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检索条件"机构=Lab. for Computer Vision and Media Technology"

共 278 条记录，以下是81-90 订阅

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Exploiting colour information for better scene text recognition 25

Exploiting colour information for better scene text recognit...

引用

25th British Machine vision Conference, BMVC 2014

作者： Fraz, Muhammad Sarfraz, M. Saquib Edirisinghe, Eran A. Department of Computer Science Loughborough University Loughborough United Kingdom Computer Vision for Human Computer Interaction Lab. Karlsruhe Institute of Technology Karlsruhe Germany

This paper presents an approach to text recognition in natural scene images. The main contribution of this paper is the efficient exploitation of colour information for the identification of text regions in the presence of surrounding noise. We propose a pipeline of image processing operations involving the bilateral regression for the identification of characters in the images. A pre-processing step has been proposed to increase the performance of bilateral regression based character identification. The proposed method segments the characters so well that a combination of an off the shelf feature representation and classification technique achieves state-of-the-art character recognition performance. The capability of the framework is further extended for word recognition where a basic string matching criterion is applied to match recognized strings against a lexicon to eliminate errors that occur due to inaccuracies in character classification. We performed extensive experiments to evaluate our method on challenging datasets (Chars74K, ICDAR03, ICDAR11 and SVT) and results show that the proposed method superseded the existing state-of-the-art techniques. © 2014. The copyright of this document resides with its authors.

关键词： Image processing

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How Behavior Trees modularize robustness and safety in hybrid systems

How Behavior Trees modularize robustness and safety in hybri...

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2014 IEEE/RSJ International Conference on Intelligent Robots and Systems, IROS 2014

作者： Colledanchise, Michele Ögren, Petter Computer Vision and Active Perception Lab. School of Computer Science and Communication KTH - Royal Institute of Technology StockholmSE-100 44 Sweden

ISBN: (纸本)9781479969340

Behavior Trees (BTs) have become a popular framework for designing controllers of in-game opponents in the computer gaming industry. In this paper, we formalize and analyze the reasons behind the success of the BTs using standard tools of robot control theory, focusing on how properties such as robustness and safety are addressed in a modular way. In particular, we show how these key properties can be traced back to the ideas of subsumption and sequential compositions of robot behaviors. Thus BTs can be seen as a recent addition to a long research effort towards increasing modularity, robustness and safety of robot control software. To illustrate the use of BTs, we provide a set of solutions to example problems. © 2014 IEEE.

关键词： Hybrid systems

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Flooding based superpixels generation with color, compactness and smoothness constraints

Flooding based superpixels generation with color, compactnes...

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作者： Pan, Xiao Zhou, Yuanfeng Zhang, Caiming Liu, Qian School of Computer Science and Technology Shandong University Jinan China Shandong Key Lab. of Digital Media Technology Shandong University of Finance and Economics Jinan China

ISBN: (纸本)9781479957514

Superpixel generation is widely used in image segmentation. In this paper, we present an efficient flooding based superpixel generation algorithm. A new distance metric is defined for estimating pixels and seeds' similarity with COLOR, COMPACTNESS and SMOOTHNESS constraints. A seeds update strategy based on Lloyd's algorithm is adopted for optimizing seeds and superpixels' contour regions. Experimental results show our algorithm outperforms the existing methods. Boundaries of superpixels generated by our algorithm can fit the original image boundaries better. © 2014 IEEE.

关键词： Image segmentation

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Fast and robust image segmentation using an superpixel based FCM algorithm

Fast and robust image segmentation using an superpixel based...

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作者： Jia, Shixiang Zhang, Caiming School of Computer Science and Technology Shandong University Jinan China Shandong Key Lab. of Digital Media Technology Shandong University of Finance and Economics Jinan China

ISBN: (纸本)9781479957514

Through semantically grouping pixels in local neighborhoods, superpixels can capture image redundancy and significantly improve the performance of post-processing algorithms. In this paper, we investigate the application of superpixels in FCM framework, and propose a modified FCM algorithm SPFCM which utilizes superpixels as clustering objects instead of pixels. Superpixel and its neighborhood increase the clustering granularity and allow us to compute the objective function on a naturally adaptive domain rather than on a fixed window, so our algorithm can make full use of the spatial information and is more robust to noise. Due to the compact image representation based on superpixels, the computational complexity of our method is also drastically reduced. Experimental results on both synthetic and real images demonstrate the effectiveness and efficiency of our algorithm. © 2014 IEEE.

关键词： Image segmentation

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Socially engaged arts practice in HCI

Socially engaged arts practice in HCI

引用

32nd Annual ACM Conference on Human Factors in Computing Systems, CHI EA 2014

作者： Clarke, Rachel Heitlinger, Sara Briggs, Jo Crivellaro, Clara Light, Ann Culture Lab. School of Computing Science Newcastle University United Kingdom Media and Art Technology Electronic Engineering and Computer Science Queen Mary University of London United Kingdom Media and Communication Design Northumbria University United Kingdom

ISBN: (纸本)9781450324748

Socially engaged methods are increasingly being used within HCI research, yet arts practice in this context has been little explored. HCI research that aligns with socially engaged arts practices encourages debate around societal challenges;for example discussion of issues surrounding the role of digital technology in sustainability, inclusion, community, identity and the politics of participation. Building on existing research, this workshop will bring together a diverse group of HCI researchers, artists and other creators whose work or interests align with socially engaged arts practice, to foster critical exploration and creative collab.ration.

