A technique is presented for calibrating and rectifying in a very efficient and simple manner pairs or triplets of images taken for binocular or trinocular stereovision systems. After the rectification of images, epip...
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ISBN:
(纸本)0818608781
A technique is presented for calibrating and rectifying in a very efficient and simple manner pairs or triplets of images taken for binocular or trinocular stereovision systems. After the rectification of images, epipolar lines are parallel to the axes of the image coordinate frames. therefore, potential matches between two or three images satisfy simpler relations, allowing for simpler and more efficient matching algorithms. Experimental results obtained with binocular and a trinocular stereovision system are presented, and a complexity analysis is provided.
the complexity of efficiently programming massively parallel machines is illustrated by presenting a number of algorithms. these algorithms deal with computational geometry, data histogramming, list manipulation, and ...
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the complexity of efficiently programming massively parallel machines is illustrated by presenting a number of algorithms. these algorithms deal with computational geometry, data histogramming, list manipulation, and other problems or operations that arise in computer vision tasks. All of the algorithms presented use a divide-and-conquer strategy, and they all use routines that solve a problem of size M using a machine size N, where M >
OPSILA, is a description given of a general-purpose parallel architecture with two different forms of parallelism: the well-known SIMD (single-instruction, multiple data shown), a synchronous form of parallelism; and ...
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OPSILA, is a description given of a general-purpose parallel architecture with two different forms of parallelism: the well-known SIMD (single-instruction, multiple data shown), a synchronous form of parallelism; and SPMD (single program, multiple data stream), which is an asynchronous mode. It is shown that OPSILA is efficient for a wide variety of image algorithms including low and high level processing. the efficiency of OPSILA is demonstrated for the low-level algorithms, through the implementation of a set of typical operations: local (convolution), global (histogram), and geometric corrections.< >
the split-level relaxation technique is analyzed in a parallelprocessing framework. It is shown that there is much parallelism inherent in the algorithm that can be exploited. this has been confirmed by implementatio...
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ISBN:
(纸本)0818608781
the split-level relaxation technique is analyzed in a parallelprocessing framework. It is shown that there is much parallelism inherent in the algorithm that can be exploited. this has been confirmed by implementation of the algorithm on an actual multiprocessor. Although the results are good, the implementation can be made more efficient. the use of multiple queues instead of a centralized queue can reduce memory contention, particularly in large multiprocessors. An asynchronous implementation can also improve the performance.
An approach to color image representation is described that allows high accuracy in the spectral dimension and that leads to possibilities in color image analysis and to novel analysis methods. A color image can be st...
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ISBN:
(纸本)0818608781
An approach to color image representation is described that allows high accuracy in the spectral dimension and that leads to possibilities in color image analysis and to novel analysis methods. A color image can be stored into the same space in the computer's memory as a conventional red, green, and blue image, which makes it possible to reconstruct the whole color spectrum of each pixel. Fast optically realizable parallelprocessing implementations are also discussed.
A multilayer hierarchical scheme, designed for parallelprocessing implementation, is proposed for the extraction of global attributed representations from spatial domain images. the input to this scheme is defined ov...
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ISBN:
(纸本)0818608781
A multilayer hierarchical scheme, designed for parallelprocessing implementation, is proposed for the extraction of global attributed representations from spatial domain images. the input to this scheme is defined over an array of input cells that take values over a set of local image primitivaes. A global representation in the form of an attributed relational graph is extracted from the input using a technique that hierarchically groups the local primitives into global features and relations.
the problem addressed in this work is the construction of a description of a digital image using a kind of parallel rewriting system, the conditional attributed L-system. To this end, descriptions of digital images an...
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ISBN:
(纸本)0818608781
the problem addressed in this work is the construction of a description of a digital image using a kind of parallel rewriting system, the conditional attributed L-system. To this end, descriptions of digital images and digital structures are first defined. then, attributed conditional L-systems capable of parallel rewriting are introduced. these systems are concise and readable, and their suitability for image description is shown by an example. Advantages and disadvantages of their use are discussed.
A parallelthinning algorithm of C. M. Holt et al. (1987) is compared with an algorithm by D. Rutovitz (1966) and one by T. Y. Zhang and C. Y. Suen (1984). Analyses and experiments show that the Holt algorithm is simi...
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ISBN:
(纸本)0818608781
A parallelthinning algorithm of C. M. Holt et al. (1987) is compared with an algorithm by D. Rutovitz (1966) and one by T. Y. Zhang and C. Y. Suen (1984). Analyses and experiments show that the Holt algorithm is similar to the Rutovitz algorithm. A heuristic modification to Rutovitz' algorithm is also proposed and the modified algorithm is faster than Holt's algorithm.
A smoothing method based on the simultaneous processing of the distance transforms of the figure and of its complement is described. this method can be regarded as a tool to enrich the set of the picture modifications...
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ISBN:
(纸本)0818608781
A smoothing method based on the simultaneous processing of the distance transforms of the figure and of its complement is described. this method can be regarded as a tool to enrich the set of the picture modifications that are achievable by using distance transformations. Both figure protrusions and dents are modified within the same process in a parallel fashion. In the standard method based on the application of a suitable sequence of shrink and expand operations, figure protrusions and dents are modified within two distinct processes. thus, the proposed method is computationally more convenient than the sequence of the two previous processes.
Describes the architecture of a mesh array smart sensor, in close relation withthe algorithms to be carried out by it. On the one hand, a monolithic implementation of the mesh array is a logical consequence of its de...
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Describes the architecture of a mesh array smart sensor, in close relation withthe algorithms to be carried out by it. On the one hand, a monolithic implementation of the mesh array is a logical consequence of its design requirements within the framework of full custom integration. On the other hand, today's implementations are limited to Boolean picture processing and binary picture memorization if sensible size pictures are to be handled. Nevertheless, the validity of these choices is confirmed by a 50-mm/sup 2/ area (60*60PE) chip which has been laid out in a 2- mu m two-metal CMOS technology.< >
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