1. A method for extracting feature data of dynamic objects, being performed by execution of computer readable program code by at least one processor of at least one computer system, the method comprising: (a) reading each frame of a video file; (b) selecting sequential N frames of the video file, wherein N is a positive integer; (c) dividing each of the N frames into N*N squares; (d) selecting any n frames from the N frames, wherein n is a positive integer; (e) selecting any n rows and n columns of the n frames to obtain n*n*n squares; (f) reading pixel values of the n*n*n squares; and (g) computing averages and differences for the pixel values of the n*n*n squares using predetermined formulas, wherein the averages and differences are feature data extracted from the video file.