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This paper describes a method for the real-time vehicle queue estimation of large-scale traffic scene. The method is based on improving the vehicle presence detection and movement analysis method to combine the temporal and spatial information of neighbor frame images, and adding a mechanism for eliminating false detection. The results of experiments are presented by estimating queue length from the...
It is well known that star sensor is an accurate attitude sensor in various real applications, which however has not been fully used to observe stars and the moon simultaneously. This paper investigates how the moon and stars can be observed by the star sensor, and how to process the images taken under different light conditions to extract information to determine attitude and location of the observer...
Recently, there has been growing interest in developing rotorcraft unmanned aircraft system (RUAS) based on visual sensors. Among basic phases for autonomous flight, autonomous landing is the most challenging process. For most of RUAS, visual sensors are widely used during the landing maneuver. This paper first gives a classification of landmarks on the helipad and summarizes the general implementation...
Network Zoning is a key problem for the coordination in hierarchical control system. In traffic control area, considering the characteristics of road network, like directed and spatial property, we give one appropriate method for network zoning. Inheriting the advantages of several community detection methods, this method takes the distance between intersections and the scale of intersection into...
Dynamic changes and uncertainty in traffic environments directly spawned lots of strategies about traffic signal control (TSC). Meanwhile, the differences in the traffic environment and demand of control have a significant impact on the performance of strategies about TSC. In order to enable dynamic selection of the most appropriate TSC agents for each specific traffic state in urban traffic transportation...
Rate distortion of Intra-Frame (I-frame) plays a significant role in controlling video quality. Aiming at the deficiency of I-frame rate control of H.264, this paper presents a novel I-frame rate estimation method for H.264 rate control. Firstly, Rate-Complexity-Qstep (RCQ) model of I-frame was gotten by curve fitting, secondly, the information of encoded frames was used to update I-frame weight relative...
To improve the efficiency of automotive software design and meet the complexity of real-time distributed system, this paper brings out an integrated software development and validation platform, which is based on a real-time, OSEK/VDX compliant Control Application Specific Operating System (CASOS-OSEK). System time and power constrained analysis is presented as case study.
Bus rapid transit (BRT) system is the key technology of intelligent transportation systems (ITS). This paper is about the research on a hierarchical BRT system based on multi-tier wireless sensor networks (WSN). It maps the features of WSN to BRT system and provides solutions for BRT technologies, such as transit signal priority.
With the enormous market potentials of telematics industry and for further gains in safety and convenience, automotive telematics has become a hot R&D area in mobile computing and ITS. Quite a number of telematics services have been proposed by automakers and third-party service providers. This paper describes an OSGi based in-vehicle telematics service platform, by which telematics services can...
This paper presents a novel automatic and dynamic camera calibration algorithm based on traffic visual surveillance. The algorithm can automatically calibrate the intrinsic and extrinsic parameters of camera, and offer enough guarantee to extract traffic real-time parameters. This paper firstly indicates the significance of applying automatic and dynamic calibration algorithm to intelligent transportation...
After modeling distributed embedded systems using time Petri nets based on resources, scheduling analysis is complex. Therefore, the combination and decomposition of scheduling sequences are introduced to simplify the analysis of complex scheduling sequences. Then two simplification rules are introduced to simplify the time constriction of every transition in scheduling sequence. At last, all properties...
A vehicle model integrating different factors which affect vehicle dynamics is needed for the design of advanced vehicle safety control systems. In this paper, we first present a design architecture for the modeling of vehicle dynamics, which can adopt different tire friction models. Then, we combine a tow-track chassis model, an aerodynamic model and LuGre based 2D tire model to get a new vehicle...
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