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Displaying 1-16 of 16 articles from this issue
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Article type: Cover
Pages Cover1-
Published: March 23, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (14K) -
Article type: Index
Pages Toc1-
Published: March 23, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (66K) -
Fumio Wada, Shun'ichi TanoArticle type: Article
Session ID: HIR2000-71
Published: March 23, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe network technology, multimedia applications and digital devices have been ubiquitous in our society. Most people have their own information appliances and can easily access to various information. Big changes are going to occur in every place such as our office, home, car and so on. The situation is problematic, however, because the human capacity for information processing is limited. So, it is impossible to manage the large mass of information. To cope with this limitation, we point out that it is important for the system to estimate the user's cognitive load and present the information at the most suitable combination of the media, modality and foreground/background degree. We propose the basic system architecture that gradually adapts to the characteristics of the individual cognitive capability.View full abstractDownload PDF (660K) -
Masakazu AKIBA, Tuneo KANNO, Yasuaki TERAMACHIArticle type: Article
Session ID: HIR2000-72
Published: March 23, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper describes the estimation of the age group based on the facial images of young men by using the neural network. First, we analyzed the data which measured the facial shape. The facial shape had been gradually changing from the infant age, and the age that the shape was completed was about 22 years old in the male, and about 15 years old in the female. Then, we experimented by using the facial images of male with a long changing span. Their ages were from 12 to 22 years old. The input data to the neural network used the mosaic features and the KL features. The neural network was able to classify those facial images into four age groups by using those features. Those identification rates were about 80%. The result of classifier which had used the KL feature was similar to the subjective impression which the person had evaluated. Moreover, the facial feature of each age group has been extracted by analyzing the connection weights between the hidden-layer unit and the input-layer units. The feature of each age group which had been obtained by the mosaic feature was a facial outline. The eigenface extracted by the KL feature showed the facial feature of each age group.View full abstractDownload PDF (708K) -
Hiroo Hara, Nobuyuki HirumaArticle type: Article
Session ID: HIR2000-73
Published: March 23, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSAccommodation responses of elderly subjects to binocular stereoscopic images were measured. The stimuli were generated by a PC and displayed on two LCDs and viewed through a stereoscope consists of four mirrors. The accommodation responses were measured using an infrared optometer and the data were recorded by the PC. As a result, it was found that contrary to young peopole, elderly subjects showed no or very small responses to the apparent depth movement of the binocular stereoscopic targets.View full abstractDownload PDF (803K) -
Shinya Abe, Kenji Susami, Yoshihiro Kajiki, Tomohiro Endo, Toyohiko Ha ...Article type: Article
Session ID: HIR2000-74
Published: March 23, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSEmploying the super multi-view (SMV) stereoscopic display, we measured vergence and accommodation in the old stereoscopic conditions and under SMV conditions. The stimuli were a vertical line and a radial pattern with the upper and lower parts presented at different distances from the observer: 1.75 and 2.13 diopters, respectively. In general, measurement of accommodative states was difficult because of disturbances of the measured light by eyelashes or hyperopia, in two of the three subjects. However, an appropriate convergence corresponding to distance was caused by all conditions. Moreover, the accommodation distance was not constant under the old stereoscopic conditions although the distance always corresponded to vergence under SMV conditions. These results suggest that accommodative stability of the eye was induced by super multi-view stereoscopic images.View full abstractDownload PDF (621K) -
Yuukou Horita, Yoshinao Kawai, Tadakuni Murai, Yoshio NakashimaArticle type: Article
Session ID: HIR2000-75
Published: March 23, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, we perform the comparison of the quality degradation between the coded stereoscopic image and its 2 dimensional imaage. This comparison was based on the MOS (Mean Opinion Score) which is obtained from the subiective evaluation experiment. The evaluation experiment of the 2 dimensional image was investigated for 3-D display system which was the same as the evaluation experiment of the stereoscopic image. As the result, the obtained visual quality of the stereoscopic image is better than it of the 2 dimensional image. Moreover, the total quality of the stereoscopic image is falling down when the quality of the left image and the right image has some difference.View full abstractDownload PDF (600K) -
Kazumichi Matsumiya, Keiji UchikawaArticle type: Article
Session ID: HIR2000-76
Published: March 23, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe relationship between attentional shift and the compression of visual space before saccadic eye movements was investigated using a dual-task paradigm that required a target-directed saccade in combination with a discrimination task. The performance in discriminating the feature and displacement of a target briefly presented before the saccade was taken as a measure of both attention and the compression of visual space. Our results show that the ability of the feature discrimination is facilitated but the ability of the displacement discrimination is degraded when the saccade target is referred to the discrimination stimulus. Also, our results show that an object is not reduced by the compression of visual space before the saccade. It is suggested that attentional mechanism is independent of the mechanism of the compression of visual space.View full abstractDownload PDF (723K) -
