针对心电波形，本文提出了一种基于层次结构的特征抽取和描述方法。
For the electrocardiogram wave form, based on the hierarchical structure, this paper presents a characteristic sample and description method.
讨论空间曲面的表达和描述方法，给出了利用不变矩描述空间曲面的方法。
The expression and description of space surface is demonstrated. Invariant moments are used to describe the surface.
讨论空间曲线的表达和描述方法，提出用矩和傅里叶描述符描述空间曲线的方法。
The expression and description methods of space curve are demonstrated. The methods of using moment, Fourier to describe the space curve is proposed.
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