chore: import upstream snapshot with attribution

modules/objdetect/doc/objdetect.bib

@@ -0,0 +1,50 @@
+@article{Aruco2014,
+  author = {S. Garrido-Jurado and R. Mu\~noz-Salinas and F.J. Madrid-Cuevas and M.J. Mar\'in-Jim\'enez}
+  title = {Automatic generation and detection of highly reliable fiducial markers under occlusion},
+  year = {2014},
+  pages = {2280 - 2292},
+  journal = {Pattern Recognition},
+  volume = {47},
+  number = {6},
+  issn = {0031-3203},
+  doi = {http://dx.doi.org/10.1016/j.patcog.2014.01.005},
+  url = {http://www.sciencedirect.com/science/article/pii/S0031320314000235}
+}
+
+@inproceedings{wang2016iros,
+  author = {John Wang and Edwin Olson},
+  title = {{AprilTag} 2: Efficient and robust fiducial detection},
+  booktitle = {Proceedings of the {IEEE/RSJ} International Conference on Intelligent Robots and Systems {(IROS)}},
+  year = {2016},
+  month = {October},
+  url = {https://april.eecs.umich.edu/pdfs/wang2016iros.pdf}
+}
+
+@mastersthesis{Xiangmin2015research,
+  title={Research on Barcode Recognition Technology In a Complex Background},
+  author={Xiangmin, Wang},
+  year={2015},
+  school={Huazhong University of Science and Technology}
+}
+
+@article{bazen2002systematic,
+  title={Systematic methods for the computation of the directional fields and singular points of fingerprints},
+  author={Bazen, Asker M and Gerez, Sabih H},
+  journal={IEEE transactions on pattern analysis and machine intelligence},
+  volume={24},
+  number={7},
+  pages={905--919},
+  year={2002},
+  publisher={IEEE}
+}
+
+@article{kass1987analyzing,
+  title={Analyzing oriented patterns},
+  author={Kass, Michael and Witkin, Andrew},
+  journal={Computer vision, graphics, and image processing},
+  volume={37},
+  number={3},
+  pages={362--385},
+  year={1987},
+  publisher={Elsevier}
+}