Abstract
This work presents a novel methodology for the quality assessment of material extrusion parts through AI-based Computer Vision. To this end, different techniques are integrated using inspection methods that are applied to other areas in additive manufacturing field. The system is divided into four main points: (1) pre-processing, (2) color analysis, (3) shape analysis, and (4) defect location. The color analysis is performed in CIELAB color space, and the color distance between the part under analysis and the reference surface is calculated using the color difference formula CIE2000. The shape analysis consists of the binarization of the image using the Canny edge detector. Then, the Hu moments are calculated for images from the part under analysis and the results are compared with those from the reference part. To locate defects, the image of the part to be analyzed is first processed with a median filter, and both the original and filtered image are subtracted. Then, the resulting image is binarized, and the defects are located through a blob detector. In the training phase, a subset of parts was used to evaluate the performance of different methods and to set the values of parameters. Later, in a testing and validation phase, the performance of the system was evaluated using a different set of parts. The results show that the proposed system is able to classify parts produced by additive manufacturing, with an overall accuracy of 86.5%, and to locate defects on their surfaces in a more effective manner.
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13 January 2023
Springer Nature’s version of this paper was updated to present the correct ORCID of the corresponding author.
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Acknowledgements
The author Rui Pedro Castro Nascimento acknowledges the INEGI Institute of Science and Innovation in Mechanical and Industrial Engineering.
Funding
This work was developed under the R&DT Project – InSoleTech POCI01-0247-FEDER-038470, co-financed by the Competitiveness and Internationalization Operational Program (POCI), through Portugal 2020 and the European Regional Development Fund (FEDER).
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Rui Pedro Castro Nascimento: Conceptualization, Methodology, Software, Writing Original Draft, Investigation, Formal analysis. Maria Isabel Martins: Conceptualization, Methodology, Validation, Supervision, Project administration, Writing Review and Editing. Thiago Assis Dutra: Validation, Writing Original Draft. Luís Carlos Moreira: Supervision, Funding acquisition.
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Nascimento, R., Martins, I., Dutra, T.A. et al. Computer Vision Based Quality Control for Additive Manufacturing Parts. Int J Adv Manuf Technol 124, 3241–3256 (2023). https://doi.org/10.1007/s00170-022-10683-5
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DOI: https://doi.org/10.1007/s00170-022-10683-5