最新刊期
卷 4 ， 期 4 ， 1999
- 摘要：In this paper, we propose a stratification transformation on the intensity surface of grayscale image. This transformation is confined by the original watershed partition, and after this transformation, there exists a strict causality between gradient watershed under different scales of geodesic reconstruction. In this way, the scale space of gradient watershed can be established. Some possible applications of watershed transformation on image sequence analysis are discussed, and by the utilization of the multiscale framework of gradient watershed, the efficiency and stability can be greatly improved.2392|124|0更新时间：2024-05-08
- 摘要：Lighting simulation and image synthesis for outdoor scenes is intractable due to the geometric and lighting complexity of such environment. In this paper we present an efficient solution to the problem of image synthesis by linear combination of acquired basis images. According as to the linearity of illumination function, the coefficients of basis images of varying sun position and sky conditions can be calculated to generate the desired image. Our method has been proved suitable for fixed scene and camera geometry.2354|146|0更新时间：2024-05-08
- 摘要：DPCM is a lossless compression method used widely. A novel D 2PCM compression technique has been developed in this paper for more effective lossless compression of DSA (Digital Subtraction Angiography) image sequence, in which the correlation between subtraction images remains meaningful. By applying the lossless DPCM coder to the subtraction image, it constitutes a two order differential coding scheme in spatial and temporal space . This proposed method is able to sufficiently reduce the temporal spatial correlation. The high lossless compression ratio achieved by this technique will favor the transmission speed and storage space. The results in real applications prove it practicable and robust.关键词：DPCM;D 2PCM;DSA;Image sequence;Lossless compression2318|135|0更新时间：2024-05-08
- 摘要：The speed of volume rendering is the bottleneck of interactive visualization. In the paper, an original fast rendering system using image based rendering is presented, which greatly improves the speed of interactive visualization by combining the image based rendering and previous volume rendering. At first, a list of sample images is generated by ray tracing. Next these images are compressed by warping transformation. At last, random new view images can be rendered in speed of faster than 50 frames per second. In order to improve the speed more, a fast warping formula is developed关键词：Image based rendering;Warping transformation;Image Compression;reprojection2373|110|0更新时间：2024-05-08
- 摘要：A new method is presented for recovering the 3 dimensional structure of complex objects. Stereo is an effective method to determine the precise depth of the surface through binocular disparity. But it is difficult to establish the correspondence of the two image. The method of Shape From Shading (SFS) can learn the surface shape but not the surface depth of an object from merely one image under the constraint of surface smoothness; In this paper, the methods of stereo and SFS are integrated into neural networks to locate the precise depth and shape information of the object, which gives full play to their superiority. Experimental results with numerically generated and laboratory images are given to verify the method.关键词：stereo;neural network;Depth recovering2456|139|0更新时间：2024-05-08
- 摘要：A model of oriented object, data-driven Science Visualization Environment (SVE) is provided basis on science visualization technology which is a international academic research hotspot at present, The structure, feature, run mechanism and realization key technology of SVE are introduced detailly, The prototype and run result of the prototype are given finally.2272|127|0更新时间：2024-05-08
- 摘要：Based on the analysis and research of the structure of lattice, this paper in detail discusses some important algorithms about lattice and gives lattice vector quantization algorithms of image objects in wavelet domain. In order to realize efficiently scalar quantization of some wavelet coefficients, this paper presents a successive approximation algorithm applying the distribution of the wavelet coefficients. At the same time it uses lattice vector quantization for some wavelet coefficients. It shows by examples that lattice vector quantization not only accelerates the quantization but also raises the compression efficiency, which satisfies the image compression's needs for multimedia communications.2696|131|0更新时间：2024-05-08
- 摘要：This paper discusses the method for counting the union, intersection and trim of closed contours. The“reason”for bringing up the question is introduced. The theory and implementation of the algorithm are described detailedly. The algorithm is simple which combines the three counting operations in one. And the differences among the three counting operations are given.2614|153|0更新时间：2024-05-08
- 摘要：In this paper, the four-interpolatory scheme is applied in simulating topography. In order to control the form of topography, the proper“control-parameters”are chosen. For the sake of getting variant ones, geometric texture-rendering methods are applied. In the mean- time, patches are really displayed in GL environment bymodifyingthe property of the material, the light and the lightmodel. The experimental results showthat the algorithm offers an efficientmeans for simulation of natural scene which effected by the surrounding, the trees, the climate and so on.关键词：Topography simulation;Tour interpolatory scheme;Shape parameters;Really display2409|127|0更新时间：2024-05-08
