View Point Tricks for Visual Distortion of Photographs K Sugihara |
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Graduate School of Advanced Math. Sci., Meiji University, Japan
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| Photographs sometimes give an impression of the depth of a scene different from reality. One of basic origins of this kind of visual phenomena is the difference between the lens center at which we take photographs and the view point at which we see the photographs. We investigate the relationships between the visual distortion of the depth perceived from a photograph and the difference of the view point from the lens center from a geometric point of view. In particular, we point out that there are two main tricks by which we can give incorrect impressions of the depths through photographs. One is the use of special lenses such as telephoto lens and wide-view lens. The other is the overlay of two or more photographs into a single image. A single image lacks information about the depth of a scene, and hence there are infinitely many possible interpretation of the depth. However, we usually perceive the depth without ambiguity. This nature of our perception may be explained by the assumption that we prefer the most symmetric shape. This assumption together with the tricks of the view point can explain the visual phenomena of depth distortion. |
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