最新刊期
卷 4 ， 期 1 ， 1999
- 摘要：This Paper gives the author’s view about some key issues of the development of GIS in china including data,standard and software,Through this discussion with collegues in chinese Geomatics we hope to promote the development of Geomatics in china correctly and rapidly.关键词：Data;Standard;Software;GIS2225|199|0更新时间：2024-05-08
- 摘要：In this paper, we proposed a fractal characters based method for nature environment image segmentation. The main goal of the segmentation is to find the artifact object from the image. Based on several kinds of fractal characters, we can acquire the description of roughness of each part of the image. Then we can get the segmentation of the image. We also analysis the performance of the data fitting in the box dimension estimation, and present an optimizedmethod. According to a lot of experiments, the proposed approach is proved to be suitable for texture segmentation and artifact object finding in natural environment images.2464|147|0更新时间：2024-05-08
- 摘要：The general way to technically implement the GIS data sharing in early days was the adoption of geographic encoding based on some classifications. The reason for this is the perception that the codes used to represent the geography is unique. But the practices in recent years have proved that the method above is of little use in data sharing. This article has given a GIS Semantic Data Model to try to solve the problem of data sharing. A theoretical frame as well as the strict definition of related concepts have been given in this paper. An application related to the design of NREDIS has been introduced to verify the applicability of the proposed model. Some further work has been listed in the last paragraph.关键词：Semantic data model;Geographic entity;Geographic feature;Conceptual schema2441|240|0更新时间：2024-05-08
- 摘要：Image matching is the key step of realizing the stereo vision, and the relaxation operating is a powerful way. In some situation, the traditional relaxation operating converges slowly because the process is an iterative procedure. In this paper, authors present an adaptive approach toward relaxation operating and give out the method of determining the correlative coefficient. Finally, the efficiency of algorithm is examined through a practical experiment.2220|146|0更新时间：2024-05-08
- 摘要：After discussing the second level low frequencies part of wavelet transform, which is rather difficult to be compressed, we can use the nonlinear mapping capacity of multi layer free forword neural network on BP algorithm. A scheme of image coding based on nonlinear predictor is put forward. Redundance among the wavelet coefficients can be ridded effectively with the help of this method. On the condition of relatively low distortion degree , the rather satisfactory compress rate can be achieved.2147|126|0更新时间：2024-05-08
- 摘要：The ray tracing algorithm is adopted to complete the realistic graphical generation for a NC turning machining center and it’s processing simulation is realized in off line. In the simulation, on the basis of characteristics in NC processing,the Torrance-Sparrow’s illumination model is simplified and the complicated Boolean operation is avoided using the feature model technology. Since the main task in the ray tracing is to calculate intersection points,a new method is designed based on a convex polyhedron constraint condition and the Cyrus-Beck’s algorithm for line clipping. The method is not only efficient, but it can lead to the test and the intersection calculation between a ray and an arbitrary convex polyhedron. In the end, the possibility to generate an real time fidelity scenario based on ray tracing method is discussed.2285|152|0更新时间：2024-05-08
- 摘要：Content-Based image retrieval (CBIR),which is the mixture of image understanding and multimedia, is becoming a key technique in next generation large scale intelligent multimedia database. In this paper, we present three algorithms to support color histogram based on retrieval in logo image database. The first two algorithms are used to reduce the complexity in Swain’s algorithm,and the thired one is used to make binary tree structure for quick retrieval.2688|151|0更新时间：2024-05-08
- 摘要：Based on the idea of detecting multiscale edge by Mallat, multiscale edge detection with continous wavelet transform is done. During the calculation of continous wavelet transform, Fourier transform is used.The method of weighted average is given to calculate the modulus on every direction.At last a example is given.2244|151|0更新时间：2024-05-08
- 摘要：Firstly, we have briefly introduced the degenerate models and the restore methods of in image processing. Secondly, we have given two image radiation correction methods. We have proposed an effectively and directly image radiation correcton method in whic关键词：Radiation correction;Degenerate model;Local maximum entropy2333|136|0更新时间：2024-05-08
- 摘要：A quick fractal block coding based on multiscale matching is presented in this paper.It provides a new approach for reducing search time.Compared with the full search method,our algorithm speeds up the coding procedure by 10 up to 40 times.关键词：Fractal block coding;Fractal approximation;Multiscale matching;Range block;Domain block2014|145|0更新时间：2024-05-08
- 摘要：This paper describes the theory and characteristics of 3D DCT technigue for real time video compression. 3D DCT technigue is a symmetric method used in video coding and decoding. As compared with the hybrid coding in existent internatonal standards (e.g.H.261, MPEG, etc.) , it has lower complexity, higher compression rate and better reconstructed image quality. Therefore the 3D DCTtechnique would have a very good spectacle in the area of real time coding.关键词：Picture communication;video compression;XYZ technique;3D DCT3497|151|0更新时间：2024-05-08
- 摘要：This paper presents a new compression coding method based on information fusion for industrial video image, and a study is made on how to compress industrial video image using this method based on information fusion.Using the coding method, the compressed bitrate has decreased to 1～2Kbps.关键词：Data compression;information fusion;Image communication;signal processing2003|159|0更新时间：2024-05-08
- 摘要：On the basis of the statistical characterestics of satellite meteorological infrared cloud-charts this paper presents a coding algorithm of“Sub-sampling+Modified JPEG+Image enlarging”,realizing a compression ratio of 50∶1～100∶1, with the PSNR of 35～40dB and visually unperceptible distortion. For error-free data compression of satellite cloud-charts, training set is selected to seek the minimum mean-square-error preditor,which is used as the fixed predictor and applied to the compression of any cloud-chart image, with a better performance than any other fixed predictors reported so far.2500|163|0更新时间：2024-05-08
- 摘要：In this paper, we summarily introduce the design of RGB Game Builder, a tool for developing real time 3D graphics application, such as the scene of simulation and training, 3D game, VR game etc. We have explained the framework of application, the structure of 3D database , the real time engine and the main graphics technique that we have used.2711|134|0更新时间：2024-05-08
- 摘要：Embedded microprocessor core is an important part of multimedia chip. In this paper, the design strategies for multimedia RISC core are expounded. MRI, a novel RISC core which is suitable for multimedia applications, is then presented with these strategies. MRI can be widely used in many multimedia areas such as image communication, audio encoding and video on demand service. The prototype implementation has verified its logic validity.2655|152|0更新时间：2024-05-08
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