Abstract: In order to solve the problem of the limited measuring range and complicated camera calibration, this paper proposes a novel approach for 3D reconstruction based on the decorrelation of the speckle patterns. First, when coherent light is transmitted from a rough surface, the speckle pattern is produced by the mutual interference of a set of wavefronts; then, estimates the range of the object by using the decorrelation properties of the reference images at different positions; at last, the region of displacements as a reference can be obtained by triangulation to determine the profile of a certain 3D object. Simulation results show that the depth map can be realized within the allowed range. A significant advantage of the method is the absence of shadowed area and high configurability.

Key words: laser speckle, 3D reconstruction, decorrelation, triangluation