关键词: 路面破损, 分数布朗运动, 多尺度, 弱信息

Abstract: Automated detection and recognition of highway crack is the key to road surface crack information system.The result of crack detection will directly affect the evaluation of road damage.Based on Brawn motion model，this paper presents a multi-scale of fractal Brown motion character vector to describe image block and a k-means clustering and voting mechanism are used in produce the final result.The experimental comparisons with classic operator method（canny operator） and single-scale fractal Brown motion show that this method is more efficiency，more exactness and closer to original crack position in detecting road crack weak information.Furthermore，the method takes on very high practice value.

Key words: road crack, fractal Brown motion, multi-scale, weak information