Masami Ishihara, Shigeru Ichihara, Shigemasa SumiArticle type: Article
Session ID: HIR2000-77
Published: March 23, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe measured the velocity of the motion aftereffect (MAE) caused by adaptation to a drifting sinusoidal luminance grating or an equiluminous chromatic grating by making use of two methods (matching, or nulling). The effect of spatial frequency regarding adapting and test stimuli, and that of velocity regarding adapting stimulus were also investigated. This study showed that the MAE velocity was not affected by the difference of the methods for the chromatic grating, whereas it was partly affected by the difference of the methods at some spatial frequencies for the luminance grating. The effect of adapting velocity was observed at the low spatial frequency conditions for the luminance grating. but not observed for the chromatic grating. Moreover, a significant interaction between the adapting and test spatial frequencies for the luminance grating was appeared. The properties of a luminance and a color channels in visual system were discussed.View full abstractDownload PDF (881K) -
Yoshiko NAKAGAWA, Toshiko MOTIDUKI, Shigemasa SUMIArticle type: Article
Session ID: HIR2000-78
Published: March 23, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe examined whether the effective visual field to identify target figure would be enlarged by the prime stimulus, which is presented at the central field of view. The target was presented from 1.00 to 9.25deg. of horizontal eccentricity. In experiments I and II, we varied the type of information given just prior to presentation of a geometric target figure, and we analyzed the reaction time and percent of correct responses to identify target under several conditions. By experiment I, it was found that direct prime information in the form of the target figure itself (Match condition) provided more spatial and temporal effects at the non-Match condition. Experiment II showed that semantic prime information in the form of figure's name by characters was also most effective than other conditions, but it was only for temporal aspect.View full abstractDownload PDF (849K) -
Ikuko Kamada, Koichi Oda, Shigemasa SumiArticle type: Article
Session ID: HIR2000-79
Published: March 23, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn the Kanizsa figure subjective contour changes, as the angle of the inducing elements gets more and more acute, it changes a square into an X-shape. In Exp.1 the shape of the subjective contour changed to an angle of 45 degrees across all radius conditions, but the average threshold angle tended to be smaller with smaller radii. In Exp.2, temporal order effect on subjective contour was examined. Clearer contour was perceived when the inducing elements were successively presented in rotation than in cross, in CW direction than in CCW, and when their duration and ISI became shorter.View full abstractDownload PDF (563K) -
Naoko Suzuki, Keiji UchikawaArticle type: Article
Session ID: HIR2000-80
Published: March 23, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe studied perceptual specularity changing by color changing, which is thought that it have influence to perceptual specularity. In our experience, we used cylinder shaped specimens which color was black. And it was put on upon another by light which had some hue, lightness and saturation value. In conclusion, we found that hue has nothing to change perceptual specularity, and if perceptual specularity by component of specular reflection was low then the more lightness low, or the more saturation high, the more perceptual specularity high. Component of specular reflection has bigger affect to perceptual specularity, next is lightness and the lowest at the three is saturation.View full abstractDownload PDF (691K) -
Mari Asakura, Yumi Ikeda, Shigemasa SumiArticle type: Article
Session ID: HIR2000-81
Published: March 23, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSMcGurk and MacDonald (1976) reported that the mismatch between the auditory signal of natural speech and the visual signal of speaker's lip movements created a third phoneme differently from both of the auditory and visual signals. The fact is called the McGurk effect. In the present study, it was examined that, if landscape and soundscape were mismatched, the McGurk effect would generate the third scenic image perception or not. In Experiment, different visual scenic images and different sound street noises were combined with each other. Observing the stimulus images of still ones on a screen (Exp.1), on a computer display (Exp.2), and video-taped movie ones on TV monitor (Exp.3), participants of the undergraduates evaluated their impressions. Results revealed that, in general, the scenic image perception was visually dependent and that McGurk effect was seen when visual images were insufficient for providing enough information about recognizing the scenic contents.View full abstractDownload PDF (601K) -
Naoyuki Matsuzaki, Hiroaki Shigemasu, Nobuaki Ito, Kazuhiko YokosawaArticle type: Article
Session ID: HIR2000-82
Published: March 23, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe made use of the LAN (Local Area Network) of the University of Tokyo for the exercise for the psychological experiment. We applied Java and CGI. It was shown that the experiment which many people can participate in at the same time is possible. The result indicates the possibility of the cognitive psychological experiment which target the unnamed people on the internet.View full abstractDownload PDF (735K) -
Fumio Okuyama, Kazunori Shimizu, Yusuke Kawabe, Seo Hwa Joung, Nagamas ...Article type: Article
Session ID: HIR2000-83
Published: March 23, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSFor this experiment we inputted medical items into clinical medical records using automatic speech recongition software. We adopted two documents for this experiment. One was a 175 word newspaper article and the other was medical interview between a doctor and a patient. Speech recognition was performed with and without an individual voice registered. The two documents were read to five college students. The recognition rate was 96% for the newspaper article and 89% for the interview.View full abstractDownload PDF (534K) -
Article type: Appendix
Pages App1-
Published: March 23, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (88K)
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