MOBILE OBJECT DETECTION DEVICE AND SIMILARITY/DISSIMILARITY DETERMINATION METHOD FOR PIXEL

摘要

PROBLEM TO BE SOLVED: To to accurately detect a mobile object while reducing an arithmetic processing load.;SOLUTION: Input images to be time-sequentially and continuously given in frame units are compared with a preliminarily prepared background image for each pixel unit. A pixel value (r, g, b) of the pixel under consideration of the input image and a pixel value (R, G, B) of the corresponding pixel of the background image are plotted on a three-dimensional color space, and a point q(r, g, b) and a point Q(R, G, B) are defined. When a distance between an origin O and the point Q is defined as D, an ellipse having a major axis radius α=h×D(h1) and a minor axis radius β=k×D(kh) is arranged with the point Q as a center so that a reference axis Z passing the two points O and Q becomes a major axis direction, and a spheroid E is defined by rotating the ellipse with the reference axis Z as a center. When the point q is present inside the spheroid E, a pixel under consideration is defined as a background region, and when the point q is outside the spheroid E, the pixel under consideration is defined as the pixel of a mobile object. The aggregate of the pixel of the mobile object is detected as the occupancy region of the mobile object on the input image. In this case, h is a parameter determining the major axis radius α of the spheroid E, and k is a parameter determining a minor axis radius β of the spheroid E.;COPYRIGHT: (C)2011,JPO&INPIT