 9 Pages
1266-1269
Published: September 20, 1998
Released on J-STAGE: August 17, 2011
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Tomomitsu Baba
1998 Volume 52 Issue 9 Pages
1270-1274
Published: September 20, 1998
Released on J-STAGE: March 14, 2011
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Yoshinobu Mitsuhashi
1998 Volume 52 Issue 9 Pages
1275-1281
Published: September 20, 1998
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Local Expansion of Compressed Light Ray Data
Takahide Takano, Takeshi Naemura, Masahide Kaneko, Hiroshi Harashima
1998 Volume 52 Issue 9 Pages
1321-1327
Published: September 20, 1998
Released on J-STAGE: March 14, 2011
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In order to achieve flexible 3-D visual communication, we have proposed a light ray based describing method of 3-D images. Furthermore, we have proposed a new concept of “3-D Space Coding” to describe and transmit the entire visual data of a 3-D space. Because the amount of spatial data is huge, it must be compressed for transmission and for easy handling by computers. In order to synthesize an image from one viewpoint, it is not necessary that all of the compressed data are expanded. Only the data essential for each view should be expanded. In this paper, the concept of “3-D Space Coding” is explained and a method for expanding the compressed light ray data locally is discussed in detail. Experimental results show the potential applicability of the proposed method to deal with larger space by local expansion of compressed light ray data.
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Takeshi Naemura, Masahide Kaneko, Hiroshi Harashima
1998 Volume 52 Issue 9 Pages
1328-1335
Published: September 20, 1998
Released on J-STAGE: March 14, 2011
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The ray-based approach is powerful and useful for the description of 3-D images because of its neutrality to all types of 3-D displaying technologies This approach has been developed in order to reproduce the whole visual data captured at the transmitter However, for the purpose of augmented reality, not only is the reproduction of real visual data essential, but also the synthesis of virtual visual data For example, you may want to change the lightening condition of a scene which has already been captured in some photographs The goal of this work is to synthesize a virtual scene, in which we can easily move light sources The key feature is that the virtual scene is synthesized only from the photographs. From this point of view, this paper extends the concept of the ray-based description of 3-D visual data in order to cope with virtual light sources Experimental results show the potential applicability of this method to the augmented spatial communication systems.
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Kazuya Kodama, Akira Kubota, Kiyoharu Aizawa, Mitsutoshi Hatori
1998 Volume 52 Issue 9 Pages
1336-1342
Published: September 20, 1998
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In this paper, we propose a novel method for generating arbitrarily focused disparity images that uses multiple differently focused images. Given the assumption that the depth of the scene changes stepwise, we derive a formula for the reconstruction between the desired arbitrarily focused disparity image and multiple acquired images; we can reconstruct the arbitrarily focused disparity image by using the formula iteratively. We show that we can reconstruct arbitrarily focused disparity images of natural scenes. Our method requires only the point spread functions of the acquired images for reconstruction, it does not require any spatial segmentation.
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Toshio Numao, Yuu Nakatani, Masatoshi Okutomi
1998 Volume 52 Issue 9 Pages
1343-1350
Published: September 20, 1998
Released on J-STAGE: March 14, 2011
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We propose simple model for calibrating of our pan/tilt/zoom camera, which consists of two rotation stages, an electrically-controlled zoom lens, and a CCD camera. The simple model assumes that zoom changes do not cause any change in the optical axis, the image center, the position of the image plane of camera in world coordinates system, or the rotation axes of pan/tilt. We show that when our model is used, calibration can be achieved independently of the zoom setting and the number of parameters that must be estimated in calibration decreases.
Because calibration of the pan/tilt/zoom camera was achieved, we can obtain the images by which the viewing angle and the magnification are set in an arbitrary value. And we show that the images are easily integrated using the position between the images derived from the estimated parameters.
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Waiming Kong, Masayuki Nakajima
1998 Volume 52 Issue 9 Pages
1351-1356
Published: September 20, 1998
Released on J-STAGE: March 14, 2011
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This research proposes image-based hair modeling algorithm that is effective at producing a realistic hair model for virtual characters in the world of virtual reality, movies, television commercials, and simulation games. To create a realistic and physically accurate hair model, the importance of hair cutting and bending must he considered. The problems of cutting and bending are solved through the use of multiple images of a human model. Multiple hair images taken from different directions provide the cutting criteria. To calculate the bending angle, hair volume is produced from three images of the head taken from the right, back and top. This hair volume represents the real space volume where hair is found and guides the bending process until the hair strands are inside the hair volume. The use of the hair volume together with the hair-area-outlines produces a hair model that is not only realistic but also closely resembles the human model in the picture.One main advantage of this hair model is the ability to model hair for specific individuals which is very difficult to achieve with other methods.
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Yoshinori Kusachi, Kazumasa Yamazawa, Haruo Takemura, Naokazu Yokoya
1998 Volume 52 Issue 9 Pages
1357-1365
Published: September 20, 1998
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One image synthesis technique involves replacing one object in an image sequence with another object. A significant problem in such an approach is how to locate objects in created images in a consistent manner considering occlusion among objects. For example, if a person in a sequence of images can be replaced by another person, it is easy to keep a reasonable positional relationship between the objects. This paper proposes a method for substituting a walker in a video stream with a 3-D CG model of another person. It is assumed that the image sequence should be taken by a fixed camera and the walker in the image sequence should walk straight. Motion parameters of the walker in the image sequence are obtained by tracking the walker using a stepwise 3-D model matching technique. This method can reduce the cost of obtaining the motion parameters of a human 3-D model and can detect self-occluding parts. The 3-D CG model of a person is constructed by measuring the person, regarding the person as an articulated object. Image synthesis can be achieved by replacing the extracted human regions with another image (or CG model). The experimental results show that the proposed method can achieve a walker replacer.
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Tomokazu Murakami, Takeshi Naemura, Masahide Kaneko, Hiroshi Harashima ...
1998 Volume 52 Issue 9 Pages
1366-1369
Published: September 20, 1998
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Waiming Kong, Masayuki Nakajima
1998 Volume 52 Issue 9 Pages
1370-1373
Published: September 20, 1998
Released on J-STAGE: March 14, 2011
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This paper proposes a method to generate realistic hair model for individuals based on image processing, . The analysis and recognition of hair strands by image processing provide valuable data, particularly hair outline and the flow direction of the hair for the modeling of realistic hair model for individuals. The outline region acquired through image processing ensures that the generated hair strands fall neatly into the hair region. In the case of hair strands falling out of the outline region, weights are added on reduced at the interconnected masses in order to move the strand back into the hair legion. The lines extracted by image processing serves as guide-lines directing the hair strands to point in the desired direction. Through this algorithm, hair model with close resemblance to the individual can be achieved. This realistic hair model can find many applications in the generation of synthetic humans and creatures in movies, multimedia and computer game productions.
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Takahide Manabe, Toshio Harima, Yuichi Anzai, Norishige Chiba, Nobuji ...
1998 Volume 52 Issue 9 Pages
1374-1378
Published: September 20, 1998
Released on J-STAGE: August 17, 2011
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Takuro Hatakeyama, Yoshiki Koizumi, Yuichi Umeda, Masatoshi Uchio, Mas ...
1998 Volume 52 Issue 9 Pages
1379-1385
Published: September 20, 1998
Released on J-STAGE: March 14, 2011
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We developed a pointing device for manipulating multimedia on the personal computer for people who have a severe physical disability. We studied the design requirements of an input device for the disabled and developed a device that can be operated by rotating the head and by puffing and sipping from the mouth. Using infrared light as a communication link, the pointing device is composed of both a pointer and a controller. This new device allows the mouse cursor to move according to the angle of the head.
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Satoru Kubota
1998 Volume 52 Issue 9 Pages
1386-1390
Published: September 20, 1998
Released on J-STAGE: March 14, 2011
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We investigated the effects of lightness, contrast, and character size on preferred viewing distance (the most legible distance) and subjective legibility for reflective liquid crystal displays (LCDs). Twenty-nine subjects with normal visual acuity assessed the preferred viewing distance and the subjective legibility of 25 lightness and contrast combinations for five character sizes which were displayed on hard copies that simulated reflective LCDs. The results indicated that the preferred viewing distance correlated with the subjective legibility in the simulated reflective LCD. The relationships between the preferred viewing distance and the display image characteristics for reflective LCDs were discussed.
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Daisuke Ishido, Kazuya Kodama, Kiyoharu Aizawa, Mitsutoshi Hatori
1998 Volume 52 Issue 9 Pages
1391-1393
Published: September 20, 1998
Released on J-STAGE: March 14, 2011
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