Patent ID: 6300974
Filing Date: 2001-10-09
Classification: G01V,G06K,G06T

Abstract:
Process for positioning an object (1) carrying marks (3) in space, consisting of determining the positions of traces (13) of marks (3) on an image (10) taken with a camera (4), and then calculating the positions of the marks (3) with respect to the camera (4) using the positions of the traces (13) on the image (4), characterized in that it comprises a step to improve the determination of the positions of the traces (13) on the image (10) by modeling the traces (13) using predetermined geometric shape functions and calculating the positions of the shape function that best correspond to the traces, the correspondence being calculated by minimizing a difference in light intensity on the image between the trace (13) and the geometric shape function, the predetermined geometric shape function including variable parameters for taking account of deformation and dimension of aspects of the marks (3) due to distance and rotation of the object (1), the geometric shape function including a gaussian function with variable parameters for modeling the light intensity within the shape function.