The building of a virtual environment for the construction, analysis, and design of a three dimensional virtual manufacturing prototype is discussed. An agent-based framework is used to specify the visual environment....
详细信息
This paper presents a novel sonar sensor consisting of three transmitters and three receivers that can localise and classify 3D targets into 16 different naturally occurring indoor classes. The sensor produces submill...
详细信息
This paper presents a novel sonar sensor consisting of three transmitters and three receivers that can localise and classify 3D targets into 16 different naturally occurring indoor classes. The sensor produces submillimeter range and sub-degree bearing accuracies using an optimal matched filter time of flight estimator up to a range of 6 meters. The sensor configuration, hardware and processing are described. Experimental results from the sensor are presented.
This paper describes an ultrasonic sensor which uses the times of flight from three Polaroid ultrasonic transducers arranged in an equilateral triangle to identify and localise planes, 2D and 3D corners. The sensor em...
详细信息
This paper describes an ultrasonic sensor which uses the times of flight from three Polaroid ultrasonic transducers arranged in an equilateral triangle to identify and localise planes, 2D and 3D corners. The sensor employs a maximum likelihood estimator and a data acquisition system with a low sampling rate of about 59 kHz. The hardware and processing requirements are modest and fast due to the simple identification algorithms and sensor structure. Localisation of the objects can be achieved with range error of about 2 mm and bearing error of less than 1/spl deg/. The sensor has been applied to localising a robot in a known indoor environment using 3D natural features and has achieved accuracies of 1 cm in position and 2/spl deg/ in bearing.
This paper presents a statistical estimation from which a new objective function for exterior orientation from line correspondences is derived. The objective function is based on the assumption that the underlying noi...
详细信息
Shape memory alloy (SMA) based actuators have a number of attributes which make them useful for robotic applications. Unfortunately their response is relatively slow being limited by the speed with which the SMA can b...
详细信息
Shape memory alloy (SMA) based actuators have a number of attributes which make them useful for robotic applications. Unfortunately their response is relatively slow being limited by the speed with which the SMA can be heated and cooled. This paper describes two novel developments of the basic SMA actuator which improve dynamic performance. To allow rapid heating of the shape memory alloy wire without the danger of over heating an infrared temperature sensor is introduced. Cooling is improved with the aid of a mobile heat sink. These developments are described and preliminary results are presented.
This paper shows that categorical color developed in Yue Du (1994) is a good representation of color space for some robot vision tasks. The authors use SCARF as a test case to compare 'equivalent' RGB, categor...
详细信息
This paper shows that categorical color developed in Yue Du (1994) is a good representation of color space for some robot vision tasks. The authors use SCARF as a test case to compare 'equivalent' RGB, categorical color, and intensity robot vision algorithms on a difficult robot road following task. SCARF uses a full three-dimensional representation of color space to formulate road and off-road colors. Performing categorical color or intensity projection, the authors can model the road and off-road colors as single dimensional probability density functions. This greatly reduces the time to process the color image. Moreover, the authors show that categorical color is a good representation in that it outperforms an equivalent intensity algorithm on the robot tasks. Categorical color, while it cannot outperform the original RGB algorithm, performs well enough to be used in this particular robot application. Its effectiveness is verified by many experiments on difficult road image sequences.
Many current avenues of vision research involve fully analyzing an image with expensive, high powered computers. This approach has major implications in terms of cost, size, and power consumption. Other methods have i...
详细信息
Many current avenues of vision research involve fully analyzing an image with expensive, high powered computers. This approach has major implications in terms of cost, size, and power consumption. Other methods have involved sub-sampling an image to reduce cost and complexity. This has the disadvantage of information loss. We present a low cost, low powered, reduced complexity vision system capable of intelligently sampling an image to reduce this information loss. The design philosophy and methodology is discussed, along with sample applications. Primarily we demonstrate how the reduced complexity vision system will be used to aid in navigation of an autonomous flying vehicle. This is quantified by showing how having multiple sampling schemes result in increased robustness and accuracy of our helicopter line tracking algorithm.
A methodology for the mobility evaluation and mission oriented performance assessment of an autonomous mobile robot is developed. The evaluation strategy uses both time and energy based measures resulting in the devel...
详细信息
A methodology for the mobility evaluation and mission oriented performance assessment of an autonomous mobile robot is developed. The evaluation strategy uses both time and energy based measures resulting in the development of isochronal/isoenergy contours which characterize the expected mobility of the robot over novel terrain using sample trials on patches of land prior to the mission. This work has a basis in the evaluation of a robot for extraterrestrial exploration and demonstrates the feasibility of the evaluation methodology proposed using simulations. Simulation results are reported for two designs of micro-rovers viz. legged and wheeled on a simulated Martian terrain. Future work is discussed in the context of increased complexity due to hardware implementations, better terrain models and statistical simulations all of which are currently under development.
This paper discusses an architecture designed to provide support for the development of state transition models for an object-oriented distributed environment. The state transition models can be constructed and specif...
详细信息
This paper discusses an architecture designed to provide support for the development of state transition models for an object-oriented distributed environment. The state transition models can be constructed and specified hierarchically as well as derived into new classes of objects through the use of inheritance. A new concept called "exit-safe states" is introduced to assist in the specification of hierarchical state transition models. A graphical monitor to analyze the system at run time has been developed.
This paper presents an approach to the assembly sequence planning problem based on a "plan reuse" philosophy, called the Assembly Planner using Experience (APE). Assembly planning research in the past has at...
详细信息
This paper presents an approach to the assembly sequence planning problem based on a "plan reuse" philosophy, called the Assembly Planner using Experience (APE). Assembly planning research in the past has attempted to completely plan each problem from scratch. This research shows that stored cases of basic assembly configurations can be applied to a given assembly problem. It is observed that the number of such basic assembly configurations is quite small. Constraints affecting the assembly are also explicitly handled.
暂无评论