A computer implemented method to process a three dimensional seismic image, the seismic image comprising points, each point comprising an associated seismic value, wherein the method comprises: /a/ receiving the three dimensional seismic image; /b/ receiving a predetermined distance; wherein, for a center point in the points of the seismic image and for a plane comprising said center point, said plane defining a first connected set of points, and a second connected set of points, wherein the points of the first connected set of points are points of the seismic image having a distance to the center point below the predetermined distance, the points of the first connected set being on a first side of the plane; wherein the points of the second connected set of points are points of the seismic image having a distance to the center point below the predetermined distance, the points of the second connected set being on a second side of the plane distinct from the first side; characterized in that the method further comprises: /c/ determining a first maximal correlation between: - a first vector of the seismic values associated with at least a point of the seismic image, said at least one point having a distance to the center point below the predetermined distance and said at least one point being on a first line, said plane comprising said first line, said seismic values being associated with said first line, and - a second vector of the seismic values associated with points of the first connected set of points and said points being on a second line parallel to the first line, the second vector being shifted by a plurality of shifting distances; /d/ determining a second maximal correlation between: - the first vector, and - a third vector of the seismic values associated with points of the second connected set of points and said points being on a third line parallel to the first line, the third vector being shifted by a plurality of shifting distances; /e/ determining a difference value based on at least a difference between the first maximal correlation and the second maximal correlation. /a/ receiving the three dimensional seismic image; /b/ receiving a predetermined distance; wherein, for a center point in the points of the seismic image and for a plane comprising said center point, said plane defining a first connected set of points, and a second connected set of points, wherein the points of the first connected set of points are points of the seismic image having a distance to the center point below the predetermined distance, the points of the first connected set being on a first side of the plane; wherein the points of the second connected set of points are points of the seismic image having a distance to the center point below the predetermined distance, the points of the second connected set being on a second side of the plane distinct from the first side; characterized in that the method further comprises: /c/ determining a first maximal correlation between: - a first vector of the seismic values associated with at least a point of the seismic image, said at least one point having a distance to the center point below the predetermined distance and said at least one point being on a first line, said plane comprising said first line, said seismic values being associated with said first line, and - a second vector of the seismic values associated with points of the first connected set of points and said points being on a second line parallel to the first line, the second vector being shifted by a plurality of shifting distances; - a first vector of the seismic values associated with at least a point of the seismic image, said at least one point having a distance to the center point below the predetermined distance and said at least one point being on a first line, said plane comprising said first line, said seismic values being associated with said first line, and - a second vector of the seismic values associated with points of the first connected set of points and said points being on a second line parallel to the first line, the second vector being shifted by a plurality of shifting distances; /d/ determining a second maximal correlation between: - the first vector, and - a third vector of the seismic values associated with points of the second connected set of points and said points being on a third line parallel to the first line, the third vector being shifted by a plurality of shifting distances; - the first vector, and - a third vector of the seismic values associated with points of the second connected set of points and said points being on a third line parallel to the first line, the third vector being shifted by a plurality of shifting distances; /e/ determining a difference value based on at least a difference between the first maximal correlation and the second maximal correlation.