Patent Document ID: 8144946
Application ID: 12524765
Patent Status: 1

Claim One:
1. A method ( 10 ) for identifying symbolic points on the image of a face ( 1 ), said image comprising a priori the images of a right eye, of a left eye and of a mouth, said method successively comprising the steps of: a) detecting ( 11 ) elements ( 2 a , 2 b , 3 a , 3 b , 4 ) with strong contrasts of the face and identifying said elements with strong contrasts; b) selecting ( 12 ) at least one zone ( 20 a , 20 b , 40 ) of the image, said at least one zone having a position and dimensions on the image ( 1 ) that are determined with respect to the elements with strong contrasts ( 2 a , 2 b , 3 a , 3 b , 4 ) and such that it contains a priori two sought-after symbolic points interrelated by a morphological criterion; c) searching ( 13 ) for points defined by the convergence of separation lines of contrasted zones of the image, termed natural points, in said at least one zone; d) determining ( 14 ) a signature for each of said natural points by calculating the gradient of the image contrast around the natural point; e) determining ( 15 a ) for each natural point at least one score characterizing a resemblance of the signature of the point with respect to pre-established signatures of symbolic points and selecting ( 15 b ) the natural points having a score above a threshold value; f) from among the natural points of the at least one zone whose scores are above a threshold value, identifying ( 16 ) pairs of natural points, each pair being determined by a first natural point and by a second natural point whose relative position in the zone considered with respect to the first natural point corresponds to a position close to pre-established relative positions of pairs of standard symbolic points searched for in said at least one zone and determining for each identified pair a score characteristic of the deviation of the pair considered with respect to the pairs of standard symbolic points; g) in the at least one zone, selecting ( 17 ) the pair of natural points having the best score as symbolic points of said at least one zone considered of the image of the face ( 1 ).