3D video super-resolution using fully convolutional neural networks
Large amount of redundant information and huge data size have been a serious problem for multiview video systems. To address this problem, one popular solution is mixed-resolution, where only few viewpoints are kept with full resolution and other views are kept with lower resolution. In this paper, we propose a super-resolution (SR) method, where the low-resolution viewpoints in the 3D video are up-sampled using a fully convolutional neural network. By simply projecting the neighboring high resolution image to the position of the low resolution image, we learn the relationship of high and low resolution patches, and reconstruct the low resolution images into high resolution ones using the projected image information. We propose to use a fully convolutional neural network to establish a mapping between those images. The network is barely trained on 17 pairs of multiview images, and tested on other multiview images and video sequences. It is observed that our proposed method outperforms existing methods objectively and subjectively, with more than 1 dB average gain achieved. Meanwhile, our network training procedure is efficient, with less than 3 hours using one Titan X GPU.