- 摘要：Fractal Image Compression is a valid algorithm. On the foundation of recent research about Fractal Block Coding, this paper completes both the encoding and decoding processes. Furthermore, by analyzing the relation between stored data, the authors first catalog different data according to different rules, then respectively apply Arithmetic Coding on them. The analysises and results show a better compression ratio on the basis of a fixed PSNR.2225|117|0更新时间：2024-05-08
- 摘要：In this paper, we propose a novel method to recover the 3D shape of objects from two image sequences. At first, for eliminating the limitations of the conventional shape from shading methods, we develop a spherical light source model. Based on this model, a fast genetic algorithm is then used for the shape and reflectance recovery from the diffuse reflection component extracted from a pair of image sequences. An image sequence is acquired with each image taken at a different light position. As a result, the normal of a surface patch which is not in the light source moving plane can also be estimated robustly. Our method is verified by both real and simulated experiments.2964|196|0更新时间：2024-05-08
- 摘要：This paper deals with markov random field and it's application in image texture classification.We concerned with three problem:choice of an appropriate model from a class of such competing models;estimation of the unknown paraneters in markov random field models and using parameters to classify images.For the first problem,we use bayes decision rule;for the second problem,we use maximum likelihood estimation methods;for the third problem,we use fuzzy assemble analysis. At last,we did some tests.2745|148|0更新时间：2024-05-08
- 摘要：A new fast MPEG video scene cut detection algorithm is proposed in this paper. The similarity of a frame to it's predictive frames was calculated based on corresponding motion vector in it's MPEG stream and was further normalized. Then, a scene cut can be detected according to the normalized similarity. Test results have shown that this method greatly increased the speed and accuracy of MPEG video scene cut detection.2514|136|0更新时间：2024-05-08
- 摘要：On the basis of discussing the basic principles of Genetic Algorithms, this paper takes the method of maximum classes square error as an example to discuss how to apply Genetic Algorithms in the automatic selection of image thresholds, and describes the detail procedure. The results of experiments show that Genetic Algorithms can improve greatly the performance of old methods selecting image thresholds.2799|137|0更新时间：2024-05-08
- 摘要：Based on the characters of spatial relation computation of Network Oriented WebGIS, the authors made a systematic study on spatial relation computation to meet the demand of distributed spatial analysis. The computation complexity and data abstract probability were used to consider the distributed schema of spatial relation computation, and a respective schema and spatial analysis web based transportation protocol were proposed and implemented in WebGIS.关键词：Spatial object;spatial analysis;distributed computation;WebGIS;Transportation protocol3701|182|0更新时间：2024-05-08
- 摘要：A new method of fractal rendering is presented in this paper,which uses control matrix to control the iteration of botanical growing.The efficiency of the method is good in simulation of grass and trees.2750|136|0更新时间：2024-05-08
- 摘要：In this paper,we analyze some general features of the nonlinear dynamic activities of the Coupled Logistic Map.We find that,for the difference of the selected values of the three control parameters,chaotic patterns of the Coupled Logistic Map may emerge out of Feigenbaum route ,the Ruelle Takens Newhouse Scenario and Pomeau Manneville route respectively.However,there exist large regions of control parameter space where the approaches to chaos have something to do with Hope bifurcation and we can observe phase locking and quasiperiodic motion on these routes.At the same time, the researches on the fractal images of the Coupled Logistic Map make it clear that when the control parameters are different,the fractal images are different from each other and these fractal images exhibit the fractal property of self similarity.3105|165|0更新时间：2024-05-08
- 摘要：The Dichromatic Reflection Model describes the color of the reflected light as a mixture of light from surface reflection and body reflection. In this paper, an effective method using image processing for analyzing moisture of tongue fur based on the Dichromatic Reflection Model is introduced. The formation of the highlight areas and the influence of the characters of CCD camera to the formatted color image are studied here. The presented method gives a good result to the highlight areas detection and recognition. And the application of this method to analyse moisture of tongue fur is discussed.关键词：Image processing;Moisture analysis of tongue fur;Dichromatic Reflection Model;Highlight area2317|130|0更新时间：2024-05-08
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