Kenichiro Tanaka

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Most current interface designs require that the user focus their attention on them in order to be of value. However, as the price of computation falls, and computational capabilities make their way into many everyday objects, the demand for attention from many different directions may begin to seriously reduce the usefulness of these computational objects.(More)
It is well known that paper is a very fluid, natural, and easy to use medium for manipulating some kinds of information. It is familiar, portable, flexible, inexpensive, and offers good readability properties. Paper also has well known limitations when compared with electronic media. Work in hybrid paper electronic interfaces seeks to bring electronic(More)
User interface components such as buttons, scrollbars, menus, as well as various types of containers and separators, normally need to be resizable so that they can conform to the needs of the contents within them, or the environment in which they are placed. Unfortunately, in the past, providing dynamically resizable component appearances has required(More)
The inner structure of an object can be measured by capturing transmissive images. However, recorded images of a translucent object tend to be unclear due to strong scattering of light inside the object. In this paper, we propose a descattering method based on Parallel High-frequency Illumination. We show in this paper that the original high-frequency(More)
Translucent objects have complex appearance. It is a superposition of light rays emitted from inner slices at every depths, blurred by subsurface scattering. Because visualizing internal structure of objects is of broad interest in medical and art analyses and industry inspection, various imaging techniques have been developed in the past. In particular,(More)
This paper presents a method for recovering shape and normal of a transparent object from a single viewpoint using a Time-of-Flight (ToF) camera. Our method is built upon the fact that the speed of light varies with the refractive index of the medium and therefore the depth measurement of a transparent object with a ToF camera may be distorted. We show(More)
In this paper, we describe a supervised four-dimensional (4D) light field segmentation method that uses a graph-cut algorithm. Since 4D light field data has implicit depth information and contains redundancy, it differs from simple 4D hyper-volume. In order to preserve redundancy, we define two neighboring ray types (spatial and angular) in light field(More)
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