Methods for determining whether to perform a stimulation treatment on a subterranean zone are disclosed. Specifically, images or frames in a video sequence are represented as collections of flat moving objects that change their appearance and shape over time, and can occlude each other over time. The echoes are combined by different nonlinear signal separation processes and these results are combined to reduce image speckle by a frequency compounding effect. Once a connection has been established, UPDATE and CONFIRM messages are used by Access Service Network Gateways to exchange WiMAX R4 routing information.