Abstract
Fractal geometry was applied to describe the laser-speckle pattern by the diffused laser light scattered reflectively from a metallic standard rough surface. The fractal dimension method with a gray scale was used in this presentation. The calculated results suggest that the fractal characteristics actually exist in the laser-speckle patterns. The fractal dimension and the lacunarity feature as well are related to the surface roughness and its style. In the same style, the fractal dimension decreases while the roughness increases. Conversely, the lacunarity increases along with the roughness increasing. On the other hand, as to the same roughness, the fractal dimension and the lacunarity feature are different to the different style, respectively. Therefore, the fractal dimension and the lacunarity feature can be used as new characteristic parameters to determine the roughness of surface. This fractal method can also be developed to be a non-invasive detection for optical property of scattering media such as biological tissue.
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