Active inspection of objects to detect possible damage and measure their volume using 3D reconstruction

Riffo, Vladimir; Hidalgo, Rodrigo

doi:10.1016/j.measurement.2022.111541

Cited by 5 publications

(1 citation statement)

References 17 publications

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“…The most common implementations are based on time-of-flight (TOF) and triangulation principles; such systems have gained a lot of traction in recent decades. The simple active system is laser triangulation [10][11][12][13], a light source such as laser strip line is utilized, projecting onto an object, the reflected laser strip line is detected by a camera frame by frame, in sync with the conveyor belt position while it is still moving. During this process, an analysis of the distortions of the laser strip line is performed to obtain the depth information, and then 3D information of the object is reconstructed.…”

Section: Introductionmentioning

confidence: 99%

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

Suesut

2024

IJEETC

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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.

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Section: Introductionmentioning

confidence: 99%