Zhang Fengjun

Shape Filling Rate for Silhouette Representation and Recognition

Research on complex shape recognition showed that the shape context algorithm is sensitive to relative position variation of articulation. Aimed at this problem, a shape recognition method is proposed based on local shape filling rate of various object silhouettes. We take each landmark point as a circle center and use as its radius. Then, under a particular radius, the ratio between the covered silhouette pixels and the total pixels is defined as local shape filling rate. Thus, different radius may form different local shape filling rates. All landmark points with different radius will constitute a characteristic matrix which can effectively reflects the entire statistical property of the object shape. Experiments on a variety of shape databases show that the novel method is insensitive to articulation and less influenced by the number of landmark points, so our algorithm has strong power in describing object details.

A survey on human-computer interaction in virtual reality

Human computer interaction is one of the core technologies of virtual reality, which has an important significance on promoting the widely use of virtual reality and improving the user experience. Due to the development of various sensors and hardwares, human computer interaction technology in virtual reality has made remarkable progress. This paper firstly introduces the paradigm of human computer interaction in virtual reality, and then makes a summary about the main research contents and development trends of various virtual reality and augmented reality technologies, including 3D interaction, hand gesture interaction, handheld devices interaction, speech interaction, haptic interaction and multimodal interaction. Finally, the paper proposes some existing problems that need to be further studied.