A method for reconstructing a polyhedral structure via a stereo analysis is presented. In this method, stereo matching is based on the adjacency structure of the edges of a polyhedron. then, from the resultant 3D line...
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A method for reconstructing a polyhedral structure via a stereo analysis is presented. In this method, stereo matching is based on the adjacency structure of the edges of a polyhedron. then, from the resultant 3D lines, the face candidates are extracted. through the use of the partial results, line patterns on the faces can be detected. through this process, one can also verify the existence of the faces and correct their structures. By utilizing the verified faces, it is possible to eliminate false faces by means of an ordering constraint. A polyhedral approximation is obtained when the faces are assembled.< >
the Laplacian of Gaussian operator, Del /sup 2/G, is very important as an edge detector in the theory of computervision. the bias of zero-crossing and output signal-to-noise-ratio of Del /sup 2/G under the models of ...
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ISBN:
(纸本)0818608781
the Laplacian of Gaussian operator, Del /sup 2/G, is very important as an edge detector in the theory of computervision. the bias of zero-crossing and output signal-to-noise-ratio of Del /sup 2/G under the models of four typical kinds of edges corrupted by white noise are given, and these theoretical results are confirmed by experiments. the relations among bias of zero-crossing, output and input signal-to-noise-ratio and parameter sigma of Del /sup 2/G are presented.< >
the process for fast extraction is divided into two steps: first, it looks for the areas where there might be ellipses by using heuristic function and a pyramid structure; then it finds the parameters of the ellipses ...
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ISBN:
(纸本)0818608781
the process for fast extraction is divided into two steps: first, it looks for the areas where there might be ellipses by using heuristic function and a pyramid structure; then it finds the parameters of the ellipses in each area searched by a method that combines transformation of the feature space, projection, and optimum approximation approaches. Experiments indicate that both fast processing speed and suitable ellipse parameters are obtained.< >
A rule-driven recognition system of a 3-D scene using range images is described. the system is constructed with a production system. A scene is described with simple a surface patch network (planar or quadric) by exam...
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A rule-driven recognition system of a 3-D scene using range images is described. the system is constructed with a production system. A scene is described with simple a surface patch network (planar or quadric) by examining the local curvature of objects. the region and edge network is interpreted with IF-thEN-like heuristic rules. the system can recognize smoothly joined curved surfaces and explain the structure of a scene consisting of plural objects. the experiments have been carried out with real range data.< >
Scale-space is a representation for detecting and organising intensity changes that occur at various scales in an image. A single-chip VLSI design is proposed for scale-space computation in one and two dimensions. the...
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Scale-space is a representation for detecting and organising intensity changes that occur at various scales in an image. A single-chip VLSI design is proposed for scale-space computation in one and two dimensions. the architecture of the chip is based on an algorithm that can provide speeds that are an order of magnitude higher than the speeds obtainable from the other systems proposed in the literature. the design uses the principles of modularity, expandability and parallelism, and fully utilizes the three properties of the Gaussian: symmetry, separability, and scaling. the proposed algorithm and the hardware architecture use a very high degree of pipelining and parallelism. the chip can be implemented in either nMOS or CMOS technology.< >
In order to avoid logical inconsistencies on the regular square raster, the foreground and the background in a binary image have to be treated differently during, for example, labelling or thinning operations. If the ...
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In order to avoid logical inconsistencies on the regular square raster, the foreground and the background in a binary image have to be treated differently during, for example, labelling or thinning operations. If the foreground is considered 8-connected, then the background has to be 4-connected, or vice versa. It is demonstrated that after certain topographic and possibly topological changes to a binary image, its foreground and background can both be considered 8-connected and the inconsistencies are eliminated. In particular, the foreground and background can be thinned using 8-connectivity. the erosion and dilatation problems that arise as a result of the changes can be overcome by constrained erosions and dilations which do not create possibilities of penetration or blocking of passages. After logical operations it is best to check the resultant image for penetration numbers.< >
In an automated photo-processing laboratory, the flow of photo-cassettes is controlled by a computer driven mechanical conveying system. Photo-cassettes must be identified in order to be correctly collected in specifi...
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ISBN:
(纸本)0948507128
In an automated photo-processing laboratory, the flow of photo-cassettes is controlled by a computer driven mechanical conveying system. Photo-cassettes must be identified in order to be correctly collected in specific magazines for further processing. An automatic identification system based on a gray-level visual patternrecognition of label printing structures is presented. the system uses a hierarchical classifier based on exclusion principles and classifies an interactively optimized minimal set of basic features like local brightness, edge-structures and number discrimination. the system works very satisfactorily and is low-cost.
the conventional serial computer can only process one pixel of an image at a time, the linear array processor (LAP) utilises as many processors as there are pixels in one line of an image, and performs operations on t...
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ISBN:
(纸本)0903608960
the conventional serial computer can only process one pixel of an image at a time, the linear array processor (LAP) utilises as many processors as there are pixels in one line of an image, and performs operations on them in parallel. this paper will outline the functional blocks that compose the LAP, and show how they are used. A selection of application examples explain how the LAP is programmed using the picture processing language (PPL), and some parallel programming techniques are introduced.
this conference proceedings contains 47 papers. Among the areas covered are: sensor based manufacturing;vision systems;sensor guided welding;3-dimensional sensing;sensory control;non-vision sensing;knowledge-based sen...
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ISBN:
(纸本)0903608758
this conference proceedings contains 47 papers. Among the areas covered are: sensor based manufacturing;vision systems;sensor guided welding;3-dimensional sensing;sensory control;non-vision sensing;knowledge-based sensory systems;advanced vision techniques. the topics discussed include: vision driven picking;iconic imageprocessing;eddy current sensors;machine vision algorithms;object recognition;real time path control of a robot;tactile sensing arrays;magnetostrictive skin for robots.
Benchmark testing is essential if silhouette imageprocessing systems are to be evaluated and compared objectively, and advance in the state of the art demonstrated. the authors have devised a set comprising 40 shapes...
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ISBN:
(纸本)0903608758
Benchmark testing is essential if silhouette imageprocessing systems are to be evaluated and compared objectively, and advance in the state of the art demonstrated. the authors have devised a set comprising 40 shapes selected to probe for particular weaknesses, which are described and explained. the set tests accuracy in orientation and location, as well as ability to distinguish shapes which are very similar.
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