  This paper proposes a novel block merging algorithm suitable for any
block-based 3D instance segmentation technique. The proposed work improves over
the state-of-the-art by allowing wrongly labelled points of already processed
blocks to be corrected through label propagation. By doing so, instance overlap
between blocks is not anymore necessary to produce the desirable results, which
is the main limitation of the current art. Our experiments show that the
proposed block merging algorithm significantly and consistently improves the
obtained accuracy for all evaluation metrics employed in literature, regardless
of the underlying network architecture.
