A fast and low-cost method of acquiring 3D point cloud data is proposed in this paper, which can solve the problems of lack of texture information and low efficiency of acquiring point cloud data with only one pair of...
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ISBN:
(纸本)9781510617223;9781510617216
A fast and low-cost method of acquiring 3D point cloud data is proposed in this paper, which can solve the problems of lack of texture information and low efficiency of acquiring point cloud data with only one pair of cheap cameras and projector. Firstly, we put forward a scene adaptive design method of random encoding pattern, that is, a coding pattern is projected onto the target surface in order to form texture information, which is favorable for image matching. Subsequently, we design an efficient dense matching algorithm that fits the projected texture. After the optimization of global algorithm and multi-kernel parallel development with the fusion of hardware and software, a fast acquisition system of point-cloud data is accomplished. Through the evaluation of point cloud accuracy, the results show that point cloud acquired by the method proposed in this paper has higher precision. What's more, the scanning speed meets the demand of dynamic occasion and has better practical application value.
Diskless checkpointing is an effective solution to avoid the I/O bottleneck in disk-based checkpointing for tolerating a small number of node failures in large distributed systems. However, the existing encoding schem...
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ISBN:
(纸本)9781538625880
Diskless checkpointing is an effective solution to avoid the I/O bottleneck in disk-based checkpointing for tolerating a small number of node failures in large distributed systems. However, the existing encoding schemes used by diskless checkpointing lead to high communication overheads because of cross node encoding. This negates the advantages of diskless checkpointing, especially in scenarios with a limited network bandwidth. This paper proposes a diskless checkpointing scheme with vertical encoding to address this problem. Vertical encoding eliminates the dependency among nodes and also facilitates a balanced communication. Moreover, an analysis model is developed to obtain an optimal configuration parameter. Experimental results show that the proposed scheme reduces significantly the communication overhead of both checkpointing and fault recovery, with no encoding overhead introduced.
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