The nonlinear calibration for camera was applied to two view-point 3D reconstruct system using vanishing-point. The image features of a free-form surface were enhanced by means of projecting arrays of dots. An array coded algorithm of direction and distance restricted was presented for projecting dots. First

get an original matching point and four original matching directions automatically according to the positions of red points. Then

all other white dots viewed both in two images can be coded by the proposed method and the images in two directions can be matched automatically. The experiments of 3D measurement and reconstruction of plaster model indicated that a sub-pixel precision can be got by using the algorithm of nonlinear vanishing-point calibration and the array code method based on direction and distance restricted can coding the projective point on picture rightly and can performs matching effectively between two images.