Pre-Processing and Surface Reconstruction of Points Cloud Based on Chord Angle Algorithm Technique

Abstract

Abstract
 Although the rapid development in reverse engineering techniques, 3D laser scanners can be considered the modern technology used to digitize the 3D objects, but some troubles may be associate this process due to the environmental noises and limitation of the used scanners. So, in the present paper a data pre-processing algorithm has been proposed to obtain the necessary geometric features and mathematical representation of scanned object from its point cloud which obtained using 3D laser scanner (Matter and Form) through isolating the noised points. The proposed algorithm based on continuous calculations of chord angle between each adjacent pair of points in point cloud. A MATLAB program has been built to perform the proposed algorithm which implemented using a suggested case studies with cylinder and dome shape. The resulted point cloud from application the proposed algorithm and result of surface fitting for the case studies has been proved the proficiency of the proposed chord angle algorithm in pre-processing of data points and clean the point cloud, where the percent of data which was ignored as noisy data points according to proposed chord angle algorithm was arrived to (81.52%) and (75.01%)of total number of data points in point cloud for first and second case study respectively.

A New Definition of the Dual Interpolation Curve for CAD Modeling and Geometry Defeaturing

“…Reverse engineering is an attractive technique for computer-aided design (CAD) model construction from the scattered points of an existing solid [1,2]. Curve modeling has emerged as a powerful technology to treat experimental data points, which is concerned with fitting the given point set to a suitable mathematical model [3][4][5].…”

“…The dual interpolation curve has many interesting properties, making it an efficient and powerful technique for shape modeling. The contributions and innovations of the dual interpolation curve can be summarized in the following aspects: (1) Combined with fictitious and intrinsic nodes, the dual interpolation curve is flexible and reliable for curve modeling fairly. (2) An a ractive scheme of the dual interpolation curve is proposed to characterize lower-order or higher-order curves along the non-smooth boundary.…”