Patent ID: 8206221
Filing Date: 2012-06-26
Classification: A63F

Abstract:
1. A method for coordinate generation to be implemented using an orientation device that is provided with a sensor, said method comprising the steps of: A) providing at least four reference marks on a target; B) aiming the orientation device at a target point on the target, and operating the orientation device such that the sensor is able to capture an image of the target that contains the reference marks; C1) computing coordinates of the reference marks in the image captured in step B) to obtain vector combinations; C2) from the vector combinations, finding a pair of vectors having a largest absolute value of vector inner product compared to those of the other vector pairs in the vector combinations, and obtaining absolute coordinates of the reference marks projected onto the coordinate space of the target according to the pair of vectors having the largest absolute value of vector inner product; D1) performing projective transformation calculations upon the absolute coordinates of the reference marks assigned in step C2) to obtain a transformation matrix; D2) correcting an image-capturing axis of the sensor of the orientation device with reference to the transformation matrix obtained in sub-step D1); and D3) determining the relative coordinates of the target point with reference to the corrected image-capturing axis.