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A 3D cephalometric protocol for the accurate quantification of the craniofacial symmetry and facial growth (2019)
Journal Article
Pinheiro, M., Ma, X., Fagan, M. J., McIntyre, G. T., Lin, P., Sivamurthy, G., & Mossey, P. A. (2019). A 3D cephalometric protocol for the accurate quantification of the craniofacial symmetry and facial growth. Journal of Biological Engineering, 13(1), https://doi.org/10.1186/s13036-019-0171-6

© 2019 The Author(s). Background: Cephalometric analysis is used to evaluate facial growth, to study the anatomical relationships within the face. Cephalometric assessment is based on 2D radiographic images, either the sagittal or coronal planes and... Read More

Towards additive manufacturing oriented geometric modeling using implicit functions (2018)
Journal Article
Li, Q., Hong, Q., Qi, Q., Ma, X., Han, X., & Tian, J. (2018). Towards additive manufacturing oriented geometric modeling using implicit functions. Visual Computing for Industry, Biomedicine, and Art, 1(1), https://doi.org/10.1186/s42492-018-0009-y

Surface-based geometric modeling has many advantages in terms of visualization and traditional subtractive manufacturing using computer-numerical-control cutting-machine tools. However, it is not an ideal solution for additive manufacturing because t... Read More

Surface fitting for quasi scattered data from coordinate measuring systems (2018)
Journal Article
Mao, Q., Liu, S., Wang, S., & Ma, X. (2018). Surface fitting for quasi scattered data from coordinate measuring systems. Sensors, 18(1), 214. https://doi.org/10.3390/s18010214

Non-uniform rational B-spline (NURBS) surface fitting from data points is wildly used in the fields of computer aided design (CAD), medical imaging, cultural relic representation and object-shape detection. Usually, the measured data acquired from co... Read More

T-spline based unifying registration procedure for free-form surface workpieces in intelligent CMM (2017)
Journal Article
Han, Z., Wang, Y., Ma, X., Liu, S., Zhang, X., & Zhang, G. (2017). T-spline based unifying registration procedure for free-form surface workpieces in intelligent CMM. Applied Sciences, 7(10), 1092. https://doi.org/10.3390/app7101092

With the development of the modern manufacturing industry, the free-form surface is widely used in various fields, and the automatic detection of a free-form surface is an important function of future intelligent three-coordinate measuring machines (... Read More

Digital three-dimensional automation of the modified Huddart and Bodenham scoring system for patients with cleft lip and palate (2017)
Journal Article
Ma, X., Martin, C., McIntyre, G., Lin, P., & Mossey, P. (2017). Digital three-dimensional automation of the modified Huddart and Bodenham scoring system for patients with cleft lip and palate. Cleft Palate-Craniofacial Journal, 54(4), (481-486). doi:10.1597/15-340. ISSN 1055-6656

© Copyright 2017 American Cleft Palate-Craniofacial Association. Objective: The modified Huddart and Bodenham scoring system assesses maxillary arch constriction and surgical outcomes in cleft lip and palate. This project automates modified Huddart a... Read More

The validity and reliability of an automated method of scoring dental arch relationships in unilateral cleft lip and palate using the modified Huddart-Bodenham scoring system (2016)
Journal Article
Martin, C. B., Ma, X., McIntyre, G. T., Wang, W., Lin, P., Chalmers, E. V., & Mossey, P. A. (2016). The validity and reliability of an automated method of scoring dental arch relationships in unilateral cleft lip and palate using the modified Huddart-Bodenham scoring system. European Journal of Orthodontics, 38(4), 353-358. https://doi.org/10.1093/ejo/cjw031

Objective: To evaluate an automated software tool for the assessment of dental arch relationships using the modified Huddart and Bodenham index. Design: Cohort of 43 models of subjects aged 9-21 with UCLP and the ten GOSLON reference models sets. Met... Read More

Subdivision surface fitting to a dense mesh using ridges and umbilics (2014)
Journal Article
Kosinka, J., Ma, X., Jiang, Y., Keates, S., & Kosinka, J. (2015). Subdivision surface fitting to a dense mesh using ridges and umbilics. Computer aided geometric design, 32(January), 5-21. https://doi.org/10.1016/j.cagd.2014.10.001

Fitting a sparse surface to approximate vast dense data is of interest for many applications: reverse engineering, recognition and compression, etc. The present work provides an approach to fit a Loop subdivision surface to a dense triangular mesh of... Read More

Non-uniform order mixed FEM approximation: Implementation, post-processing, computable error bound and adaptivity (2011)
Journal Article
Ainsworth, M., & Ma, X. (2012). Non-uniform order mixed FEM approximation: Implementation, post-processing, computable error bound and adaptivity. Journal of Computational Physics, 231(2), 436-453. https://doi.org/10.1016/j.jcp.2011.09.011

