4[4]American Association of State Highway and Transportation Officials.AASHTO Guide for Design of Pavement Structures[M].USA:American Association of State Highway and Transportation Officials,1993.
5[5]Siriphan Jitprasithsiri.Development of a new digital pavement image processing algorithm for unified crack index computation[A].A Dissertation Submitted to the University of Utah[C].Utah:Utah University,1997.