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4th Eurographics Workshop on 3D Object Retrieval, 3DOR 2011

作者： Rodrigues, M.A. Robinson, A. GMPR Geometric Modelling and Pattern Recognition Research Group Sheffield Hallam University Sheffield United Kingdom

ISBN: (纸本)9783905674316

The main contribution of this paper is to present a novel method for automatic 3D face recognition based on sampling a 3D mesh structure in the presence of noise. A structured light method using line projection is employed where a 3D face is reconstructed from a single 2D shot. The process from image acquisition to recognition is described with focus on its real-time operation. recognition results are presented and it is demonstrated that it can perform recognition in just over one second per subject in continuous operation mode and thus, suitable for real time operation. © The Eurographics Association 2011.

关键词： Face recognition

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A Novel Steganography Approach for Audio Files

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SN Computer Science 2020年第2期1卷 1-13页

作者： Abdulrazzaq, Sazeen T. Siddeq, Mohammed M. Rodrigues, Marcos A. Computer Engineering Department Technical College/Kirkuk Northern Technical University Kirkuk Iraq GMPR-Geometric Modelling and Pattern Recognition Research Group Sheffield Hallam University Sheffield United Kingdom

We present a novel robust and secure steganography technique to hide images into audio files aiming at increasing the carrier medium capacity. The audio files are in the standard WAV format, which is based on the LSB algorithm, while images are compressed by the gmpr technique which is based on the Discrete Cosine Transform and high-frequency minimization encoding algorithm. The method involves compression–encryption of an image file by the gmpr technique followed by hiding it into audio data by appropriate bit substitution. The maximum number of bits without significant effect on audio signal for LSB audio steganography is 6 LSBs. The encrypted image bits are hidden into variable and multiple LSB layers in the proposed method. Experimental results from observed listening tests show that there is no significant difference between the stego-audio reconstructed from the novel technique and the original signal. A performance evaluation has been carried out according to quality measurement criteria of signal-to-noise ratio and peak signal-to-noise ratio. © 2020, The Author(s).

关键词： 2D image compression Audio steganography Binary search algorithm DCT LSB Matrix minimization

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An intelligent real time 3D vision system for robotic welding tasks

An intelligent real time 3D vision system for robotic weldin...

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2013 9th International Symposium on Mechatronics and Its Applications, ISMA 2013

作者： Rodrigues, M. Kormann, M. Schuhler, C. Tomek, P. GMPR - Geometric Modelling and Pattern Recognition Group Sheffield Hallam University United Kingdom TWI-Welding Institute Cambridge United Kingdom MFKK - Invention and Research Center Services Budapest Hungary

ISBN: (纸本)9781467350167

MARWIN is a top-level robot control system that has been designed for automatic robot welding tasks. It extracts welding parameters and calculates robot trajectories directly from CAD models which are then verified by real-time 3D scanning and registration. MARWIN's 3D computer vision provides a user-centred robot environment in which a task is specified by the user by simply confirming and/or adjusting suggested parameters and welding sequences. The focus of this paper is on describing a mathematical formulation for fast 3D reconstruction using structured light together with the mechanical design and testing of the 3D vision system and show how such technologies can be exploited in robot welding tasks. © 2013 IEEE.

关键词： Intelligent robots

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Efficient 3D data compression through parameterization of free-form surface patches

Efficient 3D data compression through parameterization of fr...

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作者： Rodrigues, Marcos A. Robinson, Alan Osman, A. Geometric Modelling and Pattern Recognition Research Group Sheffield Hallam University Sheffield United Kingdom

ISBN: (纸本)9789898425195

This paper presents a new method for 3D data compression based on parameterization of surface patches. The technique is applied to data that can be defined as single valued functions;this is the case for 3D patches obtained using standard 3D scanners. The method defines a number of mesh cutting planes and the intersection of planes on the mesh defines a set of sampling points. These points contain an explicit structure that allows us to define parametrically both x and y coordinates. The z values are interpolated using high degree polynomials and results show that compressions over 99% are achieved while preserving the quality of the mesh.

