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Novel image restoration model coupling gradient fidelity term based on adaptive total variation

Journal of Beijing Institute of Technology 2011年第2期20卷 261-266页

作者：石明珠许廷发梁炯冯亮张坤周立伟 School of Optoelectronics Beijing Institute of Technology Key Laboratory of Photo Electronic Imaging Technology and System Ministry of Education of China Beijing Institute of Technology

A novel image restoration model coupling with a gradient fidelity term based on adaptive total variation is proposed in this paper. In order to choose proper parameters, the selection criteria were analyzed theoretically, and a simple scheme to demonstrate its validity was adopted experimentally. To make fair comparisons of performances of three models, the same numerical algorithm was used to solve partial differential equations. Both the international standard test image on Lena and HR image of CBERS-02B of Dalian city were used to verify the performance of the model. Experimental results illustrate that the new model not only preserved the edge and important details but also alleviated the staircase effect effectively.

关键词： image restoration total variation(TV) gradient fidelity term staircase effect

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effect of Acetone Vapor Smoothing Process on Surface Finish and Geometric Accuracy of Fused Deposition Modeling ABS Parts

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Journal of Materials Science and Chemical Engineering 2022年第10期10卷 1-9页

作者： Viviane Pestano Mariana Pohlmann Fabio Pinto da Silva Design and Materials Selection Lab Postgraduate Program in Design Federal University of Rio Grande do Sul Porto Alegre Brazil

FDM is a widely used additive manufacturing process, however, it has some limitations, such as surface finish, due to the staircase effect caused by the layer-by-layer deposition. Studies have been conducted on surface finish of ABS parts with the use of acetone, but the process parameters and the resulting effects have not been fully investigated in the literature. Therefore, the aim of this study was to investigate the effects of acetone vapor smoothing process on surface finish and geometric accuracy of fused deposition modeling ABS parts. Specimens with different geometries were created and printed using two directions in different scales. The parts were exposed to acetone vapor for 20, 30 and 40 minutes. 3D deviation maps, roughness and microscopic analyses were conducted. The staircase effect was reduced at the expense of some geometric deviations, which varied according to the exposure time and part orientation. The smoothing process applied to the flat surfaces proved to be quite effective in reducing roughness by 90%, however, this reduction led to an undesirable rounding of the sharp edges. The results obtained in this study are consistent with those found in the literature and may help improve the quality of the ABS printed parts.

关键词： Additive Manufacturing 3D Printing FDM staircase effect Acetone Vapor Polishing

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