一个zernike矩的程序，问相关问题
%_____OUTPUTS____________________________________________________________
%A_nmZernike moments(row vector)
%zmlistkeeps order and repetition information(Mx2 matrix)
%M = total # of moments
%cidx1-D indices of retained unit circle region(vector)
%V_nmZernike polynomials size of img(col vectors)
%to save memory, exclude this output term
%
%_____INPUTS_____________________________________________________________
%imgrow by col image of reals(matrix)
%norder(vector)
%starting from 0
%mrepetition(integer)
%
%_____NOTES______________________________________________________________
%- for demo, call function without parameters
%
%zernike(img)
%computes moment of order 0 repetition 0
%zernike(img,n)
%computes all moments of order specified in VECTOR n
%zernike(img,n,m)
%computes moment of VECTOR order n repetition m
%- |m|<=n and n-|m| even
%- img MUST first be normalized w.r.t. scale and translation
%i.e. centroid of image is at image center, and image
%has geometrical moment m00 = fixed number/scale
%- x,y follows raster scanning convention
%- rotation invariant in the magnitude, i.e. |A_nm|
%- to start from a particular order, specify a range in n, e.g. [4 5 6]
%- n=0 is useless for centered data as it is simply the center of mass


是英文的注释，不太明白，想请各位大牛帮帮忙，帮助理解一下输入部分、输出部分的解释
例如，输入格式为zernike(img,12,3) 是不是计算图像img的12阶zernike矩？如果是，理论上zernike的12阶矩应该有7个矩特征，为什么程序只有1个复数结果输出？
是我毕业设计的内容，急切等待大家帮忙


[解决办法]
这个不是很明显么。
输出的是12阶的第三个值。
泽尔尼克矩阵输出结果本身就是复数。