In order to analyze on vehicle target from the surveillance video quickly and accurately

vehicle target extraction method based on region of interest（ ROI） area is proposed. Aiming at highway surveillance video

use Gaussian mixture background for modeling

draw ROI area invideo

to eliminate the influence of the reverse drive vehicle target

by method of image morphology for eliminating interference points and image contour cavity filling

after detecting vehicle moving target automatically intercept target with minimum rectangular box method

and finally build vehicles sample database by normalized image scale

provide target image for vehicle classification and recognition. The experimental results show that extraction accuracy of vehicle target by the method is high

and be able to rich the image database sample.