Foreground detection method based on motion vector division

The present invention provides a foreground detection method based on motion vector division, characterized in that discrete motion vectors are used for dividing a movement trend to perform foreground detection, when the movement trend of a foreground and the movement trend of a background are distinguished, dense optical flow is used as a distinguishing basis, quantitative processing is performed for a calculated optical flow field to obtain a discrete motion vector matrix, then directional division is performed for the matrix, and connected domains are searched finally, so as to find a foreground object of which motion direction or speed is different from the motion direction or speed of the background, thereby completing a search process for the foreground object. A continuous vector quantification method and a division method in the present invention can well perform analysis processing for an optical flow vector field. The foreground detection method of the present invention which obtains the foreground object through comparison of the areas of the connected domains is a method for quickly capturing the position of the foreground in the case of uncertain foreground object.