@conference{Roberti2018b,
title = {An energy saving approach to active object recognition and localization},
author = {Andrea Roberti and Riccardo Muradore and Paolo Fiorini and Marco Cristani and Francesco Setti},
editor = {IECON 2018},
doi = {10.1109/IECON.2018.8591411},
year = {2018},
date = {2018-10-21},
organization = {Annual Conference of the IEEE Industrial Electronics Society (IECON).Washington, DC, USA. },
abstract = {We propose an active object recognition (AOR) strategy explicitly suited to work with a real robotic arm. So far, AOR policies on robotic arms have focused on heterogeneous constraints, most of them related to classification accuracy, classification confidence, number of moves etc., discarding physical and energetic constraints a real robot has to fulfill. Our strategy adjusts this discrepancy, with a POMDP-based AOR algorithm that explicitly considers manipulability and energetic terms in the planning optimization. The manipulability term avoids the robotic arm to encounter singularities, which require expensive and straining backtracking steps; the energetic term deals with the arm gravity compensation when in static conditions, which is crucial in AOR policies where time is spent in the classifier belief update, before to do the next move. Several experiments have been carried out on a redundant, 7-DoF Panda arm manipulator, on a multi-object recognition task. This allows to appreciate the improvement of our solution with respect to other competitors evaluated on simulations only.},
keywords = {Active object recognition, Artificial Intelligence, Computer Science, Learning, Object recognition, Pattern Recognition, POMDP, Robotics},
pubstate = {published},
tppubtype = {conference}
}

@conference{González2018,
title = {Estimation of interaction forces in robotic surgery using a semi-supervised deep neural network model},
author = {Marbán Arturo and Vignesh Srinivasan and Wojciech Samek and Josep Fernández and Alicia Casals},
editor = {IEEE},
url = {https://upcommons.upc.edu/bitstream/handle/2117/132610/iros2018_paper_26_07_2018.pdf?sequence=3&isAllowed=y},
doi = {10.1109/IROS.2018.8593701},
year = {2018},
date = {2018-08-09},
abstract = {Providing force feedback as a feature in current Robot-Assisted Minimally Invasive Surgery systems still remains a challenge. In recent years, Vision-Based Force Sensing (VBFS) has emerged as a promising approach to address this problem. Existing methods have been developed in a Supervised Learning (SL) setting. Nonetheless, most of the video sequences related to robotic surgery are not provided with ground-truth force data, which can be easily acquired in a controlled environment. A powerful approach to process unlabeled video sequences and find a compact representation for each video frame relies on using an Unsupervised Learning (UL) method. Afterward, a model trained in an SL setting can take advantage of the available ground-truth force data. In the present work, UL and SL techniques are used to investigate a model in a Semi-Supervised Learning (SSL) framework, consisting of an encoder network and a Long-Short Term Memory (LSTM) network. First, a Convolutional Auto-Encoder (CAE) is trained to learn a compact representation for each RGB frame in a video sequence. To facilitate the reconstruction of high and low frequencies found in images, this CAE is optimized using an adversarial framework and a L1-loss, respectively. Thereafter, the encoder network of the CAE is serially connected with an LSTM network and trained jointly to minimize the difference between ground-truth and estimated force data. Datasets addressing the force estimation task are scarce. Therefore, the experiments have been validated in a custom dataset. The results suggest that the proposed approach is promising.},
keywords = {Learning, Robot, Robotic surgery, Robotics, Surgery, Training},
pubstate = {published},
tppubtype = {conference}
}