关键词： Human computer interaction

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Hybrid Kinect Depth Map Refinement for Transparent Objects

Hybrid Kinect Depth Map Refinement for Transparent Objects

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International Conference on Pattern Recognition

作者： Gorkem Saygili Laurens Van Der Maaten Emile A. Hendriks Computer Vision Lab. Delft University of Technology Netherlands Comput. Vision Lab. Technische Universiteit Delft Delft Zuid-Holland NL

ISBN: (纸本)9781479952106

Depth sensors such as Kinect fail to find the depth of transparent objects which makes 3D reconstruction of such objects a challenge. The refinement algorithms for Kinect depth maps either do not address transparency or they only provide sparse depth on such objects which is inadequate for dense 3D reconstruction. In order to solve this problem, we propose a fully-connected CRF based hybrid refinement algorithm. We incorporate stereo cues from cross-modal stereo between IR and RGB cameras of the Kinect and Kinect's depth map. Our algorithm does not require any additional cameras and still provides dense depth estimations of transparent objects and specular surfaces with high accuracy.

关键词： Estimation Cameras Sensors Accuracy Three-dimensional displays Inference algorithms Surface reconstruction

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Towards a unified behavior trees framework for robot control

Towards a unified behavior trees framework for robot control

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Alejandro Marzinotto Michele Colledanchise Christian Smith Petter Ögren Computer Vision and Active Perception Lab. Royal Institute of Technology (KTH) Stockholm Sweden

This paper presents a unified framework for Behavior Trees (BTs), a plan representation and execution tool. The availab.e literature lacks the consistency and mathematical rigor required for robotic and control applications. Therefore, we approach this problem in two steps: first, reviewing the most popular BT literature exposing the aforementioned issues; second, describing our unified BT framework along with equivalence notions between BTs and Controlled Hybrid Dynamical Systems (CHDSs). This paper improves on the existing state of the art as it describes BTs in a more accurate and compact way, while providing insight about their actual representation capabilities. Lastly, we demonstrate the applicability of our framework to real systems scheduling open-loop actions in a grasping mission that involves a NAO robot and our BT library.

关键词： Vehicles Tin Robots Trajectory Heuristic algorithms Synchronization

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How Behavior Trees modularize robustness and safety in hybrid systems

How Behavior Trees modularize robustness and safety in hybri...

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2014 IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Michele Colledanchise Petter Ögren Computer Vision and Active Perception Lab. KTH - Royal Institute of Technology Stockholm Sweden

关键词： Safety Robustness Robots Switches computers Games Vehicles

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Mapping human intentions to robot motions via physical interaction through a jointly-held object

Mapping human intentions to robot motions via physical inter...

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IEEE International Workshop on Robot and Human Communication (ROMAN)

作者： Yiannis Karayiannidis Christian Smith Danica Kragic Computer Vision and Active Perception Lab. Royal Institute of Technology (KTH) Stockholm Sweden

In this paper we consider the problem of human-robot collab.rative manipulation of an object, where the human is active in controlling the motion, and the robot is passively following the human's lead. Assuming that the human grasp of the object only allows for transfer of forces and not torques, there is a disambiguity as to whether the human desires translation or rotation. In this paper, we analyze different approaches to this problem both theoretically and in experiment. This leads to the proposal of a control methodology that uses switching between two different admittance control modes based on the magnitude of measured force to achieve disambiguation of the rotation/translation problem.

关键词： Switches Force Robot sensing systems Admittance Rotation measurement Torque

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Online contact point estimation for uncalibrated tool use

Online contact point estimation for uncalibrated tool use

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Yiannis Karayiannidis Christian Smith Francisco E. Viña Danica Kragic Computer Vision and Active Perception Lab. Royal Institute of Technology (KTH) Stockholm Sweden

One of the big challenges for robots working outside of traditional industrial settings is the ability to robustly and flexibly grasp and manipulate tools for various tasks. When a tool is interacting with another object during task execution, several problems arise: a tool can be partially or completely occluded from the robot's view, it can slip or shift in the robot's hand - thus, the robot may lose the information about the exact position of the tool in the hand. Thus, there is a need for online calibration and/or recalibration of the tool. In this paper, we present a model-free online tool-tip calibration method that uses force/torque measurements and an adaptive estimation scheme to estimate the point of contact between a tool and the environment. An adaptive force control component guarantees that interaction forces are limited even before the contact point estimate has converged. We also show how to simultaneously estimate the location and normal direction of the surface being touched by the tool-tip as the contact point is estimated. The stability of the the overall scheme and the convergence of the estimated parameters are theoretically proven and the performance is evaluated in experiments on a real robot.

关键词： Force Estimation Torque measurement Torque Force measurement Robot sensing systems

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