Three registration strategies for point clouds in optical inspection of free form shaped plastic parts

Hanwei Xiong; Ming Pan; Xiangwei Zhang

doi:10.1117/12.870568

11 November 2010 Three registration strategies for point clouds in optical inspection of free form shaped plastic parts

Hanwei Xiong, Ming Pan, Xiangwei Zhang

Proceedings Volume 7855, Optical Metrology and Inspection for Industrial Applications; 785522 (2010) https://doi.org/10.1117/12.870568
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

Plastic is used widely for its cheapness and light weight. In the manufacture of plastic products, optical measurement is always adopted for inspection purpose. There are three phases for a plastic part to be made. First, the rude injection mold must be refined to generate qualified products; then, the technical parameters of the injection machine must be adjusted to produce conforming products efficiently; in the end, the finished products are given. For each phase, optical devices are adopted to obtain point clouds of plastic samples, which are compared with the CAD model, so a registration operation is needed to align the point clouds with the CAD model. In this paper, three different evaluation metrics for registration are put forward for each manufacture phase to meet its special demands. In mold modification phase, a most overlap metric is used to find out the most distortion regions of the mold. In technical parameters adjustment phase, a combined weighted overlap metrics are used to evaluate how close the plastic samples to the CAD model. In the production phase, the samples are placed over a fixture, and a simple feature based registration is used. For each evaluation metric, a suitable algorithm is developed to realize the registration operation. A car's interior panel is used to verify the idea, and the test results proof the validity of the method.

Citation Download Citation

Hanwei Xiong, Ming Pan, and Xiangwei Zhang "Three registration strategies for point clouds in optical inspection of free form shaped plastic parts", Proc. SPIE 7855, Optical Metrology and Inspection for Industrial Applications, 785522 (11 November 2010); https://doi.org/10.1117/12.870568

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KEYWORDS

Clouds

Computer aided design

Inspection

Solid modeling

Image registration

Manufacturing

Statistical modeling

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