Patent ID: 8073584

Claim:
A method of measuring dynamic parameters of an aircraft progressing over an airport zone including a runway, said method comprising: calculating the polar coordinates (r,Î¸) of a first straight line supporting a direction of center line, in an acquired image, wherein the calculation of the polar coordinates (r,Î¸) of the first straight line comprises the following steps: detecting straight lines in an acquired image, grouping said straight lines into sets according to directions of said straight lines, if several sets of different directions are created, choosing a direction to be followed by the aircraft and calculating the coordinates of a straight line supporting said direction in a first image reference frame, and calculating an angular deviation XTK between said first straight line and a second straight line supporting the direction of a current trajectory of the aircraft and calculating a lateral deviation XTE between the first straight line and the second straight line, wherein the step of detecting the straight lines comprises the following steps: calculating a black and white binary image (I B ) containing solely the contours of the acquired image (I), applying an algorithm for extracting lines to the black and white binary image (I B ), making it possible to obtain a third grey level image (I H ), estimating a number of straight lines (n) to be detected in the black and white binary image (I B ), searching for local maxima in the third image (I H ), and determining the straight lines exhibiting the largest probability of occurrence in the black and white binary image (I B ), on the basis of the local maxima of the third image (I H ).