不变矩的几何变换不变性特点，使其在模式识别、计算机视觉和图像重构中被广泛使用。

For geometric invariance of the invariant moment, it has been used in pattern recognition, computer vision and image reconstruction.

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分析了舰船目标的几何特征和不变特征，为满足实时性要求，使用一组统一的相对矩来计算特征量。

Geometry character and invariant character of ship target is analyzed and a united relative invariant moment is used to calculate the feature to meet real-time requirements.

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