This paper introduced a method which used Laxity iteration method to iterative operation within the scope of complex number in order to gain root,then it used compare method to paint fractal picture with the calculated result,and confirmed the algorithm geometry significance in mathematics.Moreover,multifractal spectra of every sample picture was offered.The result demonstrated that the more times of using iteration function,the narrower the breadth of multifractal spectra was and more evenly the distribution of the picture was.
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