In the year 2000 the reform of helthcare system will be scheduled by Japanese government. The reform will request functional assignments of helthcare facilities and efficient management of helthcare resources. Helthcare information management system will assist this reform. This systems aim toward collection, processing and utilization of people's helthcare information during their whole life. Their basic technologies are security technology, secured digital storage, transfer information faithful to originals via network, secured integration of distributed database and computer assisted diagnosis. ISCL protocol using smart cards are most important technology in these area.
In this paper, we name the action of browsing 3D virtual space in human scale virtual environment using scrolling technique "space browsing", and propose space browsing interface system based on estimating user's head posture. Head posture estimation is carried out in real-time by processing image of an oval marker put on user's head. Because the oval marker is attached on a cap, a user can put on the marker easily and naturally by just wearing the cap. Our method gives natural feeling to a user because the direction of scrolling has good consistency to user's direction of attention. We made experiment in which space browsing interfaces based on mouse and our method are compared, and the result shows that our method gives shorter task completion time.
We developed a human-scale system which enable person to manipulate virtual objects by intuition with both hands. Though the system represented hands as single points, there were some troubles to manipulate objects in the virtual environment. We propose a method to represent hands as discs. But the system only knows the 3 dimentional points, so we decide the direction of the discs, using a presumption of person's intention with distribution maps of probability. We also developed a system which recognise hands as discs, and made a experiment to show a model of discs superior than one of points.
In this paper, we describe a new video browsing method for the World Wide Web and our experience in applying the method to an education system for elevator maintenance engineers. This video browsing method features : (1) automatic scene-change detection and visual editing function for defining video structure, and (2) automatic generation of tree-structured HTML catalogs based on the defined video structure. Effectiveness of the method was confirmed in the education system for the elevator maintenance engineers.
Crystaline-lens cataract occurs as a result of aging of ocular media, which brings change in specturm of light falling on retina. We examined the effect of cataract on color perception by comparing color vision performances of young obsrevers with and without a glasses (simulating difference in spectral transmittance of clystaline-lens of 80yrs and 20yrs) in several psychophisical methods. Our result suggests that when young observer wares this special glasses, only flicker-sensitivity showed changes consistent to spectrum change on the retina. Other color vision showed smaller changes than expected from the change in spectrum. However, these changes do not coincides to the changes in color vision of actual aged-observers (Shefrin and Werner, 1993 ; Kraft and Werner, 1994). Therefore, some change in neural mechanisms in higher order visual system may play a significant role in changes of color vision mechanisms across aging.
A system for natural color reproduction has been developed in order to reproduce the original color of the object in telemedicine system. In this method, illumination difference between image capturing site and observing site is corrected, and natural color image is reproduced using multispectral image. To apply the method to practical telemedicine system, we develop a method to reduce the number of color bands of camera, as well as a simple method to acquire the illumination condition. Concrete way for practical use in telemedicine system is also investigated. Color reproduction experiment using human hands show the effectiveness of the proposed methods. Through the experimental results, the relationship between estimated color error and the number of color bands are also examined.