Patent ID: 7068814

Claim:
A visual tracking method using color information comprising: a three-dimensional color modeling step (S 100 ) in which the color model is constituted by four quadratic functions representing average and standard deviation of target hue and average and standard deviation of target saturation, wherein said color model for the whole region is accomplished by dividing the whole region subject to image brightness changes into n regions with regular sizes and by approximating each region using a quadratic curve and making the four quadratic functions constitute a single Gaussian function; a target recognition step (S 200 ) in which judgement is made based on the difference between the previous and the current images about whether or not a new target object appears, a target region is located by applying the color model in said three-dimensional color modeling step (S 100 ), and the final decision is made as to whether or not visual tracking is to be performed for the target depending on the shape analysis of the target region; and a step of visual tracking (S 300 ) in which an arbitrary pixel is monitored and judged using said color model if it belongs to the target region and at the same time the judgement process is adapted to the movement speed of the target by estimating the movement of the target region.