Abstract

SALAZAR, AUGUSTO; SANCHEZ, LUIS GONZALO  and  PRIETO, FLAVIO. A RANGE IMAGE ACQUISITION SYSTEM BASE ON ACTIVE-STEREO. Dyna rev.fac.nac.minas [online]. 2007, vol.74, n.153, pp.301-311. ISSN 0012-7353.

In the present work, we describe a low cost active system to acquire range images implemented on MATLAB®. The system combines parameter estimation techniques when two views are provided (uncalibrated methods are considered as well as calibrated methods). We start by defining an uncalibrated system where camera orientations and positions are mainly unknown. After capturing a calibration rig by two uncalibrated cameras, we can estimate the fundamental matrix F and the two camera matrices P₁ and P₂. This matrices combined establish the spatial configuration of the setup and other relevant parameters. To acquire real objects, we constrain the search area for finding correspondences in two views by simply projecting a line onto the object. Since two views of the object are available, no considerations about calibration and position estimation of the structured light source are necessary. Nevertheless, considerations about noisy estimation of correspondences are necessary to assess the system’s accuracy.

Keywords : stereo; camera calibration; epipolar geometry; 3D reconstruction.

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