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介绍云计算的运用用例
云计算运用用例白皮书,Cloud_Computing_Use_Cases_Whitepaper-4_0-China_S.Chinese_translation
2010-10-27
Shape-Adaptive Discrete Wavelet Transforms for
Abstract—This paper presents a shape-adaptive wavelet<br>coding technique for coding arbitrarily shaped still texture. This<br>technique includes shape-adaptive discrete wavelet transforms<br>(SA-DWT’s) and extentions of zerotree entropy (ZTE) coding<br>and embedded zerotree wavelet (EZW) coding. Shape-adaptive<br>wavelet coding is needed for efficiently coding arbitrarily shaped<br>visual objects, which is essential for object-oriented multimedia<br>applications. The challenge is to achieve high coding efficiency<br>while satisfying the functionality of representing arbitrarily<br>shaped visual texture. One of the features of the SA-DWT’s is<br>that the number of coefficients after SA-DWT’s is identical to the<br>number of pixels in the original arbitrarily shaped visual object.<br>Another feature of the SA-DWT is that the spatial correlation,<br>locality properties of wavelet transforms, and self-similarity across<br>subbands are well preserved in the SA-DWT. Also, for a rectangular<br>region, the SA-DWT becomes identical to the conventional<br>wavelet transforms. For the same reason, the extentions of ZTE<br>and EZW to coding arbitrarily shaped visual objects carefully<br>treat “don’t care” nodes in the wavelet trees. Comparison of<br>shape-adaptive wavelet coding with other coding schemes for<br>arbitrarily shaped visual objects shows that shape-adaptive<br>wavelet coding always achieves better coding efficiency than<br>other schemes. One implementation of the shape-adaptive wavelet<br>coding technique has been included in the new multimedia coding<br>standard MPEG-4 for coding arbitrarily shaped still texture.<br>Software implementation is also available.
2008-03-08
排队论的PPT
排队论(Queuing theory)是具有特殊实用价值的现代应用数学的分支之一;是概率论、数理统计和随机过程论卓有成效地解决现实生活中形形色色实际问题的一面镜子;是运筹学中内容异常丰富的一个精华部分.
2007-12-10
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