Training Computer Vision (CV) models for patient monitoring in clinical settings, such as rehabilitation beds, is often hindered by the impracticality of collecting real-world image data for at-risk scenarios. This study proposes and validates a methodology based on generating a synthetic dataset using 3D modeling. A virtual environment replicating a Reconfigurable Assistive Technology Platform (RATP) was created in Blender software, and animated human models were used to generate 960 images depicting 'safe' (sleeping) and 'at-risk' (fallen) states. A series of eight experiments was carried out to systematically evaluate eight distinct model architectures (MAs), comparing two development frameworks (TensorFlow/Keras and PyTorch), two training strategies (Transfer Learning with MobileNetV2 and training from scratch), and the effect of an image preprocessing pipeline. The results revealed a significant performance disparity between frameworks when evaluated on a benchmark dataset. The best-performing model, a PyTorch-based Transfer Learning architecture (MA3), achieved 95.8% precision in detecting at-risk states, substantially outperforming its TensorFlow counterpart (MA1) at 58.7%. Furthermore, the effect of preprocessing proved to be highly context-dependent, improving performance in one framework while severely degrading it in the other. This work demonstrates the viability of using synthetic data for this application but concludes that model performance is critically sensitive not only to the learning strategy but also to the underlying software framework and preprocessing choices, highlighting the need for careful experimental environment configuration.
Cardoso, R.; Parola, V.; Neves, H.; Bernardes, R.A.; Duque, F.M.; Mendes, C.A.; et al. Physical Rehabilitation Programs for Bedridden Patients with Prolonged Immobility: A Scoping Review. Int. J. Environ. Res. Public Health 2022, 19, 6420.
World Health Organization. Rehabilitation. Available online: https://www.who.int/health-topics/rehabilitation (accessed on 9 February 2025).
Paul, S.; Riffat, M.; Yasir, A.; Mahim, M. N.; Sharnali, B. Y.; Naheen, I. T.; et al. Industry 4.0 applications for medical/healthcare services. J. Sens. Actuator Netw. 2021, 10, 43.
Santos, B.; Martins, D.; Leao, T.; Bock, E. Supervisory Control System for Hospital Rehabilitation Beds. In Proceedings of the 2021 9th International Conference on Control, Mechatronics and Automation (ICCMA), Belval, Luxembourg, 11-14 November 2021; pp. 130–134.
Lu, Y.; Zhang, Y.; Tian, Y. Research Progress of Intelligent Management Model Application in Hospital-at-Home Care. J. Phys.: Conf. Ser. 2023, 2425(1), 012041.
Barreto, R.L.P.; Simoni, R.; Martins, D. An initial assessment of mechanisms for the development of new hospital beds. In Multibody Mechatronic Systems: Proceedings of the MUSME Conference held in Florianópolis, Brazil, October 24–28, 2017; Springer International Publishing: Cham, Switzerland, 2018; Vol. 6, pp. 485–494.
Campos, A.; Cortés, E.; Martins, D.; Ferre, M.; Contreras, A. Development of a flexible rehabilitation system for bedridden patients. J. Braz. Soc. Mech. Sci. Eng. 2021, 43, 361.
Santos, B.J.; Leão, T.F.; Palma, R.; Martins, D.; Bock, E.G.P. A Supervisory Control System for Flexible Hospital Rehabilitation Beds Based on Computer Vision. In Proceedings of the 2023 International Conference on Robotics, Control and Vision Engineering, Tokyo, Japan, 21-23 July 2023; pp. 48–53.
Szeliski, R. Computer Vision: Algorithms and Applications; Springer Nature, 2022.
Khan, A.A.; Laghari, A.A.; Awan, S.A. Machine Learning in Computer Vision: A Review. EAI Endorsed Trans. Scalable Inf. Syst. 2021, 8, e4.
Man, K.; Chahl, J. A Review of Synthetic Image Data and Its Use in Computer Vision. J. Imaging 2022, 8, 310.
Leilabadi, S.H.; Schmidt, S. In-Depth Analysis of Autonomous Vehicle Collisions in California. In Proceedings of the 2019 IEEE Intelligent Transportation Systems Conference (ITSC), Auckland, New Zealand, 27-30 October 2019; pp. 889–893.
Major, L.; Shah, J. What to Expect When You're Expecting Robots: The Future of Human-Robot Collaboration; Hachette UK, 2020.
Islam, M.N.; Aadeeb, M.S.; Munna, M.M.H.; Rahman, M.R. A Deep Learning Based Multimodal Interaction System for Bed Ridden and Immobile Hospital Admitted Patients: Design, Development and Evaluation. BMC Health Serv. Res. 2022, 22, 803.
Beery, S.; Liu, Y.; Morris, D.; Piavis, J.; Kapoor, A.; Meister, M.; et al. Synthetic Examples Improve Generalization for Rare Classes. In Proceedings of the 2020 IEEE Winter Conference on Applications of Computer Vision (WACV), Snowmass, CO, USA, 1-5 March 2020; pp. 863–873.
