One Shot Optical 3d Surface Reconstruction of Weak Textured Objects for an Agricultural Application

Optical 3D measurement is meaningful in numerous industrial applications. In various cases, the objects to be measured moreover contain only sparse or even no texture. Predestinated examples are agricultural products like peeled potato tubers as well as industrial repetition parts made of plastic or ceramic, such as housing parts or ceramic bottles. These parts are often conveyed in a wobbling way during the automated optical inspection. Thus, conventional 3D shape acquisition methods like laser scanning might fail. In this paper, a novel approach for acquiring 3D shape of weak textured and moving objects is presented. It is primarily intended for automated optical quality assurance in field of agricultural processing industry. To facilitate such measurements, an active stereo vision system with structured light is proposed. The system consists of multiple camera pairs and auxiliary laser pattern generators. The shape acquisition is performed within one shot and is therefore beneficial for rapid inspection tasks. An experimental setup, including hardware and software, has been developed and implemented. Index Terms – automated inspection, optical, imaging, quality assurance