根据ISO标准，平顶激光束可以通过其平坦度（F）、边缘陡度（S）、光束均匀度（U）和平台均匀度（Up）来量化。
Following the ISO standards, Flat-Top beams can be quantified by their flatness (F), edge-steepness (S), beam-uniformity (U) and plateau-uniformity (Up).
包含的函数：（每个函数文件都有附加注释）
Included functions: ( Each function file has additional comments)
F = Flatness(I);
S = EdgeSteepness(I);
U = BeamUniformity(I);
Up = PlateauUniformity(I);
d = fwhm(I)
注意！！输入“I”必须是包含每个位置I(x)处光束强度的1D数组
(NOTE!! The input “I” must be a 1D array containing the intensity of the beam at each position I(x))
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