1. A method for processing seismic data corresponding to a subsurface, the method comprising: receiving seismic image data corresponding to a plurality of locations (x); receiving a velocity model (c(x)) for the plurality of locations (x); scaling with a computing device a time-shift dimension (τ) associated with the seismic image data according to the velocity model (c(x)) to provide velocity normalized seismic data; and generating a final image (S(x)) of the subsurface using the velocity normalized seismic data, wherein the step of scaling converts the time-shift dimension (τ) to a propagation distance offset (ξ) based on the velocity model (c(x)).