[in Japanese]

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[in Japanese]

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This paper introduces a fast rational Bézier curve generation method and an efficient antialiasing method. Spline, B-spline, Bézier, rational Bézier and conic curves are often used for object representation. They can all be transformed into rational Bézier curves. All parametric curves can be expressed by implicit equations. The error difference functions introduced here are used to generate curves. Calculation is very fast and simple, and is performed mainly by adding and shifting without multiplication. The anti-aliasing method is used to prevent jaggy. Computer simulation confirmed the effectiveness of our methods.

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Changes in binocular eye movement occur when a subject changes his/her gaze point from a far/near to a near/far target, requiring both symmetric and asymmetric vergence. We measured these changes to investigate the effects of aging on vergence eye movement. Results indicated increases in the latency and time constants of vergence eye movement, decreases in convergence angle changes, and increases in the number of corrective saccades in subjects over 50 years, and increases in time constants in subjects below 10 years, compared with data for subjects between 10 and 50 years. This suggests that young and older subjects do not have the same vergence eye movement characteristics as those between 10 and 50 years. These differences should be considered in research about a subject's depth perception of stereoscopic images.

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This paper introduces a method for constructing simple scene models and generating animation using pictures taken from different positions on the ground. These are then used for landscape simulation with computer graphics. Our method features a texture mapping process using a region division image of a natural scene and a way to synthesize images generated from more than one simple scene model. By applying this method to a natural scene, we confirm that the model can be used to compute the positional relationship among all objects in a scene. The synthesized montage images obtained were sufficiently realistic. We also generate animation to ensure our model can be used to make more elaborate images for landscape simulation.

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A one-inch X-ray vidicon (imaging camera tube) with a polycrystalline cadmium telluride (CdTe) photoconductive target has been developed. This vidicon has a 10.5μm thick CdTe layer deposited by RF sputtering and can attain an X-ray signal current of about 200 nA/cm² for 2.58 mC/kg/min (10R/ min). This value is higher than the 45 nA/cm² of conventional PbO X-ray vidicons. The dark current is about 5 nA/cm² at a target voltage of 35 V at room temperature. The resolution of the device exceeds 251p/mm (20μm). In addition, by using a sputtering technique which can obtain large and uniform film, simultaneous deposition of many conventional and large vidion targets can easily be performed.

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[in Japanese]

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