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Masayuki Nakajima
2001 Volume 55 Issue 11 Pages
1378-1379
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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Yoshihiko Hamamoto
2001 Volume 55 Issue 11 Pages
1380-1383
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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Satoshi Hosoi
2001 Volume 55 Issue 11 Pages
1384-1387
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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Ryuichi Oka
2001 Volume 55 Issue 11 Pages
1388-1390
Published: November 01, 2001
Released on J-STAGE: August 17, 2011
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Akio Yamada
2001 Volume 55 Issue 11 Pages
1391-1393
Published: November 01, 2001
Released on J-STAGE: August 17, 2011
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Sadaoki Furui
2001 Volume 55 Issue 11 Pages
1394-1396
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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Yasuhiro Katagiri
2001 Volume 55 Issue 11 Pages
1397-1399
Published: November 01, 2001
Released on J-STAGE: August 17, 2011
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Terumasa Ehara
2001 Volume 55 Issue 11 Pages
1400-1402
Published: November 01, 2001
Released on J-STAGE: August 17, 2011
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Hideo Miyoshi
2001 Volume 55 Issue 11 Pages
1403-1406
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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Attempts to recover vision with an ocularly implanted artificial device
Liming Li, Tetsuya Yagi
2001 Volume 55 Issue 11 Pages
1407-1410
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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Tadashi Shiomi
2001 Volume 55 Issue 11 Pages
1411-1414
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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Tatsuya Kurioka
2001 Volume 55 Issue 11 Pages
1415-1418
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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Yoshimichi Ohtsuka
2001 Volume 55 Issue 11 Pages
1419-1420
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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Yoshiyasu Suzuki
2001 Volume 55 Issue 11 Pages
1421-1422
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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Takayoshi Kusayama, Takayuki Hamamoto, Seiichiro Hangai
2001 Volume 55 Issue 11 Pages
1443-1449
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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An objective evaluation measure AWSNR that reflects human visual characteristics is proposed. In the measure, the spatial complexity of the original picture is determined from the fractal dimension, and the human visual sensitivity to the brightness of the picture is considered. Furthermore, subjective observation areas are predicted based on local complexity, local brightness, and the human spatial frequency characteristics. From experimental results using 350 pictures evaluated by 30 testers, it was found that the correlation coefficient between the MOS (Mean Opinion Score) and the proposed AWSNR became 0.91.
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Jinji Chen, Toshiharu Mukai, Yoshinori Takeuchi, Tetsuya Matsumoto, Hi ...
2001 Volume 55 Issue 11 Pages
1450-1459
Published: November 01, 2001
Released on J-STAGE: August 17, 2011
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We understand the environment by integrating information obtained by the senses of sight, hearing and touch. To integrate information across different senses, we must find the correspondence of events observed by different senses. This paper presents a general method for relating the audio-visual events of more than one movement (repetitive and non-repetitive movement) observed by one camera and one microphone. The method uses general laws without object-specific knowledge. As corresponding cues, we use Gestalt's grouping laws : simultaneity of the occurrence of the sound and the change in movement, and similarity of repetition between sound and movement. We conducted experiments in the real environment, and obtained satisfactory results showing the effectiveness of the proposed method.
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Toshikazu Matsui
2001 Volume 55 Issue 11 Pages
1460-1466
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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The correspondence between motion appearances and accommodative responses to multiple-drifting sine-waves has been examined to clarify whether the accommodation mechanism cooperates with the motion detection mechanism or not. The stimuli consisted of two or three sine-waves moving in opposite directions. Accommodative responses were measured using an infrared optometer while observers were paying attention to each component sine-wave's motion. The following results were obtained : (1) the motion appearance and the accommodative state are changed depending on which component sine-wave is paid attention to; (2) at each accommodative state, the attention-getting sine-wave's motion is perceived stably and correctly; (3) the accommodative state shifts to one direction (far or near) as the attention-getting sine-wave's spatial frequency decreases; (4) the above results are independent of viewing distance; (5) the amount of the retinal image's blur derived from our perceptual judgment does not always coincide with that derived from the accommodation lag; (6) the resting state of accommodation produces no effect on the accommodative responses. These results suggest that the accommodation mechanism is a cooperative system which interacts with the motion detection mechanism.
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Kaori Segawa, Hiroyasu Ujike, Shinya Saida
2001 Volume 55 Issue 11 Pages
1467-1471
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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The purpose of this study was to clarify the effects of head movement on the duration of motion aftereffect. We raise two hypotheses concerning the effects of head movement on the temporal tuning property. The first hypothesis is that the tuning functions sift toward larger adapting velocities for larger head movement velocities. The second hypothesis is that the functions sift downward over the entire range of the adapting velocity for larger head movement velocities. Using sinusoidal gratings, the duration of motion aftereffect was measured for various adapting velocities. An observer moved her/his head at one of five different velocities of head movement in the horizontal direction after being adapted to the vertical relative motion. The results indicated that the second hypothesis is positive. The results suggest that the larger velocity of head movement is the more the motion aftereffect is suppressed.
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Yuukou Horita, Yoshinao Kawai, Kazuhiro Honda, Tadakuni Murai, Mamoru ...
2001 Volume 55 Issue 11 Pages
1472-1478
Published: November 01, 2001
Released on J-STAGE: August 17, 2011
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The degradation in quality of stereoscopic image was evaluated subjectively as part of an effort to develop a method for evaluating the quality of coded stereoscopic color images. The mean opinion score was analyzed to determine the effect of the attentive eye from the viewpoint of stereoscopic vision. The result of an evaluation experiment shows that the effect of the attentive eye was not significant for coded stereoscopic image. Moreover, the overall quality of the stereoscopic image was degraded when the qualities of the left and right images differed. This means that the overall quality of the coded stereoscopic image was not evaluated by the average value of qualities of the right image and the left image. Finally, the overall quality of the coded stereoscopic image was evaluated synthetically both of the block noise of the background portion which has no disparity information and the distortion of the stereoscopic edge portion of the object.
