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The question that how to increase the density and the accuracy of image matching in stereoscopic vision has become a hotspot and difficulty of research. A kind of combination coding scheme, which is based on the projection of fringes of Gray code and sine displacement, is proposed in this paper. In this way, the image matching is carried out by means of center line decoding method, which results in removing of decoding error derived in Gray code method, and avoiding of the phase expanding error generated in absolute phase based image matching. Due to the fact that the displacement step is not restricted by the period of the fringe, the matching density of image sample points can be increased significantly. The projecting of combination fringes of two orthogonal directions achieves the goal of global uniquely coding within the whole view field, which is taken as the matching factor to search the corresponding sample points. Measuring experiments of a number of target objects with various sizes and shapes indicate the validity of the method proposed.