Abstract: A model of three-dimensional reconstruction of license plate image is proposed in lack frame environment based on brightness space equalization smoothing and curve segmentation. According to the shortage of frame vehicle environmental external contour rectangular model, extract the occlusion vehicle line segmentation, spatial luminance equalization processing, for shielding plate curve segmentation of license plate image, and enhance the hue and saturation of 3D reconstruction. Through the enhancement of image contrast and interdiction, the high frequency signal, realize smooth image processing is taken, using the curve segmentation algorithm for image of two value segmentation, the impurity removal after segmentation of vehicle parts is obtained, get the vehicle area complete independence, realize the lack of 3D reconstruction of license plate image frame environment improvement.