Learning 3D Shapes as Multi-Layered Height-maps using 2D Convolutional Networks

Kripasindhu Sarkar, Basavaraj Hampiholi, Kiran Varanasi, Didier Stricker

In: Computer Vision -- ECCV 2018 |. European Conference on Computer Vision (ECCV-2018) September 8-14 Munich Germany Springer International Publishing 2018.


We present a novel global representation of 3D shapes, suitable for the application of 2D CNNs. We represent 3D shapes as multi-layered height-maps (MLH) where at each grid location, we store multiple instances of height maps, thereby representing 3D shape detail that is hidden behind several layers of occlusion. We provide a novel view merging method for combining view dependent information (Eg. MLH descriptors) from multiple views. Because of the ability of using 2D CNNs, our method is highly memory efficient in terms of input resolution compared to the voxel based input. Together with MLH descriptors and our multi view merging we achieve the state-of-the-art result in classification on ModelNet dataset.

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German Research Center for Artificial Intelligence
Deutsches Forschungszentrum für Künstliche Intelligenz