关键词： Parameterization

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Producing animations from 3D face scans

Producing animations from 3D face scans

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6th International Conference on Intelligent Games and Simulation, GAME-ON 2005

作者： Robinson, Alan Rodrigues, Marcos A. Alboul, Lyuba Geometric Modelling and Pattern Recognition Group Materials and Engineering Research Institute Sheffield Hallam University Sheffield SI 1WB United Kingdom

ISBN: (纸本)9077381236

In this paper we take our existing research into 3D surface scanning using uncoded structured light, optimized for human faces, and develop a method to record a sequence of face movements and visualise these as an animation in real time;we call this method the 3D Animation Processor (3DAP). The applications for this work include 2D and 3D face recognition, broadcast and feature film animation, and computer games production. It should be stressed that the 3D recording of facial movements in real time is a difficult problem that is attracting considerable research attention;but accurate and appealing results have so far proved elusive. We record the faces of a number of speaking subjects, process the data representing their shape and colour as it changes over time, and visualise the animated face models. We identify a particular problem in frame continuity, whereby unacceptable jumps and jitters occur in both the shape of the face and its colour mapping, and begin to solve this problem using hole-filling and interframe interpolation. We also investigate methods of feature tagging, so that the model can be placed in a fixed coordinate system and thereby incorporated into computer generated animations.

关键词： Animation

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Efficient 3D data compression through parameterization of free-form surface patches

Efficient 3D data compression through parameterization of fr...

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International Conference on Signal Processing and Multimedia Applications (SIGMAP)

作者： Marcos A. Rodrigues Alan Robinson A. Osman Geometric Modelling and Pattern Recognition Research Group Sheffield Hallam University Sheffield UK

This paper presents a new method for 3D data compression based on parameterization of surface patches. The technique is applied to data that can be defined as single valued functions; this is the case for 3D patches obtained using standard 3D scanners. The method defines a number of mesh cutting planes and the intersection of planes on the mesh defines a set of sampling points. These points contain an explicit structure that allows us to define parametrically both x and y coordinates. The z values are interpolated using high degree polynomials and results show that compressions over 99% are achieved while preserving the quality of the mesh.

关键词： Three dimensional displays Polynomials Surface reconstruction Face Interpolation Data models

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3D modelling and recognition

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WSEAS Transactions on Information Science and Applications 2006年第11期3卷 2118-2122页

作者： Rodrigues, M. Robinson, A. Alboul, L. Brink, W. Geometric Modelling and Pattern Recognition Research Group Materials and Engineering Research Institute Sheffield Hallam University Sheffield United Kingdom

3D face recognition is an open field. This paper presents a method for 3D facial recognition based on Principal Components Analysis. The method uses a relatively large number of facial measurements and ratios and yields reliable recognition. We also highlight an approach to sensor development for fast 3D model acquisition and automatic facial feature extraction.

关键词： Face recognition

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Structured light techniques for 3D surface reconstruction in robotic tasks

Advances in Intelligent Systems and Computing

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Advances in Intelligent Systems and Computing 2013年 226卷 805-814页

作者： Rodrigues, M. Kormann, M. Schuhler, C. Tomek, P. GMPR - Geometric Modelling and Pattern Recognition Group Sheffield Hallam University Sheffield United Kingdom TWI - The Welding Institute Cambridge United Kingdom MFKK - Invention and Research Center Services Budapest Hungary

ISBN: (纸本)9783319009681

Robotic tasks such as navigation and path planning can be greatly enhanced by a vision system capable of providing depth perception from fast and accurate 3D surface reconstruction. Focused on robotic welding tasks we present a comparative analysis of a novel mathematical formulation for 3D surface reconstruction and discuss image processing requirements for reliable detection of patterns in the image. Models are presented for a parallel and angled configurations of light source and image sensor. It is shown that the parallel arrangement requires 35% fewer arithmetic operations to compute a point cloud in 3D being thus more appropriate for real-time applications. Experiments show that the technique is appropriate to scan a variety of surfaces and, in particular, the intended metallic parts for robotic welding tasks. © Springer International Publishing Switzerland 2013.

关键词： Light sources

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An intelligent real time 3D vision system for robotic welding tasks

An intelligent real time 3D vision system for robotic weldin...

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International Symposium on Mechatronics and Its Applications, ISMA

作者： M. Rodrigues M. Kormann C. Schuhler P. Tomek GMPR – Geometric Modelling and Pattern Recognition Group Sheffield Hallam University UK TWI – The Welding Institute Cambridge UK MFKK – Invention and Research Center Services Budapest Hungary

ISBN: (纸本)9781467350143

关键词： Three-dimensional displays Cameras Welding Solid modeling Design automation Image resolution Robots

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