DETECTION OF EDGES IN AN IMAGE

摘要

A system locates an edge of an object in a two-or three dimensional image, in particular a medical image. Through an input (310) a set of data elements is received representing values of elements of the image. The data set is stored in a storage (320). A processor (340) determines the edge of an object in the image. It calculates at least a first­ and/or second-order derivative of the data elements and isophote curvatures for the image identified by ?. It also determines a correction factor a that corrects for dislocation of an edge caused by curvature of an object and/or blurring of the data. The correction factor a depends on the isophote curvature ?. The processor then determines a zero crossing of an operator that depends on the calculated derivative and the isophote curvature. An output (330) of the system provides an indication of a location of an edge in the image.