为了实现目标伪装效果评价的客观化和定量化，基于表征人眼视觉注意机制的特征描述子建立了特征相似度模型. 人眼视觉注意机制模型量化了视觉注意焦点的转移过程. 基于特征尺度值，提取了注意焦点的特征描述子. 建立了基于特征描述子的特征相似度模型，实现了目标与背景在亮度、颜色和空间分布等方面融合程度的定量评价. 拟合了特征相似度与目标发现概率的关系式. 实际应用结果表明，该模型具有可操作性强、量化准确等优点.

 In order to evaluate effectiveness of target camouflage objectively and quantitatively, a model of similarity degree is established based on a descriptor of attention focus derived from the human visual attention mechanism (HVAM). Locations and shifts of the attention focus are searched and measured using the HVAM model. The descriptors of attention focus are extracted based on their characteristic scale levels. The model of characteristic similarity degree is constructed on the descriptor, which can quantitatively evaluate the degree of amalgamation of target and surrounding background in brightness, color and space distribution. The relation between characteristic similarity degree and target detection probability is given. Applications show that this model has advantages such as high determinability and operability.