Patent ID: 6304298
Filing Date: 2001-10-16
Classification: H04N

Abstract:
A method of determining the position of a TV camera relative to a patterned panel, comprising a pattern of vertical and horizontal straight lines that delineate a color difference, being viewed by the TV camera, comprising:identifying a plurality of edge points, which are each disposed on one of said horizontal or vertical straight lines, from a video signal of the patterned panel produced by said camera;using these edge points to calculate a perspective of the patterned panel relative to the camera, comprising(i) clustering the plurality of edge points to associate edge points and to specific lines using a slope and intercept process;(ii) analyzing all identified edge points and grouping at least some of the identified edge points into a first group that corresponds to the horizontal lines and a second group that corresponds to the vertical lines;(iii) allocating the first and second groups to specific horizontal and vertical lines;(iv) computing vanishing points of the specific horizontal and vertical lines, said vanishing points being computed within a defined location error and projecting the edge points that were allocated to specific horizontal lines from the computed vanishing point of the horizontal lines to obtain an edge projection profile map comprising peaks and troughs;and determining a relative position of the camera relative to the patterned panel by reference to the perspective of the patterned panel.