Corner Detection on hexagonal pixel based images

Corner detection is used in many computer vision applications that require fast and efficient feature matching. In addition, hexagonal pixel based images have been recently investigated for image capture and processing due to their ability to represent curved structures that are common in real images better than traditional rectangular pixel based images. Therefore, we present an approach to corner detection on hexagonal images and demonstrate that accuracy is comparable to well-known existing corner detectors applied to rectangular pixel based images

A reconfigurable context-a ware protocol stack for interplanetary communication

This paper presents an approach to improve transmission success in delay-tolerant networks. The context- aware broker (CAB) grants networking autonomy when communicating in challenging environments, which suffer from conditions which are variable and exceed the limits for which terrestrial protocols were designed. Such environments currently require human intervention and the manual configuration of each communication - a seemingly simple decision of when to transmit becomes an issue in deep space due to planet movement. However, manual configuration is becoming unrealistic, given the scale on which communications occur. CAB automates the process by making intelligent decisions before transmission begins, and reconfigures as it progresses. It recognises the dynamic environments through which a transmission may pass and matches protocol capabilities with environmental constraints

Operational performance of the Context-Aware Broker (CAB): A communication and management system for Delay-Tolerant Networks (DTNs)

Abstract—The Context-Aware Broker is a policy-based management system developed by the authors to achieve autonomic communication in delay-tolerant networks. This is in recognition of environment challenges when operating in remote regions, and time, human, and financial resource costs incurred during mission-specific configuration. The Context-Aware Broker seeks to limit cost overheads through achieving a standardised transmitting approach, and operating autonomically to optimise reliability and sustainability levels achieved. In achieving its network management function, a cost-benefit impact is the consequence. Performance results from the Context-Aware Broker’s deployment in ns-2.30 are presented and evaluated in this paper. Keywords-autonomy; context-awareness; delay-tolerant network; ns-2.3; policy-based management; quality of service. I

IIDWBA algorithm for integrated hybrid PON with wireless technologies for next generation broadband access networks

Optical and wireless technology integration has been proposed as one of the most promising nominees for the next-generation broadband access networks for quite some time. Integration scheme merges the high-speed and high-capacity of the optical networks with the low-cost, wide-coverage and mobility features of the wireless counterparts for the Subscriber Stations (SSs). It is also financially viable for the telecommunication service providers, particularly in the rural area where the development of optical infrastructure or expansion of the existing telecommunication solutions such as Digital Subscriber Line (DSL), Cable Modem (CM) or T-1/E-1 networks are either too costly or unreachable. In order to successfully integrate the two technologies, there are some technical concerns in terms of Architectural aspects, Physical Layer features and Media Access Control (MAC) related issues, which need to be addressed efficiently in order to provide the smooth end-to-end (e2e) integration. This paper is mainly focused upon the analysis of the key topics in MAC-related issues such as E2E wavelength/bandwidth requests and allocations over the converged scenario. It proposes an Inter-channel and Intra-channel Dynamic Wavelength/Bandwidth Allocation (IIDWBA) algorithm where the hybrid Passive Optical Network (PON) acts as a back haul technology for the wireless counterpart. The proposed algorithm works in three phases, namely, Initialisation, Intra-channel bandwidth allocations and Inter-channel bandwidth allocations and is capable of allocating wavelength/bandwidth efficiently and effectively over the converged scenario. Performance of the proposed algorithm is evaluated through conducted simulation scenarios under different simulation parameters, traffic patterns and load values. According to the captured results, IIDWBA algorithm shows a better performance when it is compared to the scenario in which it has not been employe