形状特征是对图像中边界清晰的目标的最好表达方式。
Shape feature is the most suitable tool in characterizing image content object which has clear object outline.
本文用球函数展开散射场，结合刚性边界条件导出了刚性目标的重构公式，并利用该公式重构了刚性球和椭球的形状。
By spherical function expansion of the scattered sound field in conjunction with rigid boundary conditions, formulas for reconstructing the shapes of rigid scattering objects are derived.
平面目标闭合曲线的傅里叶描述子只描述了目标区域的边界形状，无法反映目标内在属性。
The Fourier describer only describes the boundary shape of the planner target region, and can not reflect feature inside characteristic.
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