According to the fusion levels, there are data level, feature level, decision level included in data fusion.
从融合的层次结构出发，数据融合技术可分为数据级、特征级和决策级三个融合层次。
The definition, fundamental, fusion levels, process model, fusion methods of data fusion are summarized firstly.
首先对数据融合的定义、基本原理、融合层次、功能模型、融合方法等几个方面进行了综述。
The patients were matched according to age at surgery, operative method, curve location, number of fusion levels, and degree of curves.
病人根据手术时年龄，手术方法，侧弯定位，融合阶段的数目，侧弯角度配对。
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