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IJEETC 2024 Vol.13(2): 176-183
doi: 10.18178/ijeetc.13.2.176-183

A Fast and Simple Machine Vision Framework for Approximating the Volume of Axi-Symmetric Objects Using Shadow Ray Casting

Siwakorn Sukprasertchai, Taweepol Suesut*, and Navaphattra Nunak
School of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, Thailand
Email: siwakorn.su@ku.th (S.S.), taweepol.su@kmitl.ac.th (T.S.), navaphattra.nu@kmitl.ac.th (N.N.)
*Corresponding author

Manuscript received September 13, 2023; revised October 29, 2023; accepted November 7, 2023.

Abstract—The volume measurement using machine vision system is contactless techniques that play an important role in industries now a day. Basically, three-dimensional reconstruction is required to determine a depth using a special lighting system or multiple cameras. This increases the complexity of the measurement system. A fast and simple machine vision framework called RayVol for estimating the volume of axisymmetric objects in near real-time using a single camera and simple illumination is presented. The RayVol framework employs a shadow casting method to reconstruct the 3D shape of the object by tracing rays from the object’s shadow pixels to the light source location. The result of this technique shows a significant accuracy improvement from the area-projection method. A virtual slice representing the cross-section of an object is reconstructed using a cubic spline approximation from baseline points derived from the boundary pixels of the object image and a shadow casting method. The volume estimation was calculated by restricted integration using the Riemann sum estimation algorithm, and the closed area of the virtual slices was calculated using the shoestring algorithm. Mangoes were used as a case study of the RayVol framework. The volume estimation provides the correlation coefficient of 0.9849 between the developed system and the water replacement method.

Index Terms—3D reconstruction, non-contact volume approximation, shadow casting

Cite: Siwakorn Sukprasertchai, Taweepol Suesut, and Navaphattra Nunak, "A Fast and Simple Machine Vision Framework for Approximating the Volume of Axi-Symmetric Objects Using Shadow Ray Casting," International Journal of Electrical and Electronic Engineering & Telecommunications, Vol. 13, No. 2, pp. 176-183, 2024. doi: 10.18178/ijeetc.13.2.176-183

Copyright © 2024 by the authors. This is an open access article distributed under the Creative Commons Attribution License (CC BY-NC-ND 4.0), which permits use, distribution and reproduction in any medium, provided that the article is properly cited, the use is non-commercial and no modifications or adaptations are made.