最新刊期
卷 3 ， 期 6 ， 1998
- 摘要：This papers proposes the development of a world wide web image search engine, which browses homepages on Internet, computes the features of images embedded in the pages, extracts the index information based on image content, stores the index vectors, and a nswers the users' queries of similar images. The paper also analyzes the technologies of query be image content such as color histograms, edge orientation histograms, texture measures and shape invariants. In the ending discussion the requirement of world wide web image search engine is predicted.2211|122|0更新时间：2024-05-08
- 摘要：This paper is concerned with an application of artificial neural network to the real-time detecting system which can inspect the inner walls of pipes. As a regular detector, the BP neural network is used for extracting features of the images inspected and classifying the images in the system, and an improved BP algorithm which was named for BP′is used for making the learning procedure of the net converge to the minimum of overall situation at great rate.关键词：neural network;classifier;Feature texture;BP algorithm,2422|142|0更新时间：2024-05-08
- 摘要：Image segmentation is the key step in object recognition and image understanding. Split-and-merge is an efficient and practical method to segment an image. The Split-and-merge method based on edge information is presented. The edge information is used both to adaptively determine the beginning layer which is optimum, and to measure the consistence of image blocks during merging and spliting. By using the method the segmentation quality is improved, the processing time is decreased, and the satisfied experiment result is obtained in segmentating some sophisticated images.关键词：Split-and-merge;Image segmentation;Quadtree;edge;Consistence2318|126|0更新时间：2024-05-08
- 摘要：Most of the fast block matching algorithms(BMAs) use the origin as the initial center of the search. To improve the accuracy of the fast BMAs, a new predicted search algorithm is proposed in this paper. Based on the spatial correlation of motion and the fast center-based BMAs, the four causal neighbour blocks are chosen to predict the start searching point and then the center-based BMA is used to find the final motion vector as the global minimum is more close to the predicted center. Experimental results show that the proposed predicted search algorithm overdrives the performance very well in most fast BMAs such as the new three-step search, the four-step search in terms of motion compensation errors. In addition, the average computational requirement is also reduced.关键词：Video coding;Block matching algorithm(BMA);Four-Step Search algorithm(4SS)2273|119|0更新时间：2024-05-08
- 摘要：In this paper, we proposed a very fast fractal image coding method, which is based on neighboring search for the matching of image blocks and testing of significant uncorrelation of blocks. For the standard test image(Lena 256×256×8ppb), comparing with the classification method, we recorded acceleration factors from 70 up to 200 with 2(dB) to 3(dB) deg radation of PSNR and some improvement of the compression ratio; comparing with the ordinary neighboring search method, we recorded a 32% acceleration factor without any degradation of PSNR, and if 0.2(dB) to 1(dB) degradation of PSNR are permitted, acceleration factors from 3 to 9 are recorded.1819|130|0更新时间：2024-05-08
- 摘要：In the process of motion estimation for very low bit rate video coding, a macroblock is partitioned adaptively with a pattern which matches the shape of edges of the objects in the macroblock, and two time differential reference frames are used. To speed up the process of motion estimation, the macroblocks which need not to be coded are distinguished before the process, and a fast search algorithm is used during the process. Simulation results demonstrate that, compared with the advanced prediction mode in H.263, the proposed method for motion compensation makes higher signal noise ratio (SNR) for the reconstructed image.1954|117|0更新时间：2024-05-08
- 摘要：A prediction model is proposed to predict the matching possiblity of the block in fractal image coding. We apply this model in fractal image coding to reduce the redundant matching calcaulation. Experimental results indicate that it can greatly increase the speed of fractal image coding by this way.关键词：Fractal image coding;Image coding;Fractal;iterated function system2510|140|0更新时间：2024-05-08
- 摘要：A new morphology method of 3-D objects Morphing is proposed and the principle of the method is proved. The relationship of morphing interpolation is described by a uniform mathematics model and the problem of two arbitrary polyhedrons morphing is solved. Experimental results show that the new method is good for morphing and the defect of old method is overcome. It's very easy to complete and the method can be popularized to modeling system.关键词：Morph;morphology;Animation2225|119|0更新时间：2024-05-08
- 摘要：In this paper, the relationships between 3D spatial models are investigated by vector analysis. A series of factors and formulas are defined for detecting if any collision happened among the models. Then, analgorithm is developed for collision detection, and was proved correct and effective with experiment.2280|120|0更新时间：2024-05-08
- 摘要：This paper discusses several ways of realizing Web GIS. Research work on Web GeoWindows, especially on multi-windows layout, DOS/Windows binary file data high byte/low byte reverse problem and its solving means is introduced in the paper, The author forecasts that Web GIS can be applied in socialized GIS and in simplifying OA.关键词：Internet;WWW;GIS;Java Applet2091|126|0更新时间：2024-05-08
- 摘要：Integrating Raster with Vector technology is one of the directions in recent GIS development. On the basis of practice, this paper introduces a GIS system which integrates Raster with Vector . It's design,data management,data matching and integrated analises are discussed. Some samples of application are also mentioned.关键词：GIS;Integrated raster with vector;Seamless connection;projection;Scale matching;Cordinate matching3046|176|0更新时间：2024-05-08
- 摘要：GIS of the Comprehensive National Situation for the State Council (9202 Project) is a multifeature, multilevel and multitense spatial information system. Based on the spatial data of National Fundamental Geographic Information System, it provides the leaders of different ranks in both central government and local government agencies with themacroscopical analysis and policy-making basis in fields of economical management and social development. In this paper, the following technical problems are discussed in detail: basic characteristics of government GIS, principles of software design, techniques of software devlopment, system functions and real application of 9202 Project. Besides, some suggestions for software devlopment are given.关键词：geographic information system;The state council;Software system1837|128|0更新时间：2024-05-08
- 摘要：Based on analysis of large area spatial data,a method of orgainization and management for large area seamless spatial data is presented in this paper.The proposed method supports topological data model and spatial area is splitted and stored by many sheets.The experimental results have proven that the proposed method is efficient .关键词：Large seamless spatial data;Relational index;Positional index2520|116|0更新时间：2024-05-08
- 摘要：This paper presents a Video Print System based on FPGA. Using the print method of apart-layers, we have accomplished Full-Tone Rendition print with high-performance thermal heads. The Acquisition and Processing Logic(APL) was implemented using a FPGA device. Compared with a previously design using 7 400-series and 4 000-series chips, this one has better characteristics. The devices operate fast and the system provides high-performance. FPGA technology improves flexibility and reliability of the design.1994|138|0更新时间：2024-05-08
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