An Efficient Linearisation Approach for Variational Perspective Shape from Shading
An Efficient Linearisation Approach for Variational Perspective Shape from Shading
复制标题
一种用于阴影变化透视形状的有效线性化方法
DOI:
10.1007/978-3-319-24947-6_20
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发表时间:
2015
期刊:
影响因子:
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通讯作者:
A. Bruhn
中科院分区:
文献类型:
--
作者:
D. Maurer;Y.-C. Ju;M. Breuß;A. Bruhn
Recently, variational methods have become increasingly more popular for perspective shape from shading due to their robustness under noise and missing information. So far, however, due to the strong nonlinearity of the data term, existing numerical schemes for minimising the corresponding energy functionals were restricted to simple explicit schemes that require thousands or even millions of iterations to provide accurate results. In this paper we tackle the problem by proposing an efficient linearisation approach for the recent variational model of Juet al.[14]. By embedding such a linearisation in a coarse-to-fine Gauß-Newton scheme, we show that we can reduce the runtime by more than three orders of magnitude without degrading the quality of results. Hence, it is not only possible to apply variational methods for perspective SfS to significantly larger image sizes. Our approach also allows a practical choice of the regularisation parameter so that noise can be suppressed efficiently at the same time.
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DOI:
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发表时间:
2004
期刊:
Proceedings of the 17th International Conference on Pattern Recognition, 2004. ICPR 2004.
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