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Joon Bo Shim, Yoshinori Takeuchi, Toshiharu Mukai, Noboru Ohnishi
2001 Volume 55 Issue 11 Pages
1479-1490
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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We describe a novel approach for recovering an exact 3D whole model using image sequences. To recover a whole shape, more than two images should be used, which is convenient to avoid problems such as inclusion of noise and self occlusion. We present the methods of
fusion and
integration of 3D shapes. The fusion process indicates that 3D partial shapes in the same viewpoint set are fused sequentially to improve accuracy. The integration process indicates that refined partial shapes by the fusion process in each viewpoint set are integrated to construct the whole shape with high accuracy. The novel iterative orthonormal fitting transform method (IOFTM) is utilized to transform the shapes' coordinate system to the standard one. IOFTM is compared with the steepest descent method. We fuse shapes by the point-weighted fusion method. The whole shape is constructed by the integration of partial shapes' points which are at lower noise level between corresponding feature points. The system is divided into five stages : first, reconstruction of partial shapes at different camera positions, second, fusion of the partial shapes to obtain a para-ideal shape by the uniform-weighted fusion method, third, detection of the outlier shapes and feature points based on evaluation function, fourth, fusion of shapes by the point-weighted fusion method, and fifth, integration of accurate partial shapes to construct the refined whole shape. Experimental results indicate that our system performs well in removing noise with robustness. The noise reduction rates are 85.8%-97.4% in the simulation and real image experiments, respectively.
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Hiroyasu Ujike, Katsunori Okajima, Shinya Saida
2001 Volume 55 Issue 11 Pages
1491-1498
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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We conducted two experiments to the depth information interaction among cast shadow, relative size, and blur to perceive dynamic depth changes. In the first experiment, we measured the extent of the perceived amplitude of the reciprocating motion-in-depth at six different temporal frequencies. In the second experiment, we measured the perceived time-to-contact for a target apparently approaching an observer at three different speeds. The results show that : (a) the extent of the reciprocating motion-in-depth is larger when combining pictorial information than when presenting the information individually, (b) the extent of the reciprocating motion-in-depth decreases for the higher temporal frequencies of the reciprocating motion, and (c) the perceived time-to-contact decreases with the combining of the pictorial depth information. The results indicate that for dynamic depth perception additive interaction occurs among pictorial information that are less powerful. Moreover, the frequency of motion-in-depth produced by using different depth information is limited by a common mechanism. These data will be useful for producing a virtual-reality environment effectively.
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Sasadara Kaluwahandi, Yoshiaki Tadokoro
2001 Volume 55 Issue 11 Pages
1499-1505
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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This paper describes a portable traveling support system that uses image processing to aid the visually impaired. We have already previously proposed a portable navigation system for the visually impaired. However. there are some places where this system is unable to provide the proper guidance. Since the travel direction of the user of this system is measured by a terrestrial magnetic sensor. there is a possibility that the wrong direction is measured. due to a distortion of the terrestrial magnetism caused by vehicles, etc. Road markings. e.g., pedestrian crossings, white lines of roadways. are reliable information that can be used to measure the correct direction. Furthermore, landmarks, e.g., electric poles. traffic-control signs and postal boxes. are also useful for a traveler to confirm his position. Therefore, we applied image processing to our portable navigation system to make it more reliable.
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Various Status Transmission Method Based on Vibration for Deaf/Blind and Visually Impaired Persons
Sakai Tadahiro, Ishihara Tatuya, Ito Takayuki, Isono Haruo
2001 Volume 55 Issue 11 Pages
1506-1514
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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We have been making progressing in the research and development of an integrated receiving terminal to enable the visually disabled and those with both visual and auditory disabilities to receive character information from data broadcasts and to communicate non-verbally via telephone. Tactile stimuli from the terminal, such as vibrations, must accurately convey to the user the response to a user input and the status of the communication on the telephone line as well as character data. In this report, to elucidate the requirements of tactile stimuli for accurate reception and intuitive learning of status messages, we discuss our investigation of the conditions under which vibration stimuli are distinguishable and under which condition they appear to convey the desired sensuous impression. We show that by using vibration stimuli matched to the user' s impression of various states of the receiver, such information can be conveyed intuitively and with little learning effort required of the user.
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Akira Tsukada, Yoshichika Baba, Kazuo Sasaki
2001 Volume 55 Issue 11 Pages
1515-1519
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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Akira Tsukada, Narunori Tada, Yoshichika Baba, Kazuo Sasaki
2001 Volume 55 Issue 11 Pages
1520-1522
Published: November 01, 2001
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Koji Sugimoto, Gosuke Ohashi, Yoshifumi Shimodaira
2001 Volume 55 Issue 11 Pages
1523-1526
Published: November 01, 2001
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Nobuyuki Ishibashi, Yoshitsugu Manabe, Kunihiro Chihara
2001 Volume 55 Issue 11 Pages
1527-1533
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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Kenji Yokoi, Keiji Uchikawa
2001 Volume 55 Issue 11 Pages
1534-1538
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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Kiyoshi Hoshino
2001 Volume 55 Issue 11 Pages
1539-1542
Published: November 01, 2001
Released on J-STAGE: August 17, 2011
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Seiji Hotta, Kohei Inoue, Kiichi Urahama
2001 Volume 55 Issue 11 Pages
1543-1546
Published: November 01, 2001
Released on J-STAGE: March 14, 2011
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