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When did The Matrix 4 start filming?

Matrix (mathematics)

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Open access•Journal Article•DOI Fermions and noncommutative emergent gravity II: Curved branes in extra dimensions Daniela Klammer, Harold Steinacker - Show less +1 more 29 Sep 2009-arXiv: High Energy Physics - Theory 3 Citations	This generalizes previous results for 4-dimensional matrix models.
Journal Article•DOI On Complex Split Quaternion Matrices Melek Erdoğdu, Mustafa Özdemir - Show less +1 more 02 Jun 2013-Advances in Applied Clifford Algebras 28 Citations	We also prove that any complex split quaternion has a 4 × 4 complex matrix representation.
Proceedings Article•DOI Through-the-Lens Drone Filming Chong Huang, Zhenyu Yang, Yan Kong, Peng Chen, Xin Yang, Kwang-Ting Tim Cheng - Show less +5 more 01 Oct 2018 27 Citations	In this paper, we introduce a novel drone filming system which integrates monocular 3D human pose estimation and localization into a drone platform to remove the constraints imposed by wearable-sensor-based solutions.
Journal Article•DOI Refilming with Depth-Inferred Videos Guofeng Zhang, Zilong Dong, Jiaya Jia, Liang Wan, Tien-Tsin Wong, Hujun Bao - Show less +5 more 01 Sep 2009-IEEE Transactions on Visualization and Computer Graphics 40 Citations	Unlike the typical filming practice, our system requires no labor-intensive construction of 3D models/surfaces mimicking the real scene.
Journal Article•DOI Comparison of extended Jones matrices for twisted nematic liquid-crystal displays at oblique angles of incidence Feihong Yu, Hoi Sing Kwok - Show less +1 more 01 Nov 1999-Journal of The Optical Society of America A-optics Image Science and Vision 36 Citations	We show that Yeh’s version is a more accurate approximation to the full 4×4 matrix.
Journal Article•DOI IL-4-induced cell proliferation and production of extracellular matrix proteins in human conjunctival fibroblasts. Youichiro Fujitsu, Ken Fukuda, Naoki Kumagai, Teruo Nishida - Show less +3 more 01 Jan 2003-Experimental Eye Research 51 Citations	These results demonstrate that human conjunctival fibroblasts express receptors for IL-4, and that IL-4 stimulates both the proliferation of and the production of extracellular matrix proteins by these cells.
Open access•Journal Article•DOI Sinogram Blurring Matrix Estimation From Point Sources Measurements With Rank-One Approximation for Fully 3-D PET Kuang Gong, Jian Zhou, Michel S. Tohme, Martin S. Judenhofer, Yang Yongfeng, Jinyi Qi - Show less +5 more 02 Jun 2017-IEEE Transactions on Medical Imaging 18 Citations	The results show that the newly estimated 4-D blurring matrix can improve the image quality over those obtained with a 2-D blurring matrix and requires less point source scans to achieve similar image quality compared with an unconstrained 4-D blurring matrix estimation.

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