A method for depth sensing based on sensing the visibility associated with the coherence function of a laser source is presented. The setup is based on an electronic speckle pattern interferometric (ESPI) setup, where the object depth is encoded into the amplitude of the interference pattern without the need for depth scanning. After performing phase-shifting method, the object three-dimensional (3-D) shape is reconstructed by means as a range image from the visibility of the image set of interferograms and where each gray level represents a given object depth. Experimental results validate the proposed approach for reflective diffuse objects at different measurement distances.
Bibliographical noteFunding Information:
Part of this work was supported by the Spanish Ministerio de Educación y Ciencia under the project FIS2007-60626 and by Instituto de la Mediana y Pequeña Industria Valenciana under the project IMIDIC/2008/52 .
- Coherence coding
- Phase shifting speckle interferometry
- Three-dimensional mapping