A novel radon based Ray-Space interpolation algorithm

Ray-space interpolation is one of the key technologies to make ray-space based FTV (Free Viewpoint Television) system feasible. Since ray-space data is composed of straight lines with different slopes, the problem in ray-space interpolation is to find the slope of the straight lines which tells us the interpolation direction. In this paper, a radon based ray-space interpolation algorithm is proposed. First, feature points of epipolar plane image (EPI) are extracted to form a feature EPI (FEPI). Then, radon transform is applied to FEPI to find the possible interpolation direction. Finally, a new cost function is proposed to improve the smoothness of disparity map and find the optimal interpolation direction. Experimental results show that both the performance and the robustness of the proposed algorithm are much higher than that of the traditional pixel matching based interpolation (PMI) and block matching based interpolation (BMI).