86.プリズム式実体鏡とその応用
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Prism-type stereoscope, made by the author, has two wedge prisms instead of two convex lenses of the Brewster-type stereoscope, set the thinner sides inner (Fig. 1). Using this tool, we can observe two big plates, for instance each twice as large as this report paper, fused stereoscopically. We can draw stereogram, such as trimetric representation of factor loadings (Fig. 2), or random dot stereogram (Fig. 3), on a display screen of a computer, and observe it immediately. If we repeat to draw on the screen the stimulus set a and set b of Fig. 4 (or Fig. 5) alternately and observe it without the stereoscope, the central bars (or the black discs) are seen going closer and farther to each other. But with this stereoscope, a central bar (or a black disc) is seen going back and longer (or larger), and coming forth and shorter (or smaller). At first glance we feel there is a kind of illusion, as the same object decreases its size when it comes nearer to the observer, and increases its size when it goes back from the observer. This phenomenon may come out as follows: The stimulus objects which bring about the apparent object have the same sizes and, in consequence contain the same visual angles, only the location of the apparent object is nearer or farther to the observer by the stereoscopic observation of the objects. Then the apparent size of the object is proportional to the perceived distance of the object from the observer (Fig. 6), just in the same way as the size of an after-image is proportional to the projecting distance of it.
- 東京女子大学の論文
- 1989-03-15
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