Abstract:Multiscale boundary detection is equivalent to searching out the local extremum of wavelet transform modulo of image. In scale space,the local extremum of wavelet transform modulo of image not only describes the local characteristics of irregular structure of image but also displays distribution of local singular points. Using above theory,one may take local extremum of wavelet transform modulo to detect both event location and characteristic fault point location of 2-D reflection seismogram. In other words,one can estimate local Lipschitz exponent and smoothing factor,automatically trace seismic events and determine fault points along the scale stretch direction of wavelet transform modulo.