The virtual binocular vision sensing system was designed based on single camera through the refraction principle of biprism, the accuracy of which reached to sub-pixel. The intrinsic and external parameters of both virtual cameras and relative position were calculated, and the image pairs were rectified. Then, adaptive Census transform (ACT) stereo matching algorithm was optimized for calculating the parallax of the rectified image pairs with sub-pixel accuracy. The three-dimensional appearance of a standardized cylinder was reconstructed through the triangulation method. The results showed that the width error was less than 3.17% and the height error had a maximum of 5.83%. The image pairs of molten pool in GMA additive manufacturing were taken as an example, while the parallax with sub-pixel accuracy of the image pairs was calculated based on the optimized adaptive Census transform stereo matching algorithm. Finally, the three-dimensional appearance of molten pool was obtained via the triangulation approach.
YIN Ziqiu
,
XIONG Jun
. Three-dimensional reconstruction of molten pool appearance in GMA additive manufacturing based on ACT stereo matching algorithm[J]. Transactions of The China Welding Institution, 2019
, 40(1)
: 49
-52
.
DOI: TG442;TG115.28
[1] Williams S W, Martina F, Addison A C, et al. Wire+arc additive manufacturing[J]. Materials Science and Technology, 2016, 32(7):641-647.
[2] Ding D H, Pan Z X, Cuiuri D, et al. Wire-feed additive manufacturing of metal components:technologies, developments and future interests[J]. The International Journal of Advanced Manufacturing Technology, 2015, 81(1-4):465-481.
[3] 柏久阳, 王计辉, 林三宝, 等. 铝合金电弧增材制造焊道宽度尺寸预测[J]. 焊接学报, 2015, 36(9):87-90 Bai Jiuyang, Wang Jihui, Lin Sanbao, et al. Width prediction of aluminium alloy weld additively manufactured by TIG arc[J]. Transactions of the China Welding Institution, 2015, 36(9):87-90
[4] Nilsiam Y, Haselhuhn A, Wijnen B, et al. Integrated voltage-current monitoring and control of gas metal arc weld magnetic ball-jointed open source 3-D printer[J]. Machines, 2015, 3(4):339-351.
[5] Spencer J D, Dickens P M, Wykes C M. Rapid prototyping of metal parts by three-dimensional welding[J]. Proceedings of the Institution of Mechanical Engineers, Part B:Journal of Engineering Manufacture, 1998, 212(3):175-182.
[6] Wang H J, Jiang W H, Ouyang J H, et al. Rapid prototyping of 4043 Al-alloy parts by VP-GTAW[J]. Journal of Materials Processing Technology, 2004, 148(1):93-102.
[7] Xiong J, Zhang G J, Qiu Z L, et al. Vision-sensing and bead width control of a single-bead multi-layer part:material and energy savings in GMAW-based rapid manufacturing[J]. Journal of Cleaner Production, 2013, 41(1):82-88.
[8] 熊俊. 多层单道GMA增材制造成形特性及熔敷尺寸控制[D]. 哈尔滨:哈尔滨工业大学, 2014.
[9] Zhang Z Y. A flexible new technique for camera calibration[J]. IEEE Transactions on Pattern Analysis and Machine Intelligence, 2000, 22(11):1330-1334.
[10] Fusiello A, Trucco E, Verri A. A compact algorithm for rectification of stereo pairs[J]. Machine Vision and Applications, 2000, 12(1):16-22.
