Concepts of Primary Feature Field and Primary Feature Space are defined, and factor of Primary Feature Word is introduced to the traditional weighting schema to enhance the system performance.
文中提出主特征域和主特征空间的概念，在传统词的权重计算中引入主特征词信息因子，改进检索效果。
Feature space imitates the model of biological complex neurons in primary visual cortex, and it is constructed through orientation histogram in feature's local area.
特征空间则模仿了灵长类动物的视觉神经元模型，以区域图像梯度直方图的方式建立。
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