One strategy would be to directly represent the Poisson effect by generating a representation of the physical properties of elastic materials. There are two possible strategies used by human observers to assess causality in the deformation. To date, however, it has remained unclear how human observers combined the horizontal extension and vertical compression in the Poisson effect to judge the apparent causality of such deformations. For example, it is common to experience that when we stretch fabric horizontally, the fabric is vertically compressed. In our daily life, human observers do not feel the Poisson effect is an unusual phenomenon. The size of the Poisson effect is described by Poisson’s ratio ν, which is derived from the following formula, Usually, the magnitude of compression is smaller than the magnitude of extension. This physical phenomenon is called the Poisson effect.
For example, when an extension force is applied to an elastic material along a single spatial axis, the material is at the same time compressed along the orthogonal axis (Fig. In this way, human observers make use of static and dynamic image characteristics to assess the physical properties of objects and materials in the world.Ī next important step in the research in material perception is to investigate how well human observers understand the physical behavior of materials. The assessment of elasticity for jelly-like materials is likely made on the basis of image parameters such as motion and shape 6, 7, 8. Recent studies 4, 5 showed that the observers adroitly used image motion characteristics to discriminate the cloth’s stiffness. Human observers are also good at discriminating the stiffness of cloth such as silk and cotton. For example, the assessment of liquid viscosity is clearly explained in terms of image motion characteristics 1 and/or mid-level image features 2, 3. Previous studies have reported the visual information that contributed to discrimination of physical properties. In everyday life, human observers easily discriminate such physical properties of a material as viscosity, elasticity, plasticity, and so forth.
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