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Area and volume measurements of objects with irregular shapes using multiple silhouettes

Area and volume measurements of objects with irregular shapes using multiple silhouettes,10.1117/1.2166847,Optical Engineering,Joseph Eifert,Pengcheng

Area and volume measurements of objects with irregular shapes using multiple silhouettes   (Citations: 4)
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Surface area and volume measurements provide important information for agriculture and food-processing applications. A machine vision system that uses a nondestructive method to measure volume and surface area of objects with irregular shapes is presented in this paper. The system first takes a series of silhouettes of the object from different directions by rotating the object at a fixed angular interval. The boundary points of each image are then extracted to construct a silhouette.Athree- dimensional wire-frame model of the object can be reconstructed by in- tegrating silhouettes obtained from different view angles. Surface area and volume can then be measured by means of surface fitting and ap- proximation on the wire-frame model. System calibration and surface approximation were two major challenges for the design of this machine vision system. A unique centerline calibration method is introduced in this paper. Surface approximation and calculation are also discussed. Ex- amples of applications in agriculture and food processing using this vi- sion system for surface area measurement are included, and its accu- racy is verified.
Journal: Optical Engineering - OPT ENG , vol. 45, no. 2, 2006
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