Patent ID: 8723819

Claim:
A method for analyzing a two-dimensional track to generate at least one non-linear index, comprising: A 1 : extracting a two-dimensional track, wherein the two-dimensional track is a two-dimensional coordinate position sequenced along with time; A 2 : generating a plurality of displacement units in sequence according to the two-dimensional track, wherein each displacement unit comprises a displacement amount and a displacement direction of the two-dimensional track moving in a preset time interval; A 3 : comparing the displacement amount of each displacement unit with a reference value in sequence; and calculating an included angle formed between the displacement direction of the displacement unit and a displacement direction of a previous displacement unit, when the displacement amount of the displacement unit is greater than the reference value; A 4 : accumulating the included angles in sequence to obtain an accumulated angle, wherein the accumulated angle comprises an accumulated value and a positive or negative sign; and A 5 : converting the accumulated angle to at least one non-linear index.