Animated mesh simplification based on motion features in visual sensor networks

Hongjie Yang,Shujin Lin,Fan Zhou,Mouguang Lin,Ge Lin

doi:10.1177/1550147718822458

Hongjie Yang, Shujin Lin + Show 3 more

Open Access

https://doi.org/10.1177/1550147718822458

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Abstract

The three-dimensional animated model is widely used in scientific visualization, entertainment, and virtual applications, especially in visual sensor networks. The main purpose of simplification is to capture the shape sequence of an object with very few elements while preserving the overall shape. As three-dimensional animated mesh is time-varying in all frames, the trade-off between the temporal coherence and geometric distortion must be considered to develop simplification algorithm. In this article, a novel three-dimensional animated mesh simplification algorithm based on motion features is presented. Here, motion features are the connection areas of the relative movement consisted of vertices and edges. Motion feature extraction is to find a subgraph that has movement property. Dihedral angle of the edge through all frames is used to determine whether an edge is connected or not to the movement parts. Then, a rotation connected graph is defined to extract motion features. Traveling this graph, all motion features can be extracted. Based on the motion features, animated quadric error metric is created and quadric error matrix is built through all frames. Compared with the other methods, the important advantages of this method are high-efficiency simplification process and smoother simplification effects. It is suitable to be used in real-time applications. Experiment results show that the 3D animated mesh simplification effects by our method are satisfactory.

Highlights

With the development of computer technologies, the mobile platform based on network and communication has been applied rapidly in different areas
We present a novel 3D animated mesh simplification algorithm based on motion features
In the algorithm animated quadric error metric (AQEM), quadric error matrix is built through all frames, and the motion features are added as weights

Summary

Introduction

With the development of computer technologies, the mobile platform based on network and communication has been applied rapidly in different areas. Since the 3D animated mesh data are temporal coherence, traditional simplification methods cannot be directly applied to animated models.[2] Otherwise, it can involve the unpleasant visual artifact, causing the surface to vibrate and twitch. Compared with a single static mesh, for time-varying meshes, the problem of simplification is still a significant problem.[2,14] The 3D animated meshes are generally represented as over-sampled triangular meshes with a static connectivity, involving a large number of unnecessary details for some frames. We present a novel 3D animated mesh simplification algorithm based on motion features. A new weighted QEM for animated meshes is built. A new concept about motion features to protect the valuable part on the animated model during simplification process; 2. We present our new simplification algorithm and motion feature calculation method.

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Results

Conclusion