One of the key problems of computervision and automated surveillance is to determine if two snapshots of objects in a video feed correspond to the same real one. In this paper we propose an efficient GPGPU based syst...
详细信息
ISBN:
(纸本)9781467325851;9781467325837
One of the key problems of computervision and automated surveillance is to determine if two snapshots of objects in a video feed correspond to the same real one. In this paper we propose an efficient GPGPU based system for short-term matching of people in a video feed. The main contributions of our approach consist of image enhancement techniques, data preprocessing methods based on statistical sampling combined with local algorithms for finding Voronoi diagrams and efficient similarity metric based on non crossing maximum matchings in weighted graphs. Our algorithms, thanks to their local nature, are easily parallelized. We propose an implementation on GPGPU that allows real time computation in reasonable circumstances. Achieved results show that described algorithms may be used in a variety of contexts.
The combined use of mice that have genetic mutations (transgenic mouse models) of human pathology and advanced neuroimaging methods (such as MRI) has the potential to radically change how we approach disease understan...
详细信息
ISBN:
(纸本)9781467325851;9781467325837
The combined use of mice that have genetic mutations (transgenic mouse models) of human pathology and advanced neuroimaging methods (such as MRI) has the potential to radically change how we approach disease understanding, diagnosis and treatment. Morphological changes occurring in the brain of transgenic animals as a result of the interaction between environment and genotype, can be assessed using advanced image analysis methods, an effort described as "mouse brain phenotyping". However, the computational methods required for the analysis of high-resolution brain images are demanding. In this paper, we propose a computationally effective cloud-based implementation of morphometric analysis of high-resolution mouse brain datasets. We show that the proposed approach is highly scalable and suited for a variety of methods for MR-based brain phenotyping. The proposed approach is easy to deploy, and could become an alternative for laboratories that may require instant access to large high performance computing infrastructure.
Human pose estimation is the process of approximating the configuration of the body39;s underlying skeletal articulation in one or more frames. The curve-skeleton of an object is a line-like representation that pres...
详细信息
ISBN:
(纸本)9781467325851;9781467325837
Human pose estimation is the process of approximating the configuration of the body's underlying skeletal articulation in one or more frames. The curve-skeleton of an object is a line-like representation that preserves topology and geometrical information. Finding the curve-skeleton of a volume corresponding to the person is a good starting point for approximating the underlying skeletal structure. In this paper a GPU implementation of a fully parallel thinning algorithm based on the critical kernels framework is presented. The algorithm is compared to another state-of-the-art thinning method, and while it is demonstrated that both achieve real-time frame rates, the proposed algorithm yields superior accuracy and robustness when used in a pose estimation context. The GPU implementation is > 8 x faster than a sequential version, and the positions of the four extremities are estimated with rms error similar to 6 cm and similar to 98 % of frames correctly labelled.
The visual world composed by the human and computational cognitive systems strongly relies on shapes of objects. Skeleton is a widely applied shape feature that plays an important role in many fields of image processi...
详细信息
ISBN:
(纸本)9781467351881;9781467328913
The visual world composed by the human and computational cognitive systems strongly relies on shapes of objects. Skeleton is a widely applied shape feature that plays an important role in many fields of imageprocessing, pattern recognition, and computervision. Thinning is a frequently used, iterative object reduction strategy for skeletonization. Sequential thinning algorithms, which are based on contour tracking, delete just one border point at a time. Most of them have the disadvantage of order-dependence, i.e., for dissimilar visiting orders of object points, they may generate different skeletons. In this work, we give a survey of our results on order-independent thinning: we introduce some sequential algorithms that produce identical skeletons for any visiting orders, and we also present some sufficient conditions for the order-independence of template-based sequential algorithms.
Gaussian convolution is of fundamental importance in linear scale-space theory and in numerous applications. We introduce iterated extended box filtering as an efficient and highly accurate way to compute Gaussian con...
