Efficient opacity specification based on feature visibilities in direct volume rendering

	Efficient opacity specification based on feature visibilities in direct volume rendering
	Wang, Yunhai; Zhang, Jian; Chen, Wei; Zhang, Huai; Chi, Xuebin
刊名	COMPUTER GRAPHICS FORUM
	2011
卷号	30 期号:7 页码:2117-2126
英文摘要	Due to 3D occlusion, the specification of proper opacities in direct volume rendering is a time-consuming and unintuitive process. The visibility histograms introduced by Correa and Ma reflect the effect of occlusion by measuring the influence of each sample in the histogram to the rendered image. However, the visibilityis defined on individual samples, while volume exploration focuses on conveying the spatial relationships between features. Moreover, the high computational cost and large memory requirement limits its application in multi-dimensional transfer function design. In this paper, we extend visibility histograms to feature visibility, which measures the contribution of each feature in the rendered image. Compared to visibility histograms, it has two distinctive advantages for opacityspecification. First, the user can directly specify the visibilities for features and the opacities are automatically generated using an optimization algorithm. Second, its calculation requires only one rendering pass with no additional memory requirement. This feature visibility based opacity specification is fast and compatible with all types of transfer function design. Furthermore, we introduce a two-step volume exploration scheme, in which an automatic optimization is first performed to provide a clear illustration of the spatial relationship and then the user adjusts the visibilities directly to achieve the desired feature enhancement. The effectiveness of this scheme is demonstrated by experimental results on several volumetric datasets. © 2011 The Author(s).(22 refs)
收录类别	SCI
原文出处	http://onlinelibrary.wiley.com/doi/10.1111/j.1467-8659.2011.02045.x/pdf
语种	英语
内容类型	期刊论文
源URL	[http://ir.siat.ac.cn:8080/handle/172644/3571]
专题	深圳先进技术研究院_数字所
作者单位	COMPUTER GRAPHICS FORUM
推荐引用方式 GB/T 7714	Wang, Yunhai,Zhang, Jian,Chen, Wei,et al. Efficient opacity specification based on feature visibilities in direct volume rendering[J]. COMPUTER GRAPHICS FORUM,2011,30(7):2117-2126.
APA	Wang, Yunhai,Zhang, Jian,Chen, Wei,Zhang, Huai,&Chi, Xuebin.(2011).Efficient opacity specification based on feature visibilities in direct volume rendering.COMPUTER GRAPHICS FORUM,30(7),2117-2126.
MLA	Wang, Yunhai,et al."Efficient opacity specification based on feature visibilities in direct volume rendering".COMPUTER GRAPHICS FORUM 30.7(2011):2117-2126.