1,721,076 research outputs found
Automatic detection and indexing of video-event shots for surveillance applications
No full textIncreased communication capabilities and automatic scene understanding allow human operators to simultaneously monitor multiple environments. Due to the amount of data to be processed in new surveillance systems, the human operator must be helped by automatic processing tools in the work of inspecting video sequences. In this paper, a novel approach allowing layered content-based retrieval of video-event shots referring to potentially interesting situations is presented. Interpretation of events is used for defining new video-event shot detection and indexing criteria. Interesting events refer to potentially dangerous situations: abandoned objects and predefined human events are considered in this paper. Video-event shot detection and indexing capabilities are used for online and offline content-based retrieval of scenes to be detected
Dual camera system for face detection in unconstrained environments
No full textA system for face detection in outdoor environments for multisensor video surveillance applications is presented. The system is characterized by a combination of two pan-tilt video cameras, which cooperate in order to track and to characterize moving objects with positioning and biometric informations. The final result of the action of the system is the collection of small video shots regarding the face of humans detected in outdoor environments with a robust behavior.A system 1 for face detection in outdoor environments for multisensor video surveillance applications is presented. The system is characterized by a combination of two pantilt video cameras, which cooperate in order to track and to characterize moving objects with positioning and biometric informations. The final result of the action of the system is the collection of small video shots regarding the face of humans detected in outdoor environments with a robust behavior
Configuring an Intelligent Reflecting Surface for Wireless Communications : Highlights from the 2021 IEEE Signal Processing Cup student competition [SP Competitions]
No full textThe shape of a surface determines how it interacts with wireless radio-frequency signals. Taking a homogenous metal plate as an example, we can bend and rotate it in different ways to make the incident wireless signal become diffusely or specularly reflected in the desired manner. The same effect can be electronically achieved by using an intelligent reflecting surface (IRS), which is a 2D array of metamaterials. By creating heterogeneous impedance variations over the surface, we can synthesize the reflection of a bent and rotated surface but without any mechanical manipulations.</p
Real-time change detection methods for video-surveillance systems with mobile camera
No full textIn this paper, a video-surveillance system based on a mobile-camera is presented. The proposed real-time method is able to detect an object in a video sequence from a non-static camera. In particular during an off-line phase the system creates a panoramic multi-layer background image. In the on-line phase the system compares the acquired images with a portion of the panoramic background. Different change detection methods are analyzed. Experimental results are presented in order to validate the proposed methods. The proposed method could be used for extending efficient algorithms for scene understanding already developed and tested for fixed cameras to a mobile camera environment
Adaptive change detection approach for object detection in outdoor scenes under variable speed illumination changes
No full textIn this paper an adaptive algorithm is presented for the detection of changes in outdoor video-surveillance images. The proposed method can be considered as basis for a low level image processing stage in a advanced video-surveillance system. The main feature of the algorithm is the robustness to the illumination changes in the scene: this robustness is achieved by using a background updating module working in cooperation with the change detection algorithm. The background updating method works in a different way according to speed of illumination changes. If a sudden illumination change is detected the background is heavily updated while if a slow lightning variation occurs, a continuous soft updating module is used to take into account the long-term slow illumination changes. Experimental results of an automatic people counting system including the proposed low level image processing stage indicate that the method detects changes accurately in case of time-varying illumination
Unsupervised Anomaly Detection Using Intelligent and Heterogeneous Autonomous Systems: Highlights from the 2020 IEEE Signal Processing Cup Student Competition [SP Competitions]
No full textIntegrated Sensing and Communication for Joint GPS Spoofing and Jamming Detection in Vehicular V2X Networks
No full textVehicle-to-everything (V2X) communication is expected to be a prominent component of the sixth generation (6G) to accomplish intelligent transportation systems (ITS). Autonomous vehicles relying only on onboard sensors cannot bypass the limitations of safety and reliability. Thus, integrated sensing and communication is proposed as an effective way to achieve high situational- and self-awareness levels, enabling V2X to perceive the physical world and adjust its behaviour to emergencies. Secure navigation through the Global Positioning System (GPS) is essential in ITS for safe operation. Nevertheless, due to the lack of encryption and authentication mechanisms of civil GPS receivers, spoofers can easily replicate satellite signals by launching GPS spoofing attacks to deceive the vehicle and manipulate navigation data. In addition, due to its shared nature, V2X links are prone to jamming attacks which might endanger vehicular safety. This paper proposes a method to jointly detect GPS spoofing and jamming attacks in a V2X network. Simulation results demonstrate that the proposed method can detect spoofers and jammers with high detection probabilities
Towards cheap scalable browser multiplayer
No full textThe barrier to entry for the development of independent, browser-based multiplayer games is high for two reasons: complexity and cost. In this work, we introduce and evaluate a method and library that aims to make this barrier as small as possible, by utilising appropriate development abstractions and peer-to-peer communication between players. Our preliminary evaluation shows that we can lower both the technical development overhead, as well as minimise server costs, at no loss to performanc
Forensic Camera Model Identification: Highlights from the IEEE Signal Processing Cup 2018 Student Competition [SP Competitions]
No full textChange detection methods for automatic scene analysis by using mobile surveillance cameras
No full textThis paper proposes a video-surveillance system based on a mobile camera. In particular the developed system creates (during the off-line phase) a panoramic multilayer background image allowing one to use common change detection algorithms to search for a change detection binary image. Different approaches to get the change detection images are presented. The performances of the implemented algorithms are presented by using ROC curves
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