Increasing the Accuracy of the Space-Sweeping Approach to Stereo Reconstruction, using Spherical Backprojection Surfaces

In this paper, interest is focused on the accurate and time-efficient stereo reconstruction, for the purpose of generating 3D animated scenes from multiple synchronized videos. The plane-sweeping approach is reviewed as relevant to the goal of time-efficiency, since its execution can be optimized on a GPU. A method compatible for optimization on the GPU is proposed as a more accurate alternative to plane sweeping and to the derived visibility computation. The method is compared to plane sweeping as to its accuracy, by evaluating the backprojected 3D model against independent views and using n-fold cross validation to estimate the peak signal to noise ratio (PSNR). Finally, the method´s output is casted integratable with multicamera stereo reconstruction frameworks.