WALKING CYCLE MEASURING DEVICE, PERIODIC IMAGE OBTAINING DEVICE, COMPRESSION PROCESSOR FOR MOVING OBJECT OUTLINE, AND MOVING OBJECT DISCRIMINATION SYSTEM

摘要

PPROBLEM TO BE SOLVED: To improve the accuracy in discriminating a moving object by utilizing the periodic motion of the moving object. PSOLUTION: This system comprises an image pick-up camera 1 which produces the image data of a moving object; a walk cycle extraction part 23 which produces the data of plural images having the moving object by calculating the difference between the data of plural images having no moving object and that of background images, and then obtains periodic images having periodic motion based on the data of the plural images it earlier produced; an outline extraction part 24 which calculates, based on the periodic images, the P expression vector consisting of a real part and an imaginary part of the complex function having, as the exponent of the exponential function, the curvature function that is expressed with the angle formed by the real axis and a vector between neighboring coordinates; a feature vector extraction part 25 which selects only real and imaginary parts of the complex value function expressing the feature parts of the moving object in relation to the P expression vector, and then compresses the data volume of the P expression vector; and an HMM model producing part 26 which identifies the moving object by applying hidden Markov model to the data-compressed P expression vector. PCOPYRIGHT: (C)2005,JPO&NCIPI