International Institute of Information Technology, Hyderabad

About: International Institute of Information Technology, Hyderabad is a education organization based out in Hyderabad, India. It is known for research contribution in the topics: Computer science & Authentication. The organization has 2048 authors who have published 3677 publications receiving 45319 citations. The organization is also known as: IIIT Hyderabad & International Institute of Information Technology (IIIT).

Unsupervised Learning of Deep Feature Representation for Clustering Egocentric Actions

Abstract: Popularity of wearable cameras in life logging, law enforcement, assistive vision and other similar applications is leading to explosion in generation of egocentric video content. First person action recognition is an important aspect of automatic analysis of such videos. Annotating such videos is hard, not only because of obvious scalability constraints, but also because of privacy issues often associated with egocentric videos. This motivates the use of unsupervised methods for egocentric video analysis. In this work, we propose a robust and generic unsupervised approach for first person action clustering. Unlike the contemporary approaches, our technique is neither limited to any particular class of action nor requires priors such as pre-training, fine-tuning, etc. We learn time sequenced visual and flow features from an array of weak feature extractors based on convolutional and LSTM autoencoder networks. We demonstrate that clustering of such features leads to the discovery of semantically meaningful actions present in the video. We validate our approach on four disparate public egocentric actions datasets amounting to approximately 50 hours of videos. We show that our approach surpasses the supervised state of the art accuracies without using the action labels.

A novel and efficient user access control scheme for wireless body area sensor networks

Abstract: Wireless body area networks (WBANs) can be applied to provide healthcare and patient monitoring. However, patient privacy can be vulnerable in a WBAN unless security is considered. Access to authorized users for the correct information and resources for different services can be provided with the help of efficient user access control mechanisms. This paper proposes a new user access control scheme for a WBAN. The proposed scheme makes use of a group-based user access ID, an access privilege mask, and a password. An elliptic curve cryptography-based public key cryptosystem is used to ensure that a particular legitimate user can only access the information for which he/she is authorized. We show that our scheme performs better than previously existing user access control schemes. Through a security analysis, we show that our scheme is secure against possible known attacks. Furthermore, through a formal security verification using the AVISPA (Automated Validation of Internet Security Protocols and Applications) tool, we show that our scheme is also secure against passive and active attacks.

Are buildings only instances?: exploration in architectural style categories

Abstract: Instance retrieval has emerged as a promising research area with buildings as the popular test subject. Given a query image or region, the objective is to find images in the database containing the same object or scene. There has been a recent surge in efforts in finding instances of the same building in challenging datasets such as the Oxford 5k dataset [19], Oxford 100k dataset and the Paris dataset [20].We ascend one level higher and pose the question: Are Buildings Only Instances? Buildings located in the same geographical region or constructed in a certain time period in history often follow a specific method of construction. These architectural styles are characterized by certain features which distinguish them from other styles of architecture. We explore, beyond the idea of buildings as instances, the possibility that buildings can be categorized based on the architectural style. Certain characteristic features distinguish an architectural style from others. We perform experiments to evaluate how characteristic information obtained from low-level feature configurations can help in classification of buildings into architectural style categories. Encouraged by our observations, we mine characteristic features with semantic utility for different architectural styles from our dataset of European monuments. These mined features are of various scales, and provide an insight into what makes a particular architectural style category distinct. The utility of the mined characteristics is verified from Wikipedia.

Cascadable adiabatic logic circuits for low-power applications

Abstract: There have been several strategies proposed to realise adiabatic circuits. Most of them require a clock signal and also its complement form. In this investigation, the authors we propose a family of adiabatic circuits, which consist of two branches and which enable control of charging and discharging of the capacitive load only by the input signal, work with single time varying supply and with no need of complementary inputs. A mathematical expression has been developed to explain the energy dissipation in our adiabatic inverter circuit. Measurements of energy drawn, recovered and dissipated have been carried out through simulation and, they are the same as obtained from the theoretical expression. In the proposed circuit, the input and output logic levels are approximately the same and can be used for building cascaded logic circuits. The energy saving in this family is to the tune of 50% compared with CMOS circuits constructed with similar circuit parameters, up to 250 MHZ. The authors have described the proposed inverter, NAND gates, NOR gates, adder circuits and JK flip-flop along with their simulation results.

Authentication protocols for the internet of drones: taxonomy, analysis and future directions

Abstract: The Internet of Drones (IoD) provides the coordinated access to controlled airspace for the Unmanned Aerial Vehicles (called drones). The on-going cheaper costs of sensors and processors, and also wireless connectivity make it feasible to use the drones for several applications ranging from military to civilian. Since most of the applications using the drones involved in the IoD are real-time based applications, the users (external parties) usually have their interest in getting the real-time services from the deployed drones belonging to a particular fly zone. To address this important issue in the IoD, there is a great need of an efficient and secure user authentication approach in which an authorized user (for example, a driver of an ambulance) in the IoD environment can be given access to the data directly from an accessed drone. In this article, we first discuss an authentication model used in the IoD communication. We then discuss some security challenges and requirements for the IoD environment. A taxonomy of various security protocols in the IoD environment is also discussed. We then emphasis on the study of some recently proposed user authentication schemes for the IoD communication. A detailed comparative study is done based on functionality features, security attacks, and also communication and computation costs. Through the rigorous comparative study of the existing schemes, we identify the strengths and weaknesses of the user authentication schemes for the IoD communication. Finally, we identify some of the challenges for the IoD that need to be addressed in the coming future.