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在分形块编码中，值域块与定义块池中的定义域块逐一匹配过程极其费时，为了大大地缩短分形编码的时间，将定义域块和值域块的匹配限制在以值域块的均值和方差作为中心的动态窗口中．动态窗口的长和宽，根据定义域块均值和方差的二维直方图自适应确定．与全局匹配分形块编码相比，大大地缩短了编码时间．
In fractal block coding, the process of matching the range block and the definition block in the definition block pool is extremely time-consuming. In order to shorten the time of fractal coding greatly, the matching between the domain block and the range block is limited to the range block Mean and variance as the center of the dynamic window. The length and width of the dynamic window are adaptively determined according to the two-dimensional histogram of the block mean and variance of the domain. Compared with the global matching fractal block coding, the coding time is greatly shortened.