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Angela Dai, Charles Ruizhongtai Qi, Matthias Nießner. Shape Completion using 3D-Encoder-Predictor CNNs and Shape Synthesis. CoRR, 2016.

Dai et al. use a 3D convolutional neural network architecture called 3D-Encoder-Predictor Network for shape completion. Figure 1 illustrates the high-level pipeline. The first step consists of two networks which are combined in the framework of their 3D Encoder-Preodictor Network as illustrated in Figure 2. The input is a two channel volume encoding the signed truncated distance function (STDF) and the output is only a distance function (DF). Nearest neighbors of the output shape (in resolution $32^3$) are searched utilizing features taken from a 3D classification network following []. Finally, the output volume and the nearest neighbor shapes are used to produce a higher-resolution mesh ($128^3$), see the paper for details.

Figure 1 (click to enlarge): High-level illustration of the proposed approach as described in the text.

Figure 2 (click to enlarge): The network architecture used for shape completion.

  • [] C. R. Qi, H. Su, M. Nießner, A. Dai, M. Yan, and L. Guibas. Volumetric and multi-view cnns for object classification on 3D data. In Proc. Computer Vision and Pattern Recognition (CVPR), 2016.

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