最新刊期
卷 2 ， 期 12 ， 1997
- 摘要：By extending the concept congruence from integer to real number field, this paper defines a concept named ‘part’ of real number. A real number can be represented as an infinite sequence, a finite sequence of it is called 'part'. If two real numbers have the same part, then they are called isopart. By Studying the part of a real value function, we have the conclusion as following: the set which includes all the isopart points is normally a binary fractals, The image of the new function generated by taking the part of the given function is multi-value fractals. The infinity of real number leads to the complexity of this kind of fractals, and the given function leads to the regularity. The method does not need iterative operations which are essential for traditional fractal generation methods. In addition, it makes the connection between numbers and fractals.关键词：Fractals;Numbe;Part;Isopart2348|167|0更新时间：2024-05-08
- 摘要：A new method of image processing is developed for measuring the dist ribution of mass、velocity and kinetic energy of the jet. As a sample ajet of oil punching bomb is given, the "Velocity- Mass(Percentage)”of this jetis given and conformes with the result of numerical simulation.关键词：fractal;Fractal image synthesis;wavelet;FBM image2186|142|0更新时间：2024-05-08
- 摘要：This paper gives new definitions of line and average chain code, out lines the relation of average chain code and straight line chain code, and proposes the mechanism of line detecting and line contour tracking method. Based on this method, we successfully extract straight lines and smoothly bend lines and separate text from image while tracking. This method can greatly improve the quality of vectorization and have a higher processing speed. It also can be used to detect and extract lines in other fields.2872|131|0更新时间：2024-05-08
- 摘要：Given a text of size n×n and a pattern of size m×m, the exact-matching is to find all occurrence of the pattern in the text, while the approximate-matching is to find all the location of m×m blocks in the text that differ by at most k mismatches. We present a new approach for exact-matching, which runs in O( n 2lo g?Σ?) , Σ = { a1 , a2 , ?, a?Σ?} is the alphabet of the pattern, and for approximate-matching, inO( n2lo g?Σ?) + hm2) , which consists of two stages. The first stage is to preselect h subblocks of size s×s ( 0≤s≤m) that exactly match the pattern. And the second stage of verification compares the blocks containing these h subblocks to determine if the mismatches is no more than k.3052|224|0更新时间：2024-05-08
- 摘要：Classified Block Coding has received more attention recently for the advantage of easy implementation. The classification and coding of blocks are the two important problems in classified block coding. In this paper, we propose a classified block coding algorithm based on DCT coding and polynomial approximation. In the algorithm, the original image is splitted into non-overlapped 8×8 blocks. The blocks are classified into four classes: constant blocks, smooth blocks, coarse blocks and detail blocks, by using the intensity local variance, the polynomial approximation error and spatial-frequency distribution. The constant blocks and smooth blocks areapproximated by 0-order and 1-order polynomial respectively. For the coarse and detail blocks, we compute and quantize their DCT coefficients. Then encode them by means of an improved run-length coding. The experiment results show that the proposed algorithm, without using entropy coder as postprocessor of the codes, has better performance than JPEG.关键词：Classified block coding;DCT;Polynomial approximation;Local variance2432|139|0更新时间：2024-05-08
- 摘要：Today, more and more printed documents use non-Manhat tanformat. The traditional auto zoning methods don't adapt to the format properly. A new autozoning method based on boundary code is presented in this paper and implemented for document image of non-Manhat tanformat.关键词：Document image;Autozoning;Manhattan format2218|180|0更新时间：2024-05-08
- 摘要：A fast VQ image coding method based on humans visual attribution and applying wavelet tree structure is proposed in this paper, naming tree structure fast VQ coding. After the characteristics of VQ was analyzed, a statistic method generating a codebook was designed, and a fast VQ coding method was represented. This method can efficiently remove correlation in image data, obtaining a low transmission bit stream. The apparent advantage of the method is to estab lish statistics codebooks for various image data, and each treating need not generate codebook s with a high coding efficient achieved, while it can apply to any opportunity with wavelet transformation used in various image and signal data compression. The experimental results show: The fast VQ coding method proposed in this paper can achieve a compression ratio of 40 with a PSNR of 36.21dB,while its total performance is superior to other methods, and a real time compression using this method may be implemented.2750|175|0更新时间：2024-05-08
- 摘要：A new method of image processing is developed for measuring the distribution of mass、velocity and kinetic energy of the jet. As a sample ajet of oil punching bomb is given, the "Velocity- Mass(Percentage)”of this jet is given and conformes with the result of numerical simulation.关键词：Jet;Flash X-Ray photography;Image processing2561|142|0更新时间：2024-05-08
- 摘要：A fast VQ image coding method based on humans visual attribution and applying wavelet tree-structure is proposed in this paper, naming tree-structure fast VQ coding. After the characteristics of VQ was analyzed, a statistic method generating a codebook was designed, and a fast VQ coding method was represented. This method can efficiently remove correlation in image data, obtaining a low transmission bit stream. The apparent advantage of the method is to establish statistics codebooks for various image data, and each treating need not generate codebooks with a high coding efficient achieved, while it can apply to any opportunity with wavelet transformation used in various image and signal data compression. The experimental results show: The fast VQ coding method proposed in this paper can achieve a compression ratio of 40 with a PSNR of 36.21dB, while its total performance is superior to other methods, and a real-time compression using this method may be implemented.2597|143|0更新时间：2024-05-08
- 摘要：Bronze mirrors have very important research values on archaeology, and the similarity evaluation of bronze mirror images is the key to solving the problems in manual classification and realizing the large scale quantitative analysis of bronze mirror images. This paper discussed the feasibility of KL expansion for similarity evaluation of mirror images, specified the normalization of mirror images and the procedure of eigen space construction through KL expansion, and proposed 3 similarity evaluation standards based on the " class" conception. Experimental comparisons and analyses of these evaluation standards show that, the 3 proposed evaluation standards based on the "class" conception are more effective than the conventional distance standard, and their evaluation accuracy reached higher than 85% under eigen space of higher dimension.2696|155|0更新时间：2024-05-08
- 摘要：This paper is the literature bibliography on computer graphics in China in 1996. Based on the current status of the research on graphics engineering as well as the dist ribution of related publications in China, we selected about 250 references from 11 important Chinese journals published in 1996 and classified these references into different categories according to their contents。We hope that the paper could provide readers with a general and up-to-date overview of graphics engineering in China.2751|161|0更新时间：2024-05-08
- 摘要：This paper is the literature bibliography on computer graphics in China in 1996. Based on the current status of the research on graphics engineering as well as the distribution of related publications in China, we selected about 250 references from 11 important Chinese journals published in 1996 and classified these references into different categories according to their contents。We hope that the paper could provide readers with a general and up-to-date ov erview of graphics engineering in China.2932|171|0更新时间：2024-05-08
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