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[Other] DOC的快速变换 DL : 0: 考虑到DCT变换中的系数要重复计算，可使用查找表来提高运行的效率，只要开始DCT变换之前计算一次，DCT变换中就可以只查找而无需计算系数。-to the DCT coefficients to be calculated, the use of look-up tables to improve operational efficiency, as long as the DCT started once before, on DCT can only search without calculation of the coefficient.
Date : 2008-10-13 Size : 3.91kb User : 佘某
[Other] li_0101 DL : 0: /*DCT和IDCT快速变换的C语言实现仿效FFT的FDCT方法有与DCT无关的复数运算部分，选用代数分解法可以降低运算量，达到高速运算的目的。代数分解法实现如下：对一维DCT表达式直接展开，寻找各点表达式中共同项，仿FFT蝶形关系，将表达式中的共同项作为下一级节点，依次进行多次，最后得到变换结果。*/-/ * DCT and IDCT rapid transformation of C language FFT follow the diagram method with DC T unrelated to the complex computing, use algebraic decomposition method can reduce the amount of computation and high-speed computing to achieve the purpose. Algebra factorization method is as follows : one-dimensional DCT direct expression start to find points of common expression, imitation FFT butterfly, expression of the common items as under a node, followed by a number, finally transform results. * /
Date : 2008-10-13 Size : 5.02kb User : 李建红
[Other] VC-DCT DL : 0: DCT离散余弦快速变换，可用于图象处理及音频信号处理-fast DCT discrete cosine transform, can be used for image processing and audio signal processing
Date : 2008-10-13 Size : 134.49kb User : 刘铭
[Other] matlab DL : 0: 主要通过matlab实现了数字水印方面的功能，比如，dct dwt
Date : 2008-10-13 Size : 7.39kb User : 啊柄