Abstract: An automated method for identifying the precise location of each sub-array and dot of a micro-array is provided. The sub-arrays of the micro-array are located using a template sub-array. The estimated location of each sub-array is estimated according to the expected physical dimension of the sub-array. A search of each sub-array is conducted for the dots of each sub-array. A constraining shape mask is constructed, and a segmentation method is applied to detect the location of each dot within the collection of pixels. The constraining shape mask is applied to each detected dot, limiting the boundary of and precisely identifying the location of each dot.

Abstract: A method for migrating seismic data is disclosed in which seismic traces recorded by a plurality of receivers are separated into offset bands according to the offsets of the traces. The data in each offset band is then migrated according to a downward continuation method. The downward continuation method includes the calculation of a constant that is not dependent on the value of the wave field. The constant is used to calculated the wave field for all offset bands for a given z level, thereby reducing time and computation resources consumed by the migration of the offset bands. Following the downward continuation, an imaging condition may be applied to produce a seismic image.