Hong-Tzong Yau

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In this paper, a real-time dynamics-based look-ahead (DBLA) algorithm for NURBS interpolator is proposed to generate a jerk-limited acceleration/deceleration (ACC/DEC) feedrate profile. The interpolator consists of three modules. The geometric module detects the local maximum/ minimum (max/min) curvatures, and divides a NURBS curve into small segments. The(More)
Methodologies for planning motion trajectory of parametric interpolation such as non-uniform rational B-spline (NURBS) curves have been proposed in the past. However, most of the algorithms were developed based on the constraints of feedrate, acceleration/deceleration (acc/dec), jerk, and chord errors. The errors caused by servo dynamics were rarely(More)
This paper presents a Delaunay-based region-growing (DBRG) surface reconstruction algorithm that holds the advantages of both Delaunay-based and region-growing approaches. The proposed DBRG algorithm takes a set of unorganized sample points from the boundary surface of a threedimensional object and produces an orientable manifold triangulated model with a(More)
Modern motion control adopts NURBS (Non-Uniform Rational B-Spline) interpolation for the purpose of achieving high-speed and highaccuracy performance. However, in conventional control architectures, the computation of the basis functions of a NURBS curve is very timeconsuming due to serial computing constraints. In this paper, a novel FPGA (Field(More)
In the framework of Virtual CMM [1], virtual parts are proposed to be constructed as triangulated surface models. This paper presents a novel surface reconstruction method to the creation of virtual parts. It is based on the idea of identification and sculpting of concave regions of a Delaunay triangulation of the sample data. The proposed algorithm is(More)
This paper proposes a full tooth reconstruction method by integrating 3D scanner data and computed tomography (CT) image sets. In traditional dental treatment, plaster models are used to record patient׳s oral information and assist dentists for diagnoses. However, plaster models only save surface information, and are therefore unable to provide further(More)