Gao, C.; Killeen, B.D.; Hu, Y.; Grupp, R.B.; Taylor, R.H.; Armand, M.; Unberath, M. Synthetic data accelerates the development of generalizable learning-based algorithms for X-ray image analysis. Nat. Mach. Intell. 2023, 5, 294–308.
Zou, Z.; Chen, K.; Shi, Z.; Guo, Y.; Ye, J. Object Detection in 20 Years: A Survey. Proc. IEEE 2023, 111, 257–276.
Blender. Blender Documentation. Available online: https://docs.blender.org/manual/en/latest/ (accessed on 4 July 2025).
Mahler, J.; Liang, J.; Niyaz, S.; Laskey, M.; Doan, R.; Liu, X.; et al. Dex-net 2.0: Deep learning to plan robust grasps with synthetic point clouds and analytic grasp metrics. arXiv 2017, arXiv:1703.09312.
Tai, L.; Paolo, G.; Liu, M. Virtual-to-real deep reinforcement learning: Continuous control of mobile robots for mapless navigation. In Proceedings of the 2017 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), Vancouver, BC, Canada, 24-28 September 2017; pp. 31–36.
Tobin, J.; Fong, R.; Ray, A.; Schneider, J.; Zaremba, W.; Abbeel, P. Domain randomization for transferring deep neural networks from simulation to the real world. In Proceedings of the 2017 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), Vancouver, BC, Canada, 24-28 September 2017; pp. 23–30.
Sadeghi, F.; Levine, S. Cad2rl: Real single-image flight without a single real image. arXiv 2016, arXiv:1611.04201.
Akkaya, I.; Andrychowicz, M.; Chociej, M.; Litwin, M.; McGrew, B.; Petron, A.; et al. Solving Rubik's cube with a robot hand. arXiv 2019, arXiv:1910.07113.
Ros, G.; Sellart, L.; Materzynska, J.; Vazquez, D.; Lopez, A.M. The SYNTHIA dataset: A large collection of synthetic images for semantic segmentation of urban scenes. In Proceedings of the 2016 IEEE Conference on Computer Vision and Pattern Recognition (CVPR), Las Vegas, NV, USA, 27-30 June 2016; pp. 3234–3243.
Dosovitskiy, A.; Ros, G.; Codevilla, F.; Lopez, A.; Koltun, V. CARLA: An open urban driving simulator. In Proceedings of the 1st Annual Conference on Robot Learning, Mountain View, CA, USA, 13-15 November 2017; pp. 1–16.
Bousmalis, K.; Irpan, A.; Wohlhart, P.; Bai, Y.; Kelcey, M.; Kalakrishnan, M.; et al. Using simulation and domain adaptation to improve efficiency of deep robotic grasping. In Proceedings of the 2018 IEEE International Conference on Robotics and Automation (ICRA), Brisbane, QLD, Australia, 21-25 May 2018; pp. 4243–4250.
Shrivastava, A.; Pfister, T.; Tuzel, O.; Susskind, J.; Wang, W.; Webb, R. Learning from simulated and unsupervised images through adversarial training. In Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition (CVPR), Honolulu, HI, USA, 21-26 July 2017; pp. 2107–2116.
James, S.; Wohlhart, P.; Kalakrishnan, M.; Kalashnikov, D.; Irpan, A.; Ibarz, J.; et al. Sim-to-real via sim-to-sim: Data-efficient robotic grasping via randomized-to-canonical adaptation networks. In Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), Long Beach, CA, USA, 15-20 June 2019; pp. 12627–12637.
OpenCV. OpenCV Documentation 4.0.1. Available online: https://docs.opencv.org/4.x/ (accessed on 4 July 2025).
TensorFlow. TensorFlow Documentation. Available online: https://www.tensorflow.org/api_docs (accessed on 4 July 2025).
Keras. Keras Documentation. Available online: https://keras.io/guides/ (accessed on 4 July 2025).
PyTorch. PyTorch Documentation. Available online: https://pytorch.org/docs/stable/index.html (accessed on 4 July 2025).
Sandler, M.; Howard, A.; Zhu, M.; Zhmoginov, A.; Chen, L.C. Mobilenetv2: Inverted residuals and linear bottlenecks. In Proceedings of the 2018 IEEE Conference on Computer Vision and Pattern Recognition, Salt Lake City, UT, USA, 18-23 June 2018; pp. 4510–4520.
Carraro, M.; Antonello, M.; Tonin, L.; Menegatti, E. An open source robotic platform for ambient assisted living. In AIRO@AIIA; 2015; pp. 3–18.
Maldonado-Bascon, S.; Iglesias-Iglesias, C.; Martín-Martín, P.; Lafuente-Arroyo, S. Fallen people detection capabilities using assistive robot. Electronics 2019, 8, 915.
Ferrão, I.G.; de Oliveira, A.; Marçal, V.; Allão, D.; Espes, D.; Dezan, C.; et al. Supervised models for detecting GPS attacks and faults in UAVs: a comparative analysis. In Proceedings of the 2024 Latin American Robotics Symposium (LARS), November 2024; pp. 1–6.