关键词: 分形特征, 模糊集, 目标检测, 模糊增强

Abstract: Detecting target under complex background through single fractal feature would bring errors because of non-universality and fuzziness of fractal feature between target and background.A novel algorithm of fractal feature enhancement based on fuzzy sets is proposed in this paper.First，the fractal feature according to fractal scale invariance is estimated.Then，the new membership function of fuzzy is defined to map the fractal gray image into fuzzy feature plane.Finally，the fractal difference between target and background is increased by fuzzy enhancement transformation.On this basis，combing with mathematical morphology，the target detection method based on the enhanced fractal feature is given.The experimental results indicate this fuzzy enhancement algorithm can enhance the fractal feature of target and background effectively，and that the disadvantages of traditional fuzzy enhancement methods are avoided.Through detection method based on enhanced fractal feature，the target can be detected in complex background correctly and reliably，and the capability of restraining noise is good in detection.

Key words: fractal feature, fuzzy sets, target detection, fuzzy enhancement