The present work provides a straightforward and focused set of tools and corresponding theoretical support for the implementation of an adaptive high order finite element code with guaranteed error control for the approximation of elliptic problems i... Read More

Shape preserving data reduction for 3D surface points (2011)
Journal Article
Ma, X., & Cripps, R. J. (2011). Shape preserving data reduction for 3D surface points. Computer aided design, 43(8), 902-909. https://doi.org/10.1016/j.cad.2011.03.006

In reverse engineering, vast amounts of point data captured by certain types of scanners significantly increase the complexity and reduce the efficiency in downstream activities, such as surface modelling and manufacturing. Data reduction has therefo... Read More

Estimation of end curvatures from planar point data (2007)
Book Chapter
Ma, X., & Cripps, R. J. (2007). Estimation of end curvatures from planar point data. In R. Martin, M. Sabin, & J. Winkler (Eds.), Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-540-73843-5_19

Given a string of discrete planar points, the estimation of principal curvature vectors using circle fitting and Richardson’s extrapolation principle has been considered by several authors. However, these methods can not be directly applied to end po... Read More

The Visualization System of CAD Drawing Workpiece (2003)
Journal Article
Nayonglin, , Ma, X., Liu, S., & Zhang, G. (2003). The Visualization System of CAD Drawing Workpiece. Computer Simulation, 20(10), 102-104. https://doi.org/10.3969...n.1006-9348.2003.10.034

This paper presents a visualization system that can complete the visualization process of CAD drawing workpieces. It introduces the four main functional modules of the visualization system: IGES file extraction and recognition, 3D reconstruction, gra... Read More

Measuring information integration model for CAD/CMM (2003)
Journal Article
Ma, X. (2003). Measuring information integration model for CAD/CMM. Chinese Journal of Mechanical Engineering, 16(1), 59-61. https://doi.org/10.3901/CJME.2003.01.059

A CAD/CMM workpiece modeling system based on IGES file is proposed. The modeling system is implemented by using a method of labelling the tolerance items of 3D workpiece. The concept-feature face is used in the method. Firstly the CAD data of workpie... Read More

Automatic Recognition for the Position and Orientation of Parts in Intelligent CMMs (2003)
Journal Article
Ma, X. (2003). Automatic Recognition for the Position and Orientation of Parts in Intelligent CMMs. Yi qi yi biao xue bao = Chinese journal of scientific instrument, 24(2), 165-170. https://doi.org/10.3321...3A0254-3087.2003.02.015

A method for automatic recognition of the position and orientation of parts based on machine vision and CAD 3D model is proposed Virtual image matching is used to confirm the position and orientation of the part By perspective imagery,virtual images... Read More

Towards the Intelligent CMM (2002)
Journal Article
Zhang, G., Liu, S., Ma, X., Wang, J., Wu, Y., & Li, Z. (2002). Towards the Intelligent CMM. CIRP Annals - Manufacturing Technology, 51(1), 437-442. https://doi.org/10.1016/s0007-8506%2807%2961555-8

‘Intelligent’ CMMs are likely to become the next generation of CMMs. In this paper the main features of an intelligent CMM are proposed. In operation, the geometric and measuring information of the part would be extracted from its CAD file. A measuri... Read More

Implementation of IGES-based CAD/CMM Automatic Workpiece Modelling (2000)
Journal Article
Zuo, Z., Ma, X., & Liu, S. (2000). Implementation of IGES-based CAD/CMM Automatic Workpiece Modelling. Aviation Precision Manufacturing Technology, 36(3), 28-33. https://doi.org/10.3969...n.1003-5451.2000.03.007

In this paper,a CAD/CMM workpiece modelling system,which is based on IGES-files,is proposed.In this system,the CAD data of workpiece to be measured are extracted and recognized automatically,and the workpiece model is generated as a result of process... Read More

Displacement encoder using sine micro-window grating (1999)
Journal Article
Wang, C., Ma, X., Zhang, G., & Guo, S. (1999). Displacement encoder using sine micro-window grating. Acta Optica Sinica, 19(9), 1153-1157

A novel displacement encoder, employing a sine micro-window grating and featuring high quality signals free from harmonic errors, was developed. The sine micro-window grating is a special component composed of arrays of micro-elements with a sine win... Read More

A subdivision-based implementation of non-uniform local refinement with THB-splines
Conference Proceeding
Li, Q., Ma, X., Cripps, R., & Lin, P. A subdivision-based implementation of non-uniform local refinement with THB-splines

Paper accepted for 15th IMA International Conference on Mathematics on Surfaces, 2017. Abstract: Local refinement of spline basis functions is an important process for spline approximation and local feature modelling in computer aided design (CAD). T... Read More