[in Japanese]

View full abstract

[in Japanese]

View full abstract

A short back-fire antenna combined with a two-stacked circular loop Yagi-Uda array antenna with a metal reflector plate is analyzed by a proposed theoretical model.
Several computed curves for two-element back-fire antennas are given, and the values computed for current distributions and radiation characteristics are substantiated by experiments. Radiation characteristics are investigated to obtain a desirable configuration.
Optimum spacing L, between stacked loops, and optimum distance d, between the Yagi-Uda array antenna and metal reflector plate, are discussed in detail. and An optimally configured two-element Yagi-Uda two-stacked circular loop array back-fire antenna is experimentally examined.

View full abstract

Colorimetric design of the conventional television system has been based on colors of the CRT and the standard illuminant, characteristics of video cameras were decided according to their chromaticity values. Because LED and LCD display panels used for full-color display have different color characteristics, new design parameters should be considered. Since conventional video cameras are used for the present system, another design is necessary for both CRT and LED displays to be used.
This paper proposes a new method for converting colorimetric information to give optimal color reproduction. It applies the method of least squares to color differences between original and reproduced colors. Conversion parameters are obtainable by solving a ninth-order simultaneous linear equation. Since the equation is expressed dependent of the spectral characteristics of LED's, its solution is general and applicable to other cases.

View full abstract

In this paper we describe a method for measuring binocular eye movement when a static random-dot stereogram (RDS) and a dynamic RDS is shown to a subject. Eye movement is measured by an image-processing technique using the image sequence of binocular fundus taken by an infra-red television fundus camera. We regarded eye movement as papillary movement. To detect the papillary position, we performed template matching (SSDA method) between a template image containing the papilla obtained from the first input image and the succeeding input images. We thereby measured the eye movements in horizontal and vertical directions. Vergent eye movement (vergence) can be observed after stereoscopic perception rather than when searching for a corresponding point.
We also tried three-dimensional display of the eye viewpoints to see where on the RDS the subject gazed.

View full abstract

We propose a new method of color image quantization using flexible color space clustering to allow user to dynamically control the color selection. The system first uses spheres with radius D, which can be changed by users through a conversation with the system, to divide the L⁺u⁺v⁺ color space and allocate the same color to the pixels whose colors belong to the same sphere. The system then allows users to specify several areas to be emphasized and allocate more colors to those areas by using smaller spheres to divide the color space of those areas. Finally, to specify the colors to be emphasized accurately, the system provides four 'templates' to the users.
Several experimental results in which the images of 2²⁴ colors are quantized to 16-color images show the effectiveness of the proposed method.

View full abstract

It is very difficult to get the stereoscopic effect at both sides of a screen from a pair of stereo images in a small field of view. This is because at these sides, a part of an object seen by the right eye cannot be seen by the left one, and vice versa. We propose a method, called stereo clipping, for confining the displayed object within the view range of both eyes. Stereo clipping is acheved using a Cohen-Sutherland, Sutherland-Hodgman, or other algorithm. Visual tests verify that stereo clipping has a visual effect.

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract