Abstract: The Fourier describer only describes the boundary shape of the planner target region, and can not reflect feature inside characteristic .If the gray distribution of target region is known, one can make use of the gray distribution to describe the target characteristic and boundary shape and get to reflect the affine invariant feature inside characteristic, can reflect the origin characteristic more completely.

Key words: Region moment, Affine invariant feature, Affine transform

摘要： 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。若目标区域的灰度分布已知，可利用目标区域的灰度分布构造各阶矩来描述目标的灰度分布特性及边界形状，即用区域矩来表征目标，可以得到反映目标内在属性的一些仿射不变特征，更能全面地反映目标本原特征。

关键词: 区域矩, 仿射不变特征, 仿射变换