详细信息
ISBN:
(纸本)9783642247842
Gaussian convolution is of fundamental importance in linear scale-space theory and in numerous applications. We introduce iterated extended box filtering as an efficient and highly accurate way to compute Gaussian convolution. Extended box filtering approximates a continuous box filter of arbitrary non-integer standard deviation. It provides a much better approximation to Gaussian convolution than conventional iterated box filtering. Moreover, it retains the efficiency benefits of iterated box filtering where the runtime is a linear function of the image size and does not depend on the standard deviation of the Gaussian. In a detailed mathematical analysis, we establish the fundamental properties of our approach and deduce its error bounds. An experimental evaluation shows the advantages of our method over classical implementations of Gaussian convolution in the spatial and the Fourier domain.
Adoption of machine vision inspection and computerimageprocessing technology, an oil-seal dimension measuring system was developed to meet the requirement of online production and real time inspection. The makeup an...
详细信息
ISBN:
(纸本)9783037852866
Adoption of machine vision inspection and computerimageprocessing technology, an oil-seal dimension measuring system was developed to meet the requirement of online production and real time inspection. The makeup and principle of the system were introduced, as well as its working process and design requirements were described on detailed. The technique of quadratic filtering for image preprocessing combined with the principle of three points determining a circle, point Hough transform and the least squares was employed for imageprocessing algorithm, and high precision sub-pixel edge detection was achieved. The measuring results of experiments demonstrated that the inspection goal on 100 percents of products could be realized successfully, and with many advantages such as non-contact, on-line, real time, appropriate precision and low cost, the system can be applied widely in other production fields.
Human-computer interaction (HCI) is an emerging field of science aimed at providing natural ways for humans to use computers. There are various approaches to build mouse alternatives. Unfortunatelly, many existing sol...
详细信息
ISBN:
(纸本)9783642311963
Human-computer interaction (HCI) is an emerging field of science aimed at providing natural ways for humans to use computers. There are various approaches to build mouse alternatives. Unfortunatelly, many existing solutions are not designed for people with severe physical disabilities. he work presented here is part of the larger project and focusses on facial action recognition framework and its components. It uses only optical observation - camera and image analysis and recognition algorithms. Proposed system gives possibility to serve the special needs of people with various disabilities, especially to use computers and possibly other devices. Consequently, in our opinion, it can offer disabled people access to a wide range of services which help them to participate more fully in society.
machine vision system was developed for rice quality detection in this paper. The main characteristics of rice appearance including area, perimeter, roughness and minimum enclosing rectangle were calculated by image a...
详细信息
ISBN:
(数字)9783642340383
ISBN:
(纸本)9783642340376
machine vision system was developed for rice quality detection in this paper. The main characteristics of rice appearance including area, perimeter, roughness and minimum enclosing rectangle were calculated by image analysis. The Least Squares Support Vector Machines was applied for the classification of head rice and broken rice. Genetic algorithm was used to optimize the parameters values of Least Squares Support Vector Machines. The robustness of this classification method was testified, and the experiment result shows that the head rice and broken rice can be effectively identified by Least Squares Support Vector Machines using machine vision.
Based on micro-image, the material identification of iron and copper debris in working oil of engineering equipment is researched. By selecting four characteristic parameters of debris image, a debris recognition clas...
详细信息
ISBN:
(纸本)9783037853726
Based on micro-image, the material identification of iron and copper debris in working oil of engineering equipment is researched. By selecting four characteristic parameters of debris image, a debris recognition classifier is designed based on multi-SVM. The materials and types of debris can be fast identified after the model is trained and the identification accuracy is high, thus a new method for fault diagnosis of engineering equipment is provided.
We investigate coercive objective functions composed of a data-fidelity term and a regularization term. Both of these terms are non differentiable and non convex, at least one of them being strictly non convex. The re...
详细信息
ISBN:
(纸本)9783642247842
We investigate coercive objective functions composed of a data-fidelity term and a regularization term. Both of these terms are non differentiable and non convex, at least one of them being strictly non convex. The regularization term is defined on a class of linear operators including finite differences. Their minimizers exhibit amazing properties. Each minimizer is the exact solution of an (overdetermined) linear system composed partly of linear operators from the data term, partly of linear operators involved in the regularization term. This is a strong property that is useful when we know that some of the data entries are faithful and the linear operators in the regularization term provide a correct modeling of the sought-after image or signal. It can be used to tune numerical schemes as well. Beacon applications include super resolution, restoration using frame representations, inpainting, morphologic component analysis, and so on. Various examples illustrate the theory and show the interest of this new class of objectives.
暂无评论