Patent ID: 8412470

Claim:
A method for mapping changes in a structure, the method comprising: collecting a plurality of responses from a set of transmitter and sensor pairs for the structure, the plurality of responses comprising responses to signals in a waveform with a frequency range selected to map the changes in the structure; identifying on a computer change metrics for pixels in a plurality of grids from the plurality of responses, wherein a first grid in the plurality of grids is shifted in relation to a second grid in the plurality of grids, the identifying comprising: finding a length of a path passing through a pixel in an unprocessed grid; obtaining a solution for a change metric in a set of pixels to estimate a set of change metrics for the unprocessed grid; and repeating the finding and obtaining steps until the plurality of grids have been processed to obtain a plurality of sets of change metrics that are combined to form a final change metrics map for the structure; and generating on the computer a map for the structure using the change metrics.