METHOD OF CORRELATING IMAGES

摘要

Independent figure elements (12, 13) in an object image (11) are correlated with a reference image (Fig. 3). Both images include independent elements (12, 13, 22, 23) which are not interlinked with each other. The method comprises defining a relative coordinate system (X min , Y min ) in an image plane for the reference image (Fig. 3) and the object image (11) on the basis of centers of gravity of two distinctive independent elements (12, 13) which are identified with values indicative of features such the perimeter and area of the elements; and collating pairs of independent elements between the reference image and the object image on the basis of the relative coordinate system (X min , Y min ). The object image (11) is initially formed in the field of view of a video camera, the independent figure elements (such as 12, 13) being thereby located in the coordinate system (X, Y) of the camera field of view, and therefore not necessarily in the same positions in the system (X, Y) as corresponding independent figure elements of a stored reference image.