参数曲线的保形性与生成它的基函数的规范化全正性有关。
Shape preservation of parametric curves is associated with normalized total positivity of its basis functions.
目前，分形图像编码以其解码快速及分辨率无关等特性正逐步显现出它的优越性。
Nowadays, fractal image compression has received much appreciation because of its characteristic of fast decoding and resolution-independent.
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