Encontrados 5 documentos, a visualizar página 1 de 1
A new method for the detection of singular points in fingerprint images
Filipe Tiago Alves de Magalhães; Hélder Filipe Pinto de Oliveira; Aurélio Joaquim de Castro CampilhoAutomatic biometric identification based on fingerprints is still one of the most reliable identification method in criminal and forensic applications. A critical step in fingerprint analysis without human intervention is to automatically and reliably extract singular points from the input fingerprint images. These singular points (cores and deltas) not only represent the characteristics of local ridge patterns...
Image retargeting using stable paths
Hélder Filipe Pinto de Oliveira; Jaime dos Santos CardosoMedia content adaptation is the action of transforming media files to adapt to device capabilities, usually related to mobile devices that require special handling because of their limited computational power, small screen size and constrained keyboard functionality. Image retargeting is one of such adaptations, transforming an image into another with different size. Tools allowing the author to imagery once an...
Precise modeling of a four wheeled omni-directional robot
Hélder Filipe Pinto de Oliveira; Armando Jorge Miranda de Sousa; António Paulo Gomes Mendes Moreira; Paulo José Cerqueira Gomes da CostaRecent applications in Autonomous Robotics are becoming more demanding every day. Modern Mobile Robots use Omni-Directional locomotion in order to achieve additional maneuverability and efficiency. These features are gained at the expense of increased mechanical complexity and increased complexity in control. Demanding applications require precise dynamical model in order to allow for precise locomotion. Dynami...
Dynamical models for omni-directional robots with 3 and 4 wheels
Hélder Filipe Pinto de Oliveira; Armando Jorge Miranda de Sousa; António Paulo Gomes Mendes Moreira; Paulo José Cerqueira Gomes da CostaOmni-directional robots are becoming more and more common in recent robotic applications. They offer improved ease of maneuverability and effectiveness at the expense of increased complexity. Frequent applications include but are not limited to robotic competitions and service robotics. The goal of this work is to find a precise dynamical model in order to predict the robot behavior. Models were found for two r...
Sensor and actuator modeling of a realistic wheeled mobile robot simulator
José Gonçalves; José Lima; Hélder Filipe Pinto de Oliveira; Paulo José Cerqueira Gomes da CostaThis paper describes the sensor and actuator modeling of a realistic wheeled mobile robot simulator. The motivation of developing such simulator is to produce a personalized versatile tool that allows production and validation of robot software reducing considerably the development time. The mobile robot simulator was developed in Object Pascal with its dynamics based on the ODE (Open Dynamics Engine), allowing...
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