NDLI: Improving 3D reconstruction accuracy in wavelet transform profilometry by reducing shadow effects

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Volume 14 (2020) : Issue 1, Jan

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Improving 3D reconstruction accuracy in wavelet transform profilometry by reducing shadow effects

Content Provider	IET Digital Library
Author	Torres, Claudia Victoria López Colores, Sebastián Salazar Kells, Kevin Ortega, Jesús Carlos Pedraza Arreguin, Juan Manuel Ramos
Abstract	Wavelet transform profilometry is a three-dimensional (3D) reconstruction method based on the structured light technique of fringe pattern projection, widely used because it is a non-invasive, high-performance 3D reconstruction method. The presence of shadows created by the object in the image capture process is an obstacle in obtaining accurate 3D reconstructions, as they add noise to the phase data, leading to artefacts in object reconstruction, even when using robust phase-unwrapping algorithms. Since shadows present diverse intensities and shapes, detecting and eliminating their effects are challenging tasks. This work presents a novel method to detect shadow regions and reduce their effects in 3D reconstruction. The proposed method uses coloured fringe patterns to detect the shadows and mathematical morphology to condition the outlines of the shadow regions. The shadow outline information is used to interpolate the background-plane fringe pattern onto the captured scene, where the shadows are detected. The mean squared error (MSE) of the reconstructed objects is reduced to 25% of the MSE without shadow removal, on an average, when using the Bioucas phase-unwrapping method. When using the Ghiglia phase-unwrapping method, the MSE reduction is to 8.3%, on an average, of the MSE in the shadow case.
Starting Page	310
Ending Page	317
Page Count	8
ISSN	17519659
Volume Number	14
e-ISSN	17519667
Issue Number	Issue 2, Feb (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-ipr/14/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-ipr.2019.0854
Journal	IET Image Processing
Publisher Date	2019-10-22
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	3D Reconstruction Accuracy Accurate 3D Reconstructions Background-plane Fringe Pattern Bioucas Phase-unwrapping Method Coloured Fringe Pattern Computer Vision And Image Processing Technique Diverse Intensities Fringe Pattern Projection Ghiglia Phase-unwrapping Method High-performance 3D Reconstruction Method Image Capture Process Image Colour Analysis Image Reconstruction Integral Transforms in Numerical Analysis Interpolation And Function Approximation Mean Square Error Method MSE Numerical Analysis Object Reconstruction Optical, Image And Video Signal Processing Phase Data Reconstructed Objects Robust Phase-unwrapping Algorithm Shadow Case Shadow Effect Shadow Outline Information Shadow Region Shadow Removal Shape Measurement Spatial Variables Measurement Structured Light Technique Surface Band Structure Surface Electron Density of State Surface State Three-dimensional Reconstruction Method Wavelet Transform Wavelet Transform Profilometry
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering Computer Vision and Pattern Recognition Software

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