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Innovative machine vision technique for 2D/3D
complex and irregular surfaces modelling

Anwar, Shahzad; Smith, Lyndon; Smith, Melvyn

Innovative machine vision technique for 2D/3D
complex and irregular surfaces modelling Thumbnail


Authors

Shahzad Anwar

Lyndon Smith Lyndon.Smith@uwe.ac.uk
Professor in Computer Simulation and Machine

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Melvyn Smith Melvyn.Smith@uwe.ac.uk
Research Centre Director Vision Lab/Prof



Abstract

Abstract—This study propose and demonstrates a novel technique incorporating multilayer perceptron (MLP) neural networks for feature extraction with Photometric stereo based image capture techniques for the analysis of complex and irregular 2D profiles and 3D surfaces. In order to develop the method and to ensure that it is capable of modelling non-axisymmetric and complex 2D/3D profiles, the network was initially trained and tested on 2D profiles, and subsequently using objects consisting of between 1 and 4 hemispherical 3D forms. To test the capability of the proposed model, random noise was added to 2D profiles.
3D objects were coated with various degrees of coarsenesses
(ranging from low-high). The gradient of each surface normal
was quantified in terms of the slant and tilt angles of the vector about the x and y axis respectively. The slant and tilt angles were obtained from the bump maps and these data were subsequently employed for training of a NN that had x and y as inputs and slant and tilt angles as outputs. The network employed had the following architecture: MLP and a Levenberg-Marquardt algorithm (LMA) for training the network for 12,000 epochs. At each point on the surface the network was consulted to predict slant and tilt and the actual slant and tilt was subtracted, giving a measure of surface irregularity. The network was able to model the underlying asymmetrical geometry with an accuracy
regression analysis R-value of 0.93 for a single 3D hemispheres and 0.90 for four adjacent 3D non-axisymmetric hemispheres.

Citation

complex and irregular surfaces modelling. International Journal of Computer Science Issues, 9(5), 113-121

Journal Article Type Article
Publication Date Sep 1, 2012
Deposit Date Jan 22, 2013
Publicly Available Date Mar 31, 2016
Journal International Journal of Computer Science Issues
Print ISSN 1694-0784
Publisher IJCSI Press
Peer Reviewed Peer Reviewed
Volume 9
Issue 5
Pages 113-121
Keywords machine vision technique, 2D/3D, complex and irregular surfaces modelling
Public URL https://uwe-repository.worktribe.